Expand
Contents
- The climate of Belfast
- The best time to visit Belfast
- The worst time to visit Belfast
- Spring weather in Belfast
- Summer weather in Belfast
- Autumn weather in Belfast
- Winter weather in Belfast
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average sea temperature
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The Northern Ireland City Hall located in Belfast, United Kingdom
The climate of Belfast
Belfast, United Kingdom, falls under the Marine west coast, warm summer category according to the Köppen climate classification (Cfb). The city's location on the northeast coast of Ireland affords it mild summers and cool winters, with the region's climate largely being shaped by the maritime influences of the North Atlantic Current. Throughout the year, temperatures range from 3.1°C (37.6°F) to 16.9°C (62.4°F) on average, accompanied by consistent humidity levels fluctuating between 83% to 88%.
While the city avoids temperature extremes, rainfall remains a significant factor in Belfast's climate. Cumulative precipitation per month varies from 38mm (1.5") to 72mm (2.83"). This rainfall is relatively evenly distributed across the year with a slight peak in August at 72mm (2.83"). On the contrary, February presents marginally the lowest rainfall at 45mm (1.77"). The number of rainy days per month also sees little variation, with an average of around 18 days, rising slightly to a maximum of 23 days in August.
Moreover, snowfall is not a severe feature of the climate. Snowfall accumulation varies from a negligeble amount of around 2mm (0.08") to 25mm (0.98") in February, with the number of snowfall days not exceeding 2.8 days per month. As it is customary for marine climates, temperature levels in the surrounding sea directly influence weather conditions on land. The sea temperatures vary from 8°C (46.4°F) to 14.3°C (57.7°F), with the warmer months ranging from July to September.
The daylight duration fluctuates considerably across the year, from a low of 7.4 hours in December to a high of 17.2 hours in June. Correspondingly, the amount of sunshine varies as well, from 3.5 hours in February to 7.3 hours in June. It is noteworthy that Belfast's conditions include a level of cloudiness, with a 55% to 63% cloud cover throughout the year, which results in a reduced amount of sunshine in some months.
While the city avoids temperature extremes, rainfall remains a significant factor in Belfast's climate. Cumulative precipitation per month varies from 38mm (1.5") to 72mm (2.83"). This rainfall is relatively evenly distributed across the year with a slight peak in August at 72mm (2.83"). On the contrary, February presents marginally the lowest rainfall at 45mm (1.77"). The number of rainy days per month also sees little variation, with an average of around 18 days, rising slightly to a maximum of 23 days in August.
Moreover, snowfall is not a severe feature of the climate. Snowfall accumulation varies from a negligeble amount of around 2mm (0.08") to 25mm (0.98") in February, with the number of snowfall days not exceeding 2.8 days per month. As it is customary for marine climates, temperature levels in the surrounding sea directly influence weather conditions on land. The sea temperatures vary from 8°C (46.4°F) to 14.3°C (57.7°F), with the warmer months ranging from July to September.
The daylight duration fluctuates considerably across the year, from a low of 7.4 hours in December to a high of 17.2 hours in June. Correspondingly, the amount of sunshine varies as well, from 3.5 hours in February to 7.3 hours in June. It is noteworthy that Belfast's conditions include a level of cloudiness, with a 55% to 63% cloud cover throughout the year, which results in a reduced amount of sunshine in some months.
The best time to visit Belfast
Considering the weather data, the ideal time for a visit would be between June and September. During this period, temperatures are relatively warm, ranging from 13.3°C (55.9°F) to 16.9°C (62.4°F), and the threat of heavy rainfall is minimized. Sea temperature also increases up to 14.3°C (57.7°F), which enhances coastal activities. Additionally, the duration of daylight peaks at an impressive 17.2 hours in June, providing long, sunny days for outdoor exploration.
The worst time to visit Belfast
Based on weather variance, travelers might consider avoiding the months of January and February. These months experience the coldest temperatures, ranging between 3.1°C (37.6°F) and 7.1°C (44.8°F). Furthermore, February endures both the maximum recorded snowfall of 25mm (0.98") and the shortest daylight hours at 8 hours, resulting in a propensity for gloomier and chillier conditions.
Spring weather in Belfast
In Spring, from March to May, weather conditions evolve progressively. Temperatures elevate from 3.2°C (37.8°F) to 7.1°C (44.8°F) and rainfall fluctuates from 48mm (1.89") in March to 38mm (1.5") in May. Correspondingly, the number of daylight hours increases dramatically from 11.9 hours in March to 16.1 hours in May.
Summer weather in Belfast
From June to August, summer in Belfast brings the warmest temperatures, ranging from 9.5°C (49.1°F) to 16.9°C (62.4°F). Rainfall increases slightly in July and August, reaching up to 72mm (2.83"). Nevertheless, the number of daylight hours remains the longest during the year, peaking at 17.2 hours in June.
Autumn weather in Belfast
During Autumn months, September to November, temperatures start to cool off, ranging from 5.6°C (42.1°F) to 14.8°C (58.6°F). Rainfall is also on the rise, peaking at 66mm (2.6") in November. Daylight hours begin to shrink rapidly, dropping from 12.7 hours in September to 8.5 hours in November.
Winter weather in Belfast
Winter falls between December and February in Belfast, with temperatures typically varying from 3.1°C (37.6°F) to 7.1°C (44.8°F). Although December is the wettest month with 66mm (2.6") of rain, snowfall is not prominent, with only a couple of days of notable snowfall in January and February. Daylight hours are minimal, ranging from 7.4 hours in December to 9.8 hours in February.
Weather in January
January experiences the coldest temperatures compared to the following months in Belfast, United Kingdom, with a swing from 3.1°C (37.6°F) to 6.8°C (44.2°F). It frequently exhibits a damp and cloudy environment due to high moisture content, represented by an 88% relative humidity. Weather in January »
Weather in February
Belfast witnesses a slight rise in temperatures in February, with cooler conditions prevailing compared to the upcoming spring in March. A notable feature for this month is the significant snowfall of 25mm (0.98") over 2.8 days, surpassing all other months in terms of both volume and duration. Weather in February »
Weather in March
By the time March arrives in Belfast, temperatures begin to nudge further upwards, instigating the onset of spring. There is lesser snowfall with only 4mm (0.16") falling over a minimal 1.2 days, indicating a definite shift away from winter. Weather in March »
Weather in April
April experiences a dramatic climatic shift in Belfast, with the temperature range hovering between 4.9°C (40.8°F) to 10.8°C (51.4°F). This month marks a turning point as no snowfall is recorded, signifying the definitive end of winter. Weather in April »
Weather in May
There is a noticeable jump in temperature in Belfast during May, creating a comfortable environment. This month boasts an increase in daylight hours, nearing their annual peak, which adds vibrancy to the city. High relative humidity persists, contributing to the occasional misty mornings and noteworthy precipitation. Weather in May »
Weather in June
June in Belfast introduces the summer with the warmest temperature trend until this point. This month witnesses the longest daylight duration of the year, welcoming the summer solstice. The significant increase in temperature is also reflected in sea, making the coastal areas delightful for visitors. Weather in June »
Weather in July
July is characterized by the warmest month of the year in Belfast with temperatures peaking to 16.9°C (62.4°F). It invites a plethora of outdoor activities due to its extended daylight hours contributing to the lively summer spirit. Weather in July »
Weather in August
August maintains similar temperatures to July in Belfast, representing the city's peak summer season. The sea temperatures reach an annual peak making it an ideal time for water enthusiasts. Despite being the heart of summer, rainfall also exhibits a yearly high of 72mm (2.83"), indicating a wet summer. Weather in August »
Weather in September
In September, Belfast's weather conditions start to cool off compared to the preceding summer months. Despite the transition to autumn, sea temperatures are still relatively higher, making water activities plausible. The days continue to shorten as autumn approaches, yet sufficient daylight hours render the days pleasant. Weather in September »
Weather in October
October in Belfast witnesses a substantial drop in temperatures indicating the onset of autumn. The daylight hours decrease significantly, offering less time for outdoor activities. Nevertheless, the sea temperature takes a slow decline, surprisingly sustaining water-related activities. Weather in October »
Weather in November
November manifests as even cooler compared to October, emphasizing the transition from autumn to winter. This month presents the unique occurrence of minimal snowfall, earmarking the first winter signs in Belfast. The diminishing daylight hours bring longer evenings, ushering in winter's soul. Weather in November »
Weather in December
December brings the coldest climatic conditions next to January in Belfast, declaring the winter commencement. It registers a marginal snowfall of 6mm (0.24") over 1.2 days, contributing to the wintry landscape. Daylight hours reach the annual low contributing to longer, colder nights. Weather in December »
[Resources]Frequently asked questions
What part of the year is the coldest in Belfast?
In Belfast, January registers the lowest temperatures, averaging 6.8°C (44.2°F) at the peak and 3.1°C (37.6°F) at the lowest.
What is the most humid month in Belfast?
January and December, with an average relative humidity of 88%, are most humid months in Belfast.
How much does it rain in Belfast?
Throughout the year, there are 220.2 rainfall days, and 626mm (24.65") of precipitation is accumulated.
When does it snow in Belfast?
January through March, November and December are months with snowfall.
How much does it snow in Belfast?
In Belfast, during the entire year, snow falls for 8.2 days and aggregates up to 47mm (1.85") of snow.
When is the lowest UV index in Belfast?
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.
What is the snowiest month in Belfast?
February is the month with the most snowfall. Snow falls for 2.8 days and accumulates 25mm (0.98") of snow.
What is the month with the least sunshine in Belfast?
February has the least sunshine of the year, with an average of 3.5h of sunshine.
When is the sea coldest in Belfast?
March is the month with the coldest seawater in Belfast, with an average sea temperature of 8°C (46.4°F).
What is the least humid month in Belfast?
April and May, with an average relative humidity of 83%, are the least humid months in Belfast.
When it does not snow in Belfast?
April through October are months without snowfall.
What is the driest month in Belfast?
May is the month with the least rainfall in Belfast. Rain falls for 17.8 days and accumulates 38mm (1.5") of precipitation.
What are the months with the highest UV index in Belfast?
The months with the highest UV index in Belfast are May through August, with an average maximum UV index of 4.
When are the longest days in Belfast?
June has the longest days of the year, with an average of 17h and 12min of daylight.
What month has the most sunshine in Belfast?
June has the most sunshine of the year, with an average of 7.3h of sunshine.
What part of the year is the hottest in Belfast?
Belfast, United Kingdom, records the warmest temperatures in July, averaging a high of 16.9°C (62.4°F) and a low of 11.2°C (52.2°F).
What is the rainiest month in Belfast?
The month with the most rainfall in Belfast is August, when the rain falls for 23 days and typically aggregates up to 72mm (2.83") of precipitation.
What month is the sea warmest in Belfast?
The month with the warmest seawater in Belfast, United Kingdom, is September, with an average sea temperature of 14.3°C (57.7°F).
When is Daylight Saving Time (DST) in Belfast?
On Sunday, 27. October 2024, at 2:00 am, Daylight Saving Time ends in Belfast, and the time zone changes from BST to GMT. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 1:00 am, and the time zone reverts from GMT to BST.
What is the month with the shortest days in Belfast?
With an average of 7h and 24min of daylight, December has the shortest days of the year.
Average temperature
Belfast, United Kingdom
The warmest month (with the highest average high temperature) is July (16.9°C).
The month with the lowest average high temperature is January (6.8°C).
The month with the highest average low temperature is August (11.3°C).
The coldest month (with the lowest average low temperature) is February (2.8°C).
Average pressure
Belfast, United Kingdom
- Average pressure in January:
1009.9mbar - Average pressure in February:
1009.8mbar - Average pressure in March:
1013.2mbar - Average pressure in April:
1014.5mbar - Average pressure in May:
1015.6mbar - Average pressure in June:
1014.8mbar
- Average pressure in July:
1013.2mbar - Average pressure in August:
1011.8mbar - Average pressure in September:
1014.2mbar - Average pressure in October:
1011.9mbar - Average pressure in November:
1007.3mbar - Average pressure in December:
1009.3mbar
The month with the highest atmospheric pressure is May (1015.6mbar).
The month with the lowest atmospheric pressure is November (1007.3mbar).
Average wind speed
Belfast, United Kingdom
- Average wind speed in January:
21.3km/h - Average wind speed in February:
20.6km/h - Average wind speed in March:
18.6km/h - Average wind speed in April:
16.3km/h - Average wind speed in May:
15.8km/h - Average wind speed in June:
13.7km/h
- Average wind speed in July:
13.7km/h - Average wind speed in August:
15.3km/h - Average wind speed in September:
17km/h - Average wind speed in October:
18.2km/h - Average wind speed in November:
19.9km/h - Average wind speed in December:
21.2km/h
The windiest month (with the highest average wind speed) is January (21.3km/h).
The calmest months (with the lowest average wind speed) are June and July (13.7km/h).
Average humidity
Belfast, United Kingdom
The months with the highest relative humidity are January and December (88%).
The months with the lowest relative humidity are April and May (83%).
Average rainfall
Belfast, United Kingdom
The wettest month (with the highest rainfall) is August (72mm).
The driest month (with the least rainfall) is May (38mm).
Average rainfall days
Belfast, United Kingdom
- Average rainfall days in January:
18 days - Average rainfall days in February:
16.3 days - Average rainfall days in March:
17.9 days - Average rainfall days in April:
16.1 days - Average rainfall days in May:
17.8 days - Average rainfall days in June:
19.8 days
- Average rainfall days in July:
21.7 days - Average rainfall days in August:
23 days - Average rainfall days in September:
16.4 days - Average rainfall days in October:
17.8 days - Average rainfall days in November:
18.9 days - Average rainfall days in December:
16.5 days
The month with the highest number of rainy days is August (23 days).
The month with the least rainy days is April (16.1 days).
Average snowfall
Belfast, United Kingdom
The month with the highest snowfall is February (25mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days
Belfast, United Kingdom
- Average snowfall days in January:
2.5 days - Average snowfall days in February:
2.8 days - Average snowfall days in March:
1.2 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.5 days - Average snowfall days in December:
1.2 days
The month with the highest number of snowfall days is February (2.8 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature
Belfast, United Kingdom
The best month for swimming (with the highest average sea temperature) is September (14.3°C).
The coldest month (with the lowest average sea temperature) is March (8°C).
Average daylight / Average sunshine
Belfast, United Kingdom
- Average daylight in January:
8h and 0min - Average daylight in February:
9h and 4min - Average daylight in March:
11h and 5min - Average daylight in April:
14h and 1min - Average daylight in May:
16h and 1min - Average daylight in June:
17h and 1min
- Average daylight in July:
16h and 4min - Average daylight in August:
14h and 5min - Average daylight in September:
12h and 4min - Average daylight in October:
10h and 3min - Average daylight in November:
8h and 3min - Average daylight in December:
7h and 2min
The month with the longest days is June (Average daylight: 17h and 12min).
The month with the shortest days is December (Average daylight: 7h and 24min).
- Average sunshine in January:
3h and 4min - Average sunshine in February:
3h and 3min - Average sunshine in March:
4h and 5min - Average sunshine in April:
6h and 4min - Average sunshine in May:
6h and 4min - Average sunshine in June:
7h and 2min
- Average sunshine in July:
6h and 4min - Average sunshine in August:
6h and 2min - Average sunshine in September:
6h and 0min - Average sunshine in October:
3h and 5min - Average sunshine in November:
3h and 5min - Average sunshine in December:
4h and 1min
The month with the most sunshine is June (Average sunshine: 7h and 18min).
The month with the least sunshine is February (Average sunshine: 3h and 30min).
Average sunshine days
Belfast, United Kingdom
- Average sunshine days in January:
9.2 days - Average sunshine days in February:
7.6 days - Average sunshine days in March:
9.2 days - Average sunshine days in April:
11.5 days - Average sunshine days in May:
10.7 days - Average sunshine days in June:
7.6 days
- Average sunshine days in July:
6.6 days - Average sunshine days in August:
5.6 days - Average sunshine days in September:
8.4 days - Average sunshine days in October:
9 days - Average sunshine days in November:
7.3 days - Average sunshine days in December:
9.4 days
The month with the most sunshine days is April (11.5 days).
The month with the least sunshine days is August (5.6 days).
Average UV index
Belfast, United Kingdom
The months with the highest UV index are May, June, July and August (UV index 4).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover
Belfast, United Kingdom
The months with the most cloud cover are January and February (Cloud cover 63).
The month with the least cloud cover is April (Cloud cover 55).
Average visibility
Belfast, United Kingdom
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
Belfast, United Kingdom
Weather forecast for your location
1. Click Locate me button
2. Allow the app to use your location
2. Allow the app to use your location
