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Contents
- The climate of Swansea
- The best time to visit Swansea
- The worst time to visit Swansea
- Spring weather in Swansea
- Summer weather in Swansea
- Autumn weather in Swansea
- Winter weather in Swansea
- 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 rainfall
- Average rainfall days
- Average sea temperature
- Average daylight
- Average sunshine
- Average UV index
The climate of Swansea
Positioned in the United Kingdom, Swansea carries a typical marine west climate, known as Cfb under Köppen climate classification. This signifies a moderate, temperate climate characterized by a lack of weather extremes. Weather parameters consistently display moderate values throughout the year.
A noticeable feature of the Swansea climate is the balanced temperatures. The high averages fluctuate modestly from 7.8°C (46°F) to 19.7°C (67.5°F). A similar moderate pattern is seen in the low averages, oscillating from 3.6°C (38.5°F) to 14°C (57.2°F). Swansea benefits from a sea temperature that ranges from 8.3°C (46.9°F) to 16.8°C (62.2°F).
Regarding precipitation, Swansea exhibits substantial average rainfall from 59mm (2.32") to 123mm (4.84") monthly. The frequency of rainfall days ranges between 13 and 20 days per month, demonstrating consistently moist conditions.
Sunshine and daylight hours provide a contrasting picture. Daylight hours increase from 7.9 to 16.6hrs throughout the year, while sunshine hours mostly envelope between 2 to 7hrs per day.
A noticeable feature of the Swansea climate is the balanced temperatures. The high averages fluctuate modestly from 7.8°C (46°F) to 19.7°C (67.5°F). A similar moderate pattern is seen in the low averages, oscillating from 3.6°C (38.5°F) to 14°C (57.2°F). Swansea benefits from a sea temperature that ranges from 8.3°C (46.9°F) to 16.8°C (62.2°F).
Regarding precipitation, Swansea exhibits substantial average rainfall from 59mm (2.32") to 123mm (4.84") monthly. The frequency of rainfall days ranges between 13 and 20 days per month, demonstrating consistently moist conditions.
Sunshine and daylight hours provide a contrasting picture. Daylight hours increase from 7.9 to 16.6hrs throughout the year, while sunshine hours mostly envelope between 2 to 7hrs per day.
The best time to visit Swansea
Considering temperature comfort and reduced likelihood of rain, late spring or early summer emerges as an optimal period for a visit. Specifically, months of May and June provide an attractive balance. Temperatures climb towards the year's peak, averaging between 15°C (59°F) to 17.7°C (63.9°F). At the same time, rainfall decreases to around 64mm (2.52") over an average of 15 days, and sea temperature begins to warm, averaging around 13.7°C (56.7°F) in June. The amount of sunshine per day increases to seven hours, making these months pleasant for outdoor activities.
The worst time to visit Swansea
The months from October to December are deemed less desirable for visits. During these months, temperature averages for highs and lows drop to between 8.7°C (47.7°F) and 14.4°C (57.9°F), and from 4.7°C (40.5°F) to 9.9°C (49.8°F) respectively. Rainfall hits its peak, with average precipitation at a high of 110mm (4.33") to 123mm (4.84"), and as many as 19 to 20 rainy days per month. Additionally, the sea temperature cools down significantly, ranging from 13.5°C (56.3°F) to 11.1°C (52°F).
Spring weather in Swansea
Spring presents itself with a gauge of warming. High temperatures progressively increase from March’s 9.5°C (49.1°F) to reach 15°C (59°F) by May. Similarly, low temperatures rise from 4.8°C (40.6°F) to 9.2°C (48.6°F) within the same period. Rainfall averages between 59mm (2.32") to 73mm (2.87"), with the number of rainy days declining from 18 to 15. Daylight increases with the advance of Spring, from 11.9hrs in March to 15.6hrs by May end.
Summer weather in Swansea
Summer reveals balmy conditions, with temperature highs peaking from 17.7°C (63.9°F) to 19.7°C (67.5°F) between June and August, while lows average between 11.8°C (53.2°F) to 14°C (57.2°F). Rainfall hovers from 64mm (2.52") to 84mm (3.31") and sea temperatures warm up to range between 15.8°C (60.4°F) and 16.8°C (62.2°F). Sunny hours stand at six to seven hours daily and daylight hours peak at 16.6hrs in June before tapering slightly to 14.6hrs by August.
Autumn weather in Swansea
Autumn introduces a cooling trend. High temperatures decline from 17.8°C (64°F) in September to 11.1°C (52°F) by November. Low temperatures follow suit, falling from 12.4°C (54.3°F) to a cooler 6.9°C (44.4°F). Rainfall increases substantiall, from an average of 77mm (3.03") to 112mm (4.41") over an increase in rainy days from 16 to 20. Sea temperatures cool from 16.5°C (61.7°F) to 13.5°C (56.3°F) during this period.
Winter weather in Swansea
The winter season demonstrates colder conditions. Temperature highs descend to between 8.7°C (47.7°F) to 9.5°C (49.1°F) and lows drop from 6.3°C (43.3°F) to 4°C (39.2°F) from December to February. Rainfall persists at high levels with 96mm (3.78") to 110mm (4.33") average precipitation and rainy days peaking at 20 days per month. Sea temperatures continue to cool, with averages hovering between 11.1°C (52°F) to 8.8°C (47.8°F).
Weather in January
Swansea in January brings moderate temperatures and plenty of rain. This month records an average high temperature of 8°C (46.4°F) and a low of 4°C (39.2°F). Singling out this first month as the wettest period in Swansea, rainfall measures approximately 96mm (3.78") spread out over 20 days. Weather in January »
Weather in February
The transition from January to February brings slightly drier weather, though it still remains cold in Swansea. Rainfall drops to an average of 67mm (2.64"), marking this month as one of the less drenched periods in Swansea. Temperatures remain practically constant, yet, with the days getting steadily longer, the city awaits the arrival of the spring season. Weather in February »
Weather in March
Ending the grasp of winter, March heralds the onset of spring in Swansea. There is a slight increase in daily sunshine hours, illuminating the rejuvenating cityscape. Pointing towards a warming trend, the average high temperature climbs to 9.5°C (49.1°F). Weather in March »
Weather in April
Warmth gradually permeates the Swansea atmosphere in April. With rainfall decreasing to 59mm (2.32"), the fourth month witnesses the onset of relatively dry weather often associated with the start of the tourist season. The longer days and extended sunshine hours noticeably boost the city's ambient temperature. Weather in April »
Weather in May
May typically denotes the real onset of spring in Swansea. Despite a small increase in rainfall, with recorded averages at around 63mm (2.48"), the weather conditions remain relatively pleasant. Sunlight increases significantly, leading to a fresh sprouting of greenery across the city. Weather in May »
Weather in June
Swansea celebrates the beginning of summer with June's arrival. Avid beachgoers find joy as the sea temperature rises to an average of 13.7°C (56.7°F), inviting for a refreshing swim. A gradual rise in temperature complements the city's lively atmosphere, filled with summer festivities. Weather in June »
Weather in July
The weather in July, which records a peak average high temperature of 19.6°C (67.3°F), marks a highlight of Swansea's climate. The city bathes in the most substantial amount of sunshine, providing perfect conditions for water sports, especially with the sea temperature peaking at an indulging 15.8°C (60.4°F). Weather in July »
Weather in August
August maintains stable summer conditions seen in July, with equally warm temperatures and ample sunshine. The sea temperature reaches its warmest at an average of 16.8°C (62.2°F), making it perfect for watersports and swimming. Weather in August »
Weather in September
As September arrives, summer starts bidding adieu to Swansea, bringing a noticeable drop in temperature. The average sea temperature falls back to a mild 16.5°C (61.7°F), signaling the end of the swimming season. The decrease in daylight and sunshine hours insinuates the start of autumn. Weather in September »
Weather in October
October in Swansea ushers in the autumn season with considerable rainfall and dropping temperatures. The city witnesses a rainfall surge to 123mm (4.84") on average, making October the wettest month after January in Swansea. Sweater-weather takes hold as the colorful fall foliage transforms the landscape. Weather in October »
Weather in November
November carries forward the regular rainfall from October, receiving close to 112mm (4.41") on average, keeping Swansea quite wet. A marked drop in temperature points towards the impending winter. The days shorten, and the sun appears less frequently, casting long shadows over the city's majestic architecture. Weather in November »
Weather in December
Concluding the calendar year, December in Swansea plunges into full-fledged winter. The high temperature drops further to an average of 8.7°C (47.7°F) as the cold weather takes a firm grip. Given the low UV index reading of zero units, winter wear becomes essential when venturing out. Weather in December »
[Resources]Frequently asked questions
How many days does it rain in Swansea?
Throughout the year, in Swansea, there are 201 rainfall days, and 999mm (39.33") of precipitation is accumulated.
What is the month with the least sunshine in Swansea?
The months with the least sunshine in Swansea are January, November and December, with an average of 2h of sunshine.
What is the coldest time of year in Swansea?
Swansea experiences its average lowest temperatures in February, reaching a peak of 7.8°C (46°F) and a minimum of 3.6°C (38.5°F).
When is the sea coldest in Swansea?
With an average sea temperature of 8.3°C (46.9°F), March is the month with the coldest seawater.
What is the driest month in Swansea?
The month with the least rainfall in Swansea is April, when the rain falls for 14 days and typically collects 59mm (2.32") of precipitation.
What is the month with the most sunshine in Swansea?
May and June, with an average of 7h of sunshine, are months with the most sunshine in Swansea.
When are the longest days in Swansea?
With an average of 16h and 36min of daylight, June has the longest days of the year in Swansea.
What are the months with the highest UV index in Swansea?
June through August, with an average maximum UV index of 6, are months with the highest UV index.
What is the hottest time of year in Swansea?
In Swansea, August is known for its average highest temperatures, reaching a high of 19.7°C (67.5°F) and a low of 14°C (57.2°F).
What is the month with the warmest sea water in Swansea?
The month with the warmest seawater is August, with an average sea temperature of 16.8°C (62.2°F).
What is the wettest month in Swansea?
October is the month with the most rainfall. Rain falls for 19 days and accumulates 123mm (4.84") of precipitation.
When is Daylight Saving Time (DST) in Swansea?
On Sunday, 27. October 2024, at 2:00 am, Daylight Saving Time ends in Swansea, 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 Swansea?
December has the shortest days of the year in Swansea, United Kingdom, with an average of 7h and 54min of daylight.
What is the month with the lowest UV index in Swansea?
With an average maximum UV index of 0, December is the month with the lowest UV index in Swansea, United Kingdom.
Average temperature
Swansea, United Kingdom
The warmest month (with the highest average high temperature) is August (19.7°C).
The month with the lowest average high temperature is February (7.8°C).
The month with the highest average low temperature is August (14°C).
The coldest month (with the lowest average low temperature) is February (3.6°C).
Average rainfall
Swansea, United Kingdom
- Average rainfall in January:
95.5mm - Average rainfall in February:
67mm - Average rainfall in March:
72.9mm - Average rainfall in April:
58.5mm - Average rainfall in May:
62.8mm - Average rainfall in June:
63.8mm
- Average rainfall in July:
71.9mm - Average rainfall in August:
83.9mm - Average rainfall in September:
77.4mm - Average rainfall in October:
123.1mm - Average rainfall in November:
112.1mm - Average rainfall in December:
110.3mm
The wettest month (with the highest rainfall) is October (123.1mm).
The driest month (with the least rainfall) is April (58.5mm).
Average rainfall days
Swansea, United Kingdom
- Average rainfall days in January:
20 days - Average rainfall days in February:
15 days - Average rainfall days in March:
18 days - Average rainfall days in April:
14 days - Average rainfall days in May:
15 days - Average rainfall days in June:
15 days
- Average rainfall days in July:
13 days - Average rainfall days in August:
16 days - Average rainfall days in September:
16 days - Average rainfall days in October:
19 days - Average rainfall days in November:
20 days - Average rainfall days in December:
20 days
The months with the highest number of rainy days are January, November and December (20 days).
The month with the least rainy days is July (13 days).
Average sea temperature
Swansea, United Kingdom
The best month for swimming (with the highest average sea temperature) is August (16.8°C).
The coldest month (with the lowest average sea temperature) is March (8.3°C).
Average daylight / Average sunshine
Swansea, United Kingdom
- Average daylight in January:
8h and 2min - Average daylight in February:
10h and 0min - Average daylight in March:
11h and 5min - Average daylight in April:
13h and 5min - Average daylight in May:
15h and 4min - Average daylight in June:
16h and 4min
- Average daylight in July:
16h and 1min - Average daylight in August:
14h and 4min - Average daylight in September:
12h and 4min - Average daylight in October:
10h and 4min - Average daylight in November:
8h and 5min - Average daylight in December:
7h and 5min
The month with the longest days is June (Average daylight: 16h and 36min).
The month with the shortest days is December (Average daylight: 7h and 54min).
The months with the most sunshine are May and June (Average sunshine: 7h).
The months with the least sunshine are January, November and December (Average sunshine: 2h).
Average UV index
Swansea, United Kingdom
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 0).
Swansea, United Kingdom
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