Climate and monthly weather forecastSouthampton, United Kingdom
Climate and monthly weather forecast
The climate of Southampton
Southampton is located on the southern coast of England, identifying with the Köppen climate classification as Cfb which is typical for a marine west coast climate with warm summers. The city experiences moderate weather conditions due to the influence of the Gulf Stream.The overall weather throughout the year is relatively mild with temperatures ranging from 3.3°C (37.9°F) to 20.7°C (69.3°F). However, these temperatures show a noticeable variation with July being the warmest month with an average high of 20.7°C (69.3°F) while the coldest month registers in January at an average low temperature of 3.3°C (37.9°F). The city is notably humid with relative humidity readings averaging between 79% and 87% with the highest recorded in December and January and the lowest in July and August.
Throughout the year, Southampton receives an average rainfall of between 27mm (1.06") and 61mm (2.4"). December experiences the highest amount of rainfall at 61mm (2.4") across 16.7 days, making it the wettest month. The driest period falls between April and May when the city receives 31mm (1.22") and 27mm (1.06") respectively. The number of snowfall days remains relatively low and negligible in the summer months. The most snowfall is recorded in January and December with up to 6mm (0.24") and 8mm (0.31") respectively.
Southampton has a consistent sea temperature range of 8.6°C (47.5°F) in March to 17.3°C (63.1°F) in September. The city portrays a decent daylight range from as low as 8 hours in December to a peak of 16.4 hours in June. The sunshine duration is also significantly different across the months, with an average of 4.1 hours in January and December and up to 8.7 hours during July.
The best time to visit Southampton
Spring and Summer are generally the best times to visit Southampton. During these periods, the temperatures are considerably mild and comfortable. For instance, in May, the average high temperature reaches 15.7°C (60.3°F) with low temperatures averaging at 7.8°C (46°F). The rainfall is also relatively low during this period. On the other hand, the summer months of June to August provide an appealing time for tourists. The temperatures range from 13.3°C (55.9°F) to 20.7°C (69.3°F), and the city gets ample sunshine, with the peak day reaching 8.7 hours in July.The worst time to visit Southampton
The periods between late autumn and winter may not be the most appealing for visitors due to the colder temperatures and increased rainfall. November registers an increase in rainfall, peaking at 56mm (2.2"), and averaging at 6.8°C (44.2°F) for low temperatures. December and January follow suit with high rainfall, low temperatures, and fewer daylight hours.Spring weather in Southampton
Spring months in Southampton register a moderate weather pattern. The months of March, April, and May witness a gradual increase in temperatures from 10.4°C (50.7°F) to 15.7°C (60.3°F). Rainfall during this period ranges from 31mm (1.22") in March to 27mm (1.06"), the least in the year, in April. Despite fewer rainfall days, spring provides ample daylight with an increase from 11.9 hours in March to 15.6 hours by the end of May.Summer weather in Southampton
During the summer months of June, July, and August, Southampton experiences increased temperatures from average highs of 18.6°C (65.5°F) in June to 20.7°C (69.3°F) in July. Although rainfall increases to 38mm (1.5") in June, there is a decline in August, registering 33mm (1.3"). Days in summer are significantly longer with daylight hours peaking at 16.4 hours in June.Autumn weather in Southampton
Autumn in Southampton is relatively wet, with October being the wettest month. The temperatures during this season range from 18.3°C (64.9°F) in September to 11°C (51.8°F) by November. Rainfall increases in October, peaking at 49mm (1.93") while daylight hours begin to decrease throughout the season, reducing to nearly 9 hours in November.Winter weather in Southampton
Southampton experiences mild winters due to its coastal location. The months of December, January, and February are the chilliest with temperatures ranging from 7.8°C (46°F) to 3.3°C (37.9°F). Winter also brings more rainfall with December having the highest rainfall at 61mm (2.4"). Despite the cold, daylight hours during this season are substantially shorter with December registering only 8 hours.Weather in January
The new year begins with an atmospheric tone, as January unfolds in Southampton, United Kingdom. Looking at the climatological data, temperatures hover between a low of 3.3°C (37.9°F) and a high of 7.4°C (45.3°F), maintaining a bearable coldness. Weather in January »Weather in February
The weather progresses mildly in February with slightly increasing temperatures, a hint of the upcoming warmth. A slight decrease in rainfall and humidity indicates the arrival of drier days. Amid these circumstances, the sea maintains its cool composure at 9°C (48.2°F), a decrease compared to the previous month. Weather in February »Weather in March
The first whispers of spring become noticeable in March. Temperature ranges escalate to between 4.1°C (39.4°F) and 10.4°C (50.7°F) showcasing a positional shift in the weather pattern. Wind speed drops to 17.5km/h (10.9mph), marking a calmer atmosphere as winter's gusty reign concludes. Weather in March »Weather in April
April brings a definitive arrival of spring in Southampton, with inviting weather conditions. In comparison to March, both daytime temperatures and sea temperatures begin to rise, signifying a more welcoming environment for outdoor pursuits. Weather in April »Weather in May
May finds its place in the year as a time of growth and warmth. A noticeable spike in temperature, reaching upto 15.7°C (60.3°F), underscores the approach of summer. The sea warms up to 11.5°C (52.7°F), inviting marine activities to come alive. Weather in May »Weather in June
Summer makes its grand entry in June, establishing itself with prominent sunny patterns. There is a significant increase in overall temperatures and sea temperatures, reaching 18.6°C (65.5°F) and 13.6°C (56.5°F) respectively. The UV index steps up to 5, creating a bright, sunlit environment, perfect for outdoor activities. Weather in June »Weather in July
July marks the peak of summer in Southampton, offering the sunniest and warmest days of the year. The distinction of being the hottest month is evident with maximum temperatures soaring up to 20.7°C (69.3°F). The warmth extends to the sea as well, making it suitable for maritime escapades. Weather in July »Weather in August
August, although a summer month, begins to demonstrate signs of a subdued climate. Notably, the sea temperature attains its highest level at 16.8°C (62.2°F), encouraging a variety of water activities. The decline in overall temperature and sunlight hours signify the onset of transition from summer to autumn. Weather in August »Weather in September
September hails the advent of autumn, showcasing varying weather patterns. The swift reduction in temperature to 18.3°C (64.9°F) from August’s 20.3°C (68.5°F) initiates the change towards cooler days. Although rainfall is relatively less, the humidity level persists, embodying classic autumn weather. Weather in September »Weather in October
October embodies the heart of autumn, with weather conditions mirroring typical fall patterns. A stark dip in temperature to 15.1°C (59.2°F) and an increase in rainfall characterizes the month's climatic peculiarity. The sea responds to the changing patterns, lowering its temperature to match the ambient conditions. Weather in October »Weather in November
As November unfolds, Southampton drifts deeper into autumn's grip, with noticeable drops in temperature to around 11°C (51.8°F). The fading sunlight intensity and shrinking daylight hours portray the advancing proximity of winter. Weather in November »Weather in December
December sees Southampton, United Kingdom ushering in winter. The month stands out with the highest rainfall of 61mm (2.4") and the return of snowfall with an average of 8mm (0.31"). The near-freezing temperatures, coupled with the shortest daylight hours and limited sunshine, intensify the winter setting. Weather in December »Updated: Feb 8, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January brings the lowest temperatures in Southampton, United Kingdom, with an average high of 7.4°C (45.3°F) and an average low of 3.3°C (37.9°F).
January and December, with an average relative humidity of 87%, are most humid months in Southampton.
Throughout the year, in Southampton, United Kingdom, there are 184.9 rainfall days, and 482mm (18.98") of precipitation is accumulated.
January through March, November and December are months with snowfall.
In Southampton, United Kingdom, during the entire year, snow falls for 4.5 days and aggregates up to 20mm (0.79") of snow.
January, February and November, with an average maximum UV index of 2, are months with the lowest UV index.
February has the least sunshine of the year, with an average of 3.9h of sunshine.
March is the month with the coldest seawater, with an average sea temperature of 8.6°C (47.5°F).
April is the month with the least rainfall in Southampton, United Kingdom. Rain falls for 14.3 days and accumulates 27mm (1.06") of precipitation.
April through October are months without snowfall.
With an average of 16h and 24min of daylight, June has the longest days of the year in Southampton.
The months with the highest UV index are June and July, with an average maximum UV index of 5.
July registers as the month with the average highest temperatures, reaching 20.7°C (69.3°F) at its peak and 13°C (55.4°F) at the lowest.
The months with the lowest humidity are July and August, with an average relative humidity of 79%.
With an average of 8.7h of sunshine, July has the most sunshine of the year in Southampton.
With an average sea temperature of 17.3°C (63.1°F), September is the month with the warmest seawater in Southampton, United Kingdom.
On Sunday, 27. October 2024, at 2:00 am, Daylight Saving Time ends in Southampton, 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.
December is the month with the most rainfall in Southampton, United Kingdom. Rain falls for 16.7 days and accumulates 61mm (2.4") of precipitation.
December is the month with the most snowfall. Snow falls for 1.1 days and accumulates 8mm (0.31") of snow.
With an average of 8h and 0min of daylight, December has the shortest days of the year.
Average temperature
Southampton, United Kingdom
The warmest month (with the highest average high temperature) is July (20.7°C).
The month with the lowest average high temperature is January (7.4°C).
The month with the highest average low temperature is August (13.3°C).
The coldest months (with the lowest average low temperature) are January and February (3.3°C).
Average pressure
Southampton, United Kingdom
- Average pressure in January:
1014.9mbar - Average pressure in February:
1014.2mbar - Average pressure in March:
1015.7mbar - Average pressure in April:
1015.6mbar - Average pressure in May:
1016.9mbar - Average pressure in June:
1016.3mbar
- Average pressure in July:
1015.7mbar - Average pressure in August:
1015.3mbar - Average pressure in September:
1017.2mbar - Average pressure in October:
1015.2mbar - Average pressure in November:
1010.7mbar - Average pressure in December:
1015mbar
The month with the highest atmospheric pressure is September (1017.2mbar).
The month with the lowest atmospheric pressure is November (1010.7mbar).
Average wind speed
Southampton, United Kingdom
- Average wind speed in January:
18.6km/h - Average wind speed in February:
19.3km/h - Average wind speed in March:
17.5km/h - Average wind speed in April:
14.6km/h - Average wind speed in May:
14.4km/h - Average wind speed in June:
14.2km/h
- Average wind speed in July:
14km/h - Average wind speed in August:
14.4km/h - Average wind speed in September:
15km/h - Average wind speed in October:
16.8km/h - Average wind speed in November:
18.4km/h - Average wind speed in December:
19.2km/h
The windiest month (with the highest average wind speed) is February (19.3km/h).
The calmest month (with the lowest average wind speed) is July (14km/h).
Average humidity
Southampton, United Kingdom
The months with the highest relative humidity are January and December (87%).
The months with the lowest relative humidity are July and August (79%).
Average rainfall
Southampton, United Kingdom
The wettest month (with the highest rainfall) is December (61mm).
The driest month (with the least rainfall) is April (27mm).
Average rainfall days
Southampton, United Kingdom
- Average rainfall days in January:
16.8 days - Average rainfall days in February:
14.7 days - Average rainfall days in March:
13 days - Average rainfall days in April:
14.3 days - Average rainfall days in May:
15.8 days - Average rainfall days in June:
14.7 days
- Average rainfall days in July:
16.8 days - Average rainfall days in August:
16.6 days - Average rainfall days in September:
12.3 days - Average rainfall days in October:
15.7 days - Average rainfall days in November:
17.5 days - Average rainfall days in December:
16.7 days
The month with the highest number of rainy days is November (17.5 days).
The month with the least rainy days is September (12.3 days).
Average snowfall
Southampton, United Kingdom
The month with the highest snowfall is December (8mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days
Southampton, United Kingdom
- Average snowfall days in January:
1.5 days - Average snowfall days in February:
1.2 days - Average snowfall days in March:
0.3 days - Average snowfall days in April:
0.1 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:
0.3 days - Average snowfall days in December:
1.1 days
The month with the highest number of snowfall days is January (1.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature
Southampton, United Kingdom
The best month for swimming (with the highest average sea temperature) is September (17.3°C).
The coldest month (with the lowest average sea temperature) is March (8.6°C).
Average daylight / Average sunshine
Southampton, United Kingdom
- Average daylight in January:
8h and 30min - Average daylight in February:
10h and 0min - Average daylight in March:
11h and 54min - Average daylight in April:
13h and 54min - Average daylight in May:
15h and 36min - Average daylight in June:
16h and 24min
- Average daylight in July:
16h and 0min - Average daylight in August:
14h and 30min - Average daylight in September:
12h and 36min - Average daylight in October:
10h and 42min - Average daylight in November:
9h and 0min - Average daylight in December:
8h and 0min
The month with the longest days is June (Average daylight: 16h and 24min).
The month with the shortest days is December (Average daylight: 8h and 0min).
- Average sunshine in January:
4h and 6min - Average sunshine in February:
3h and 54min - Average sunshine in March:
5h and 48min - Average sunshine in April:
8h and 12min - Average sunshine in May:
8h and 6min - Average sunshine in June:
8h and 12min
- Average sunshine in July:
8h and 42min - Average sunshine in August:
8h and 18min - Average sunshine in September:
7h and 54min - Average sunshine in October:
4h and 42min - Average sunshine in November:
4h and 6min - Average sunshine in December:
4h and 18min
The month with the most sunshine is July (Average sunshine: 8h and 42min).
The month with the least sunshine is February (Average sunshine: 3h and 54min).
Average sunshine days
Southampton, United Kingdom
- Average sunshine days in January:
11.3 days - Average sunshine days in February:
10.7 days - Average sunshine days in March:
14 days - Average sunshine days in April:
12.6 days - Average sunshine days in May:
11.7 days - Average sunshine days in June:
11.8 days
- Average sunshine days in July:
11 days - Average sunshine days in August:
10.7 days - Average sunshine days in September:
13.8 days - Average sunshine days in October:
11.7 days - Average sunshine days in November:
8.9 days - Average sunshine days in December:
10.1 days
The month with the most sunshine days is March (14 days).
The month with the least sunshine days is November (8.9 days).
Average UV index
Southampton, United Kingdom
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February and November (UV index 2).
Average cloud cover
Southampton, United Kingdom
The month with the most cloud cover is November (Cloud cover 59).
The month with the least cloud cover is September (Cloud cover 44).
Average visibility
Southampton, 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).
