Southampton, United Kingdom Climate & Monthly Averages
Southampton has an oceanic climate. July is the hottest month, averaging 71° by day; January is the coldest at 47°.
How weather changes through the year in Southampton
Southampton runs on a dry-summer rhythm: the warmest months are also the driest. April averages 2.0 inches (50 mm) while the wet season peaks in October at 3.8 inches (96 mm). Highs range from 47°F (8°C) to 71°F (22°C).
Southampton climate quick facts
- Hottest month: July - highs near 71°F (22°C)
- Coldest month: January - highs near 47°F (8°C)
- Decade extremes (2015-2024): 94°F (34°C) high · 22°F (-6°C) low
- Wettest month: October (13 rainy days) · Sunniest: June (11.4 h sun/day)
- Climate type: oceanic
- Annual swing: 12°C between the average warmest and coolest month · day to night: 7°C
- Snow: about 1 days a year
- Average humidity: 80%
Temperatures, rain and sunshine
Warmth peaks in July: highs of 71°F (22°C), lows of 57°F (14°C). January bottoms out at 47°F (8°C) in daylight, 36°F (2°C) after dark. Four of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is June through September.
June is the brightest month at 11.4 hours of sun a day, against an annual average of 7.6 - duller than all but 9% of the 3496 cities in our dataset. Days and nights are about 7°C apart on average - narrower than about 83% of the cities we track. Relative humidity averages 80% across the year, more humid than roughly 84% of the cities we track.
Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 94°F (34°C) and the lowest daily minimum 22°F (-6°C).
Where Southampton sits among other climates
- Southampton sits close to the middle of our dataset on most measures: 53°F (11°C) as an annual average, 33.8 inches (858 mm) of precipitation and 7.6 hours of sun a day.
These comparisons use the same ten-year window for every city in the dataset.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 47° | 36° | 12 | 2.9 in | 4.3 h/day | 8.4 h | 40% | 86% |
| February | 49° | 38° | 12 | 2.7 in | 5.1 h/day | 9.9 h | 41% | 83% |
| March | 51° | 40° | 14 | 3.0 in | 6.5 h/day | 11.7 h | 45% | 81% |
| April | 56° | 42° | 10 | 2.0 in | 9.7 h/day | 13.8 h | 34% | 75% |
| May | 62° | 47° | 11 | 2.6 in | 10.7 h/day | 15.5 h | 36% | 76% |
| June | 68° | 53° | 10 | 2.3 in | 11.4 h/day | 16.5 h | 34% | 75% |
| July | 71° | 57° | 10 | 2.2 in | 11.3 h/day | 16.1 h | 33% | 74% |
| August | 71° | 57° | 11 | 2.8 in | 9.8 h/day | 14.5 h | 35% | 78% |
| September | 66° | 53° | 11 | 2.9 in | 8.4 h/day | 12.5 h | 36% | 79% |
| October | 60° | 49° | 13 | 3.8 in | 6.2 h/day | 10.6 h | 41% | 84% |
| November | 52° | 43° | 12 | 3.3 in | 4.6 h/day | 8.8 h | 40% | 86% |
| December | 49° | 41° | 13 | 3.4 in | 3.4 h/day | 8.0 h | 41% | 88% |
Southampton month by month
Each card shows the average high and low. The bar places that month between Southampton's coldest night and warmest afternoon.
January
- Rain
- 12 days
- Sunshine
- 4.3 h
- Daylight
- 8.4 h
February
- Rain
- 12 days
- Sunshine
- 5.1 h
- Daylight
- 9.9 h
March
- Rain
- 14 days
- Sunshine
- 6.5 h
- Daylight
- 11.7 h
April
- Rain
- 10 days
- Sunshine
- 9.7 h
- Daylight
- 13.8 h
May
- Rain
- 11 days
- Sunshine
- 10.7 h
- Daylight
- 15.5 h
June
- Rain
- 10 days
- Sunshine
- 11.4 h
- Daylight
- 16.5 h
July
- Rain
- 10 days
- Sunshine
- 11.3 h
- Daylight
- 16.1 h
August
- Rain
- 11 days
- Sunshine
- 9.8 h
- Daylight
- 14.5 h
September
- Rain
- 11 days
- Sunshine
- 8.4 h
- Daylight
- 12.5 h
October
- Rain
- 13 days
- Sunshine
- 6.2 h
- Daylight
- 10.6 h
November
- Rain
- 12 days
- Sunshine
- 4.6 h
- Daylight
- 8.8 h
December
- Rain
- 13 days
- Sunshine
- 3.4 h
- Daylight
- 8.0 h
Looking for warmer alternatives? Browse warm places by month, or compare Southampton's coolest part of the year: January, February, December.
A season-by-season guide to Southampton
Spring (March through May)
Through spring, Southampton runs cool rather than cold: 57°F (14°C) by day, 43°F (6°C) after dark, and rain falls on around 35 of the 90 days.
Summer (June through August)
Summer brings comfortable warmth here - highs near 70°F (21°C), nights near 56°F (13°C), and rain falls on around 31 of the 90 days. Daylight is generous - around 10.8 hours of sun a day.
Fall (September through November)
Through fall, Southampton is crisp but comfortable: 59°F (15°C) by day, 48°F (9°C) after dark, and rain falls on around 36 of the 90 days.
Winter (December through February)
Winter in Southampton is chilly, with daytime highs averaging 48°F (9°C) and nights around 38°F (4°C); rain falls on around 37 of the 90 days.
Questions people ask about Southampton's climate
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The most useful weather window for Southampton
Best time to visit Southampton
Aim for May to September if you get the choice: the dry season is running but the afternoons are still bearable, and highs average 68°F (20°C) against roughly 11 wet days a month. For the same question asked the other way round, see where else is warm in May.
What to pack
Pack for Southampton with a warm jacket and layers for the cooler season and a compact umbrella or rain shell. July nights average 57°F (14°C), so evenings rarely match the afternoons.
Southampton temperature extremes in the 2015–2024 dataset
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need another precipitation unit? Use the rainfall converter.