Southampton climate: monthly averages: annual mean temperature 10.8 C; warmest month Jul (17.8 C); coldest month Feb (4.8 C).
Annual mean temperature: 10.8 C
Warmest month: Jul (17.8 C)
Coldest month: Feb (4.8 C)
Wettest month: Nov (2.91 mm/day)
All-time record high: 33.7 C
All-time record low: -7.4 C
Southampton’s long-term climate averages show a mild maritime pattern, with an annual mean temperature of **10.8°C**, peaking in July at **17.8°C** and dipping to **4.8°C** in February. Rainfall totals around **777 mm yearly**, with November the wettest month (2.91 mm/day). Extreme temperatures range from **-7.4°C** to **33.7°C**.
Annual mean temperature 10.8 C
Warmest month Jul (17.8 C)
Coldest month Feb (4.8 C)
Wettest month Nov (2.91 mm/day)
All-time record high 33.7 C
All-time record low -7.4 C
Annual precipitation 777 mm / year
Coordinates 50.90395, -1.40428
Population 269,781
Average monthly temperature and rainfall in Southampton
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
4.9
2.54
12.9
-7.4
Feb
4.8
2.16
15.3
-6.9
Mar
6.3
1.84
18.6
-4.6
Apr
9.1
1.59
23.6
-2.5
May
12.2
1.74
24.5
0.5
Jun
15.5
1.86
30.1
5.0
Jul
17.8
1.87
33.4
8.2
Aug
17.5
2.06
33.7
6.6
Sep
15.1
1.53
27.8
4.4
Oct
11.8
2.76
26.0
-1.9
Nov
8.0
2.91
17.4
-3.5
Dec
5.6
2.73
13.8
-5.1
What the Southampton climate table shows
Values are multi-decadal climatological averages for the 50.90395, -1.40428 grid cell, not a single year. Rain is the daily mean, so a value of 2.00 mm/day is about 60 mm across a 30-day month. Averages smooth over extremes, so use them for planning rather than for what to pack for next Tuesday.
Frequently asked questions
**What’s Southampton’s warmest month?**?
July averages **17.8°C**, the highest monthly mean temperature in the long-term record.
**How much rain does Southampton get annually?**?
About **777 mm per year**, with November being the wettest month.