Swansea climate: monthly averages: annual mean temperature 10.8 C; warmest month Aug (16.3 C); coldest month Feb (5.7 C).
Annual mean temperature: 10.8 C
Warmest month: Aug (16.3 C)
Coldest month: Feb (5.7 C)
Wettest month: Nov (4.04 mm/day)
All-time record high: 27.3 C
All-time record low: -4.5 C
Swansea’s climate averages **10.8°C annually**, with August as the warmest month (16.3°C) and February the coldest (5.7°C). The city receives about **1,102 mm of rain yearly**, peaking in November (4.04 mm/day). Extreme temperatures range from **27.3°C** (record high) to **-4.5°C** (record low), reflecting mild but variable conditions.
Annual mean temperature 10.8 C
Warmest month Aug (16.3 C)
Coldest month Feb (5.7 C)
Wettest month Nov (4.04 mm/day)
All-time record high 27.3 C
All-time record low -4.5 C
Annual precipitation 1,102 mm / year
Coordinates 51.62079, -3.94323
Population 300,352
Average monthly temperature and rainfall in Swansea
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
6.1
3.61
12.3
-2.4
Feb
5.7
3.06
13.2
-4.5
Mar
6.7
2.57
16.4
-4.4
Apr
8.9
2.00
19.8
-0.7
May
11.7
2.30
22.0
3.8
Jun
14.5
2.57
25.5
7.2
Jul
16.2
2.81
27.3
10.0
Aug
16.3
3.03
26.6
10.0
Sep
14.8
2.51
23.4
6.9
Oct
12.2
3.72
21.5
3.0
Nov
9.2
4.04
16.6
-1.0
Dec
7.0
4.04
13.2
-2.2
What the Swansea climate table shows
Values are multi-decadal climatological averages for the 51.62079, -3.94323 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
**Is Swansea’s climate mild?**?
Yes, with annual averages around 10.8°C and rare extreme cold or heat.
**When does Swansea get the most rain?**?
November is the wettest month, averaging over 4 mm of rain per day.