Swansea Climate by Month
Swansea, Wales, United Kingdom
Mild summers and cool winters, with rain spread through the year.
Swansea has mild summers and cool winters, with rain spread through the year. Afternoon highs range from 47°F (9°C) in January to 70°F (21°C) in July, and February nights average 38°F (3°C). It gets 45 in (1147 mm) of rain a year, spread across the months. The air is humid, averaging 82% relative humidity.
- Warmest month
- 70°F(21°C)
- Average high, July
- Coldest nights
- 38°F(3°C)
- Average low, February
- Rain per year
- 45 in(1147 mm)
- No clear rainy season
- Humidity
- 82%
- Sunniest: June
Best and worst months in Swansea
Best for weatherThe most comfortable weather comes from June to August, with highs around 69°F (20°C) and about 3.5 in (89 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; December is the coldest, with highs of only 49°F (9°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in July.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Swansea weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 47°F(9°C) | 38°F(4°C) | 4.3 in(110 mm) | 85% | 0.7 |
| FebFebruary | 47°F(9°C) | 38°F(3°C) | 3.3 in(84 mm) | 86% | 1.4 |
| MarMarch | 51°F(11°C) | 40°F(4°C) | 3.1 in(78 mm) | 87% | 2.5 |
| AprApril | 56°F(13°C) | 43°F(6°C) | 2.7 in(69 mm) | 75% | 3.9 |
| MayMay | 62°F(17°C) | 48°F(9°C) | 2.8 in(71 mm) | 75% | 4.9 |
| JunJuneBest | 67°F(19°C) | 53°F(12°C) | 3.1 in(78 mm) | 74% | 5.3 |
| JulJulyBest | 70°F(21°C) | 57°F(14°C) | 3.6 in(92 mm) | 76% | 4.8 |
| AugAugustBest | 69°F(21°C) | 56°F(14°C) | 3.8 in(97 mm) | 77% | 4.1 |
| SepSeptember | 65°F(18°C) | 53°F(11°C) | 3.3 in(85 mm) | 83% | 3.0 |
| OctOctober | 59°F(15°C) | 48°F(9°C) | 4.8 in(122 mm) | 86% | 1.7 |
| NovNovember | 53°F(12°C) | 43°F(6°C) | 5.4 in(136 mm) | 88% | 0.9 |
| DecDecember | 49°F(9°C) | 39°F(4°C) | 4.9 in(125 mm) | 92% | 0.6 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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