Cardiff Climate by Month
Cardiff, Wales, United Kingdom
Mild summers and cool winters, with rain spread through the year.
Cardiff has mild summers and cool winters, with rain spread through the year. Expect highs of 71°F (22°C) in July and 47°F (9°C) in January, with the coldest nights (February) near 37°F (3°C). About 43 in (1102 mm) of rain falls in a typical year, with no clear rainy season. The air is humid, averaging 81% relative humidity.
- Warmest month
- 71°F(22°C)
- Average high, July
- Coldest nights
- 37°F(3°C)
- Average low, February
- Rain per year
- 43 in(1102 mm)
- No clear rainy season
- Humidity
- 81%
- Sunniest: June
Best and worst months in Cardiff
Best for weatherJune to August are the best time for weather in Cardiff: highs near 70°F (21°C) and about 3.3 in (84 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; December is the coldest, with highs of only 48°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)
Cardiff weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 47°F(9°C) | 38°F(3°C) | 4.0 in(101 mm) | 86% | 0.8 |
| FebFebruary | 48°F(9°C) | 37°F(3°C) | 3.3 in(85 mm) | 87% | 1.4 |
| MarMarch | 52°F(11°C) | 39°F(4°C) | 3.1 in(78 mm) | 77% | 2.5 |
| AprApril | 57°F(14°C) | 42°F(6°C) | 2.6 in(65 mm) | 75% | 3.9 |
| MayMay | 63°F(17°C) | 47°F(8°C) | 2.6 in(67 mm) | 75% | 5.0 |
| JunJuneBest | 68°F(20°C) | 52°F(11°C) | 2.8 in(70 mm) | 73% | 5.3 |
| JulJulyBest | 71°F(22°C) | 56°F(13°C) | 3.3 in(83 mm) | 75% | 4.9 |
| AugAugustBest | 70°F(21°C) | 56°F(13°C) | 3.9 in(100 mm) | 76% | 4.1 |
| SepSeptember | 66°F(19°C) | 52°F(11°C) | 3.4 in(86 mm) | 82% | 3.0 |
| OctOctober | 59°F(15°C) | 47°F(9°C) | 4.6 in(118 mm) | 87% | 1.7 |
| NovNovember | 53°F(12°C) | 42°F(6°C) | 5.2 in(132 mm) | 89% | 0.9 |
| DecDecember | 48°F(9°C) | 38°F(4°C) | 4.6 in(117 mm) | 84% | 0.6 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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