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Cardiff, Wales climate
Cfb Oceanic / temperate
Cardiff has a mildly seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 66°F, while the coldest is January averaging around 35°F at night. Around 52 inches of precipitation falls each year, peaking in December (6.3 inches) and easing off in April (3.0 inches). At latitude 51°N, day length swings from 7.7 hours in midwinter to 16.3 hours at midsummer.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Cardiff climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 44 | 44 | 48 | 53 | 58 | 63 | 66 | 65 | 62 | 55 | 49 | 45 |
| Avg temp (°F) | 39 | 39 | 42 | 46 | 51 | 56 | 59 | 58 | 55 | 50 | 44 | 40 |
| Avg low (°F) | 35 | 35 | 36 | 39 | 43 | 48 | 52 | 51 | 48 | 44 | 39 | 36 |
| Precipitation (in) | 5.2 | 4.4 | 4.0 | 3.0 | 3.3 | 3.1 | 3.5 | 4.0 | 3.3 | 5.9 | 6.0 | 6.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 44 | 44 | 48 | 53 | 58 | 63 |
| Avg temp (°F) | 39 | 39 | 42 | 46 | 51 | 56 |
| Avg low (°F) | 35 | 35 | 36 | 39 | 43 | 48 |
| Precipitation (in) | 5.2 | 4.4 | 4.0 | 3.0 | 3.3 | 3.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 66 | 65 | 62 | 55 | 49 | 45 |
| Avg temp (°F) | 59 | 58 | 55 | 50 | 44 | 40 |
| Avg low (°F) | 52 | 51 | 48 | 44 | 39 | 36 |
| Precipitation (in) | 3.5 | 4.0 | 3.3 | 5.9 | 6.0 | 6.3 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 77 | 77 | 76 | 73 | 72 | 73 | 71 | 73 | 71 | 76 | 79 | 79 |
| Relative humidity (%) | 93 | 92 | 89 | 86 | 84 | 84 | 84 | 85 | 87 | 89 | 92 | 93 |
| Wind speed (mph) | 10.4 | 10.0 | 9.3 | 8.3 | 7.9 | 7.6 | 7.5 | 7.6 | 8.1 | 9.2 | 9.4 | 10.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 77 | 77 | 76 | 73 | 72 | 73 |
| Relative humidity (%) | 93 | 92 | 89 | 86 | 84 | 84 |
| Wind speed (mph) | 10.4 | 10.0 | 9.3 | 8.3 | 7.9 | 7.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 73 | 71 | 76 | 79 | 79 |
| Relative humidity (%) | 84 | 85 | 87 | 89 | 92 | 93 |
| Wind speed (mph) | 7.5 | 7.6 | 8.1 | 9.2 | 9.4 | 10.1 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 27 years of daily observations at Liscombe, a weather station, about 53 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.