Climate in Cardiff: average temperature by month
In Cardiff the warmest month is July, with 21.4 °C on average in the afternoon; the coolest is January, with 8.3 °C.
The average of the weather stations Oxford (136 km), Pte De La Hague (214 km) and Valley (217 km); nearer ones count more.
| Month | Average high | Coolest to warmest day |
|---|---|---|
| January | 8.3 °C | 8.1 °C – 8.5 °C |
| February | 8.9 °C | 8.4 °C – 9.3 °C |
| March | 10.9 °C | 9.4 °C – 12.2 °C |
| April | 13.5 °C | 12.3 °C – 14.7 °C |
| May | 16.7 °C | 14.8 °C – 18.1 °C |
| June | 19.5 °C | 18.1 °C – 20.7 °C |
| July | 21.4 °C | 20.6 °C – 21.8 °C |
| August | 21.1 °C | 20.2 °C – 21.7 °C |
| September | 18.7 °C | 17.0 °C – 20.1 °C |
| October | 15.1 °C | 13.2 °C – 16.8 °C |
| November | 11.3 °C | 9.7 °C – 13.1 °C |
| December | 9.2 °C | 8.6 °C – 9.6 °C |