Climate in Portsmouth: average temperature by month
In Portsmouth the warmest month is July, with 21.8 °C on average in the afternoon; the coolest is January, with 8.3 °C.
The average of the weather stations Oxford (108 km), Pte De La Hague (134 km) and Abbeville (220 km); nearer ones count more.
| Month | Average high | Coolest to warmest day |
|---|---|---|
| January | 8.3 °C | 8.1 °C – 8.6 °C |
| February | 9.0 °C | 8.4 °C – 9.5 °C |
| March | 11.1 °C | 9.5 °C – 12.4 °C |
| April | 13.7 °C | 12.5 °C – 14.9 °C |
| May | 16.8 °C | 15.1 °C – 18.3 °C |
| June | 19.8 °C | 18.3 °C – 21.0 °C |
| July | 21.8 °C | 21.0 °C – 22.2 °C |
| August | 21.6 °C | 20.7 °C – 22.2 °C |
| September | 19.2 °C | 17.4 °C – 20.6 °C |
| October | 15.5 °C | 13.5 °C – 17.2 °C |
| November | 11.4 °C | 9.7 °C – 13.3 °C |
| December | 9.2 °C | 8.6 °C – 9.6 °C |