Portsmouth Climate: Weather by Month and Best Time to Visit
Best months for Portsmouth: September, October, August.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 5°C | -3°C | 86 mm | 10 | – | – | 4.7 |
| February | 8°C | -2°C | 88 mm | 10 | – | – | 5.1 |
| March | 13°C | 3°C | 106 mm | 12 | – | – | 5.8 |
| April | 20°C | 8°C | 111 mm | 12 | – | – | 6.9 |
| May | 24°C | 14°C | 117 mm | 13 | – | – | 7.2 |
| June | 28°C | 18°C | 111 mm | 13 | – | – | 7.2 |
| July | 30°C | 20°C | 99 mm | 13 | – | – | 7.1 |
| August | 30°C | 19°C | 77 mm | 11 | – | – | 7.4 |
| September | 26°C | 15°C | 84 mm | 8 | – | – | 8.0 |
| October | 20°C | 9°C | 78 mm | 9 | – | – | 7.6 |
| November | 13°C | 4°C | 82 mm | 9 | – | – | 6.5 |
| December | 7°C | 0°C | 92 mm | 10 | – | – | 5.2 |