Portsmouth weather
UK towns · Hampshire, England · 50.82°N 1.09°W
Portsmouth, in Hampshire, England, has its warmest weather in August, when daytime temperatures average 21.3°C, while January nights are the coldest at around 3.5°C. The town sees roughly 953mm of rain a year; October is normally the wettest month and April the driest. Figures are averaged from 2020–2024 observations.
Climate averages
| Month | Avg high | Avg low | Rain | Rain days |
|---|---|---|---|---|
| Jan | 8.3° | 3.5° | 80mm | 12 |
| Feb | 9.8° | 4.9° | 91mm | 14 |
| Mar | 10.6° | 5.3° | 79mm | 14 |
| Apr | 13° | 6° | 49mm | 8 |
| May | 16.3° | 9.3° | 58mm | 11 |
| Jun | 19.7° | 12.6° | 59mm | 11 |
| Jul | 20.8° | 14.5° | 64mm | 12 |
| Aug | 21.3° | 14.9° | 63mm | 11 |
| Sep | 19.5° | 13.2° | 80mm | 12 |
| Oct | 15.8° | 11.1° | 137mm | 17 |
| Nov | 11.9° | 7.3° | 94mm | 12 |
| Dec | 9.5° | 5.5° | 99mm | 14 |
Portsmouth weather FAQs
What is the warmest month in Portsmouth?
August is typically the warmest month in Portsmouth, with average daytime highs of 21.3°C. Summer afternoons (June–August) average around 20.6°C.
What is the wettest month in Portsmouth?
October is usually the wettest month, with around 137mm of rain over roughly 17 rainy days. April is typically the driest (49mm).
How much does it rain in Portsmouth per year?
Portsmouth receives roughly 953mm of precipitation per year, spread over about 148 days with at least 1mm of rain (based on 2020–2024 observations).
How cold are winters in Portsmouth?
Winter nights (December–February) in Portsmouth average around 4.6°C, with January typically the coldest month (average low 3.5°C).