Portsmouth, United Kingdom Climate by Month
Portsmouth, England, United Kingdom
Mild summers and cool winters, with rain spread through the year.
The climate in Portsmouth is one of mild summers and cool winters, with rain spread through the year. Afternoon highs range from 47°F (9°C) in January to 72°F (22°C) in July, and February nights average 37°F (3°C). It gets 33 in (844 mm) of rain a year, spread across the months. The air is humid, averaging 81% relative humidity.
- Warmest month
- 72°F(22°C)
- Average high, July
- Coldest nights
- 37°F(3°C)
- Average low, February
- Rain per year
- 33 in(844 mm)
- No clear rainy season
- Humidity
- 81%
- Sunniest: June
Best and worst months in Portsmouth
Best for weatherJuly and August are the best time for weather in Portsmouth: highs near 72°F (22°C) and about 2.2 in (56 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 47°F (9°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in July.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Portsmouth weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 47°F(9°C) | 38°F(3°C) | 3.5 in(90 mm) | 86% | 0.8 |
| FebFebruary | 47°F(9°C) | 37°F(3°C) | 2.5 in(63 mm) | 87% | 1.4 |
| MarMarch | 51°F(11°C) | 40°F(4°C) | 2.2 in(57 mm) | 77% | 2.6 |
| AprApril | 57°F(14°C) | 43°F(6°C) | 2.0 in(52 mm) | 74% | 3.9 |
| MayMay | 63°F(17°C) | 47°F(9°C) | 1.9 in(47 mm) | 74% | 4.8 |
| JunJune | 68°F(20°C) | 53°F(12°C) | 2.2 in(55 mm) | 78% | 5.2 |
| JulJulyBest | 72°F(22°C) | 56°F(14°C) | 2.1 in(53 mm) | 78% | 5.1 |
| AugAugustBest | 71°F(22°C) | 56°F(14°C) | 2.3 in(59 mm) | 79% | 4.3 |
| SepSeptember | 67°F(19°C) | 53°F(12°C) | 2.5 in(63 mm) | 80% | 3.1 |
| OctOctober | 60°F(16°C) | 48°F(9°C) | 4.0 in(102 mm) | 85% | 1.8 |
| NovNovember | 53°F(12°C) | 42°F(6°C) | 4.2 in(107 mm) | 89% | 0.9 |
| DecDecember | 49°F(9°C) | 39°F(4°C) | 3.8 in(96 mm) | 82% | 0.6 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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