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July is the hottest month in London, with an average high of 24°C / 75°F; January is the coldest (8°C / 47°F). November is the wettest month, averaging 62 mm / 2.4 in of precipitation.
| Month | High °C / °F | Low °C / °F | Precip mm / in | Wet days |
|---|---|---|---|---|
| Jan | 8 / 47 | 2 / 36 | 52 / 2.0 | 10 |
| Feb | 9 / 48 | 3 / 37 | 47 / 1.9 | 9 |
| Mar | 12 / 53 | 4 / 39 | 37 / 1.5 | 8 |
| Apr | 15 / 59 | 6 / 43 | 38 / 1.5 | 8 |
| May | 18 / 65 | 9 / 48 | 44 / 1.7 | 8 |
| Jun | 21 / 71 | 12 / 54 | 41 / 1.6 | 7 |
| Jul | 24 / 75 | 14 / 57 | 40 / 1.6 | 7 |
| Aug | 23 / 74 | 14 / 57 | 57 / 2.2 | 8 |
| Sep | 20 / 68 | 11 / 52 | 43 / 1.7 | 7 |
| Oct | 16 / 60 | 8 / 46 | 59 / 2.3 | 9 |
| Nov | 11 / 53 | 5 / 40 | 62 / 2.4 | 10 |
| Dec | 9 / 47 | 3 / 37 | 53 / 2.1 | 10 |
Extremes since 1948: highest 40°C / 104°F (July 19, 2022), lowest -12°C / 10°F (December 13, 1981).
Daylight lasts about 16.4 hours in June and 7.6 hours in December.
Data: Meteostat — London Heathrow Airport, 1991–2020 averages.
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