London weather in August
In August, London has an average high of 23 °C73 °F and an average low of 13 °C55 °F, with about 66 mm2.6 in of precipitation. It is the 2nd warmest month of the year and ranks 4th for precipitation.
How August compares with other months
Compared with July, August is about the same temperature and wetter by 6 mm0.2 in. Compared with September, August is 2.7 °C4.8 °F warmer on average and wetter by 21 mm0.8 in. Daylight lasts about 14.6 hours around the middle of the month. Average relative humidity is 78% and the average cloud amount 72%.
Is August a good time to visit London?
Yes — August is one of the most comfortable months to visit London by our comfort score, which favours average highs of 21–28 °C, lows above 5 °C, little rain and moderate humidity.
What to wear in August
For London in August, pack light layers — T-shirts plus a light sweater or jacket.
August in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| London | 2373 | 1355 | 662.6 |
| Bexley | 2373 | 1355 | 662.6 |
| Slough | 2373 | 1355 | 672.6 |
| Crawley | 2169 | 1356 | 662.6 |
| Luton | 2271 | 1253 | 692.7 |
| Southend-on-Sea | 2271 | 1457 | 632.5 |
| Reading | 2373 | 1254 | 662.6 |
| Basingstoke | 2272 | 1254 | 662.6 |
| Milton Keynes | 2271 | 1253 | 692.7 |
Other months in London
- January7 °C45 °F / 2 °C35 °F
- February8 °C46 °F / 1 °C35 °F
- March10 °C51 °F / 2 °C36 °F
- April14 °C57 °F / 5 °C40 °F
- May17 °C63 °F / 8 °C46 °F
- June21 °C69 °F / 11 °C52 °F
- July23 °C73 °F / 13 °C55 °F
- August23 °C73 °F / 13 °C55 °F
- September20 °C68 °F / 10 °C50 °F
- October15 °C60 °F / 8 °C46 °F
- November11 °C51 °F / 5 °C40 °F
- December8 °C46 °F / 3 °C37 °F
Frequently asked questions
How warm is London in August?
In August the average high in London is 23 °C (73 °F) and the average low is 13 °C (55 °F).
Does it rain a lot in London in August?
On average about 66 mm (2.6 in) of precipitation falls in August; it ranks 4th of the 12 months.
Is August the warmest month in London?
No. The warmest month in London is July, with an average high of 23 °C (73 °F). The coldest month is February, with an average low of 1 °C (35 °F).
How long is the day in London in August?
In the middle of August the day in London lasts about 14.6 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is London in August?
The average relative humidity in August is about 78%. This is a long-term average for the whole day.
How cloudy is London in August?
On average about 72% of the sky is covered by cloud in August. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.