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London weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit London?
For a warm holiday, the best week has been 16–22 July (Weather Index 86). Favourable start dates for a 7-day trip run from 12 July to 19 July. July is warmest (23°C), August is driest and June has the most sun.
- Warmest
- July 23°C
- Coolest
- January 8°C
- Driest
- August 29% rain-day chance
- Wettest
- March 41% rain-day chance
- Sunniest
- June 12 hours a day
A rain day has 1 mm or more, snow included, so a short shower counts. Monthly averages below give the amounts.
Monthly averages in London
London historical monthly estimates, 2016–2025. Temperatures and sunshine are daily averages.
| Month | High (°C) | Low (°C) | Rain-day chance (%) | Expected rain days | Precipitation (mm/month) | Sunshine (hours/day) |
|---|---|---|---|---|---|---|
| January | 7.8 | 2.5 | 36.5 | 11.3 | 59.3 | 4.0 |
| February | 9.2 | 3.6 | 35.7 | 10.0 | 48.3 | 5.1 |
| March | 11.1 | 4.6 | 41.3 | 12.8 | 54.6 | 6.8 |
| April | 14.0 | 5.7 | 32.0 | 9.6 | 41.0 | 9.9 |
| May | 17.7 | 9.1 | 31.3 | 9.7 | 53.3 | 11.0 |
| June | 21.0 | 12.4 | 30.0 | 9.0 | 61.7 | 11.5 |
| July | 22.7 | 14.3 | 31.6 | 9.8 | 54.8 | 11.1 |
| August | 22.3 | 14.1 | 29.0 | 9.0 | 52.5 | 10.0 |
| September | 19.6 | 11.8 | 35.3 | 10.6 | 56.3 | 8.1 |
| October | 15.4 | 9.2 | 37.1 | 11.5 | 71.9 | 6.0 |
| November | 10.9 | 5.5 | 38.3 | 11.5 | 65.7 | 4.6 |
| December | 9.0 | 4.4 | 38.4 | 11.9 | 64.7 | 3.2 |
Each month averages its own days. Precipitation includes snow. About the data
Sources
Open-Meteo · 1 Jan 2016 – 31 Dec 2025
- Open-Meteo Historical Weather API
- Local days, 2016–2025, every year weighted equally. Each weekly chart averages its own seven days, without smoothing.
- Shading shows the 10th–90th percentile of past days, not forecast confidence.
- A rain day has at least 1 mm, snow included. The last weekly period has eight days.
- Wind is the average daytime (10:00–18:00) maximum, not gusts. Daylight is calculated from latitude. Missing readings stay blank.
- Mugginess (dew point) comes from the original daily summaries, on UTC days.
- The live two-week forecast comes from the Open-Meteo Weather Forecast API. The Weather Index does not use it.