Europe › United Kingdom › London
30-year normals (1991-2020)
London has a oceanic/humid subtropical climate, classified as Cfb in the Köppen system. The warmest month is July with an average high of 22°C, while the coldest month is January with lows dropping to 2°C. The annual temperature range of 20°C reflects moderate seasonal variation.
The driest month is September with only 9 rain days and 48mm of precipitation. For travellers, September through to the following month typically offers the best balance of warm temperatures and dry conditions. Average humidity ranges from 65% to 65% throughout the year.
Based on temperature and rainfall data, the best months to visit London are September, May, June. These months offer the most comfortable temperatures with relatively low rainfall, ideal for sightseeing and outdoor activities.
Full Best Time to Visit GuideWarmest Month
22°C
July
Coldest Month
2°C
January
Driest Month
9 days
September
Annual Range
20°C
2° to 22°
| Month | High | Low | Rain Days | Sun | Details |
|---|---|---|---|---|---|
| January | 7°C | 2°C | 11 | 4h | View |
| February | 8°C | 2°C | 10 | 5h | View |
| March | 10°C | 3°C | 10 | 7h | View |
| April | 14°C | 5°C | 11 | 9h | View |
| May | 17°C | 8°C | 10 | 10h | View |
| June | 20°C | 11°C | 10 | 11h | View |
| July | 22°C | 13°C | 11 | 11h | View |
| August | 21°C | 13°C | 10 | 10h | View |
| September | 19°C | 11°C | 9 | 8h | View |
| October | 15°C | 8°C | 11 | 6h | View |
| November | 10°C | 5°C | 11 | 4h | View |
| December | 8°C | 3°C | 11 | 4h | View |
January
11 rain days, 4h sun
February
10 rain days, 5h sun
March
10 rain days, 7h sun
April
11 rain days, 9h sun
May
10 rain days, 10h sun
June
10 rain days, 11h sun
July
11 rain days, 11h sun
August
10 rain days, 10h sun
September
9 rain days, 8h sun
October
11 rain days, 6h sun
November
11 rain days, 4h sun
December
11 rain days, 4h sun
London in July
Data Sources for London
Climate normals represent 30-year averages (1991-2020). Individual years may vary.