London, United Kingdom is most comfortable in February, March, April. The toughest month for heat is July (comfort 97/100). In August, daytime highs average 22.8°C (feels like 21.5°C) with 1.2 days over 30°C and 0 tropical nights.
| Month | Avg high | Avg low | Feels like | Days ≥30°C | Days ≥35°C | Nights ≥20°C | Comfort |
|---|---|---|---|---|---|---|---|
| January | 7.4° | 1.6° | 3.8° | 0 | 0 | 0 | 98 |
| February | 9.6° | 3.5° | 5.8° | 0 | 0 | 0 | 100 |
| March | 11.8° | 4.3° | 8.2° | 0 | 0 | 0 | 100 |
| April | 14.1° | 5.1° | 10.6° | 0 | 0 | 0 | 100 |
| May | 17.8° | 8.9° | 15.5° | 0 | 0 | 0 | 100 |
| June | 22° | 12.2° | 20.7° | 1 | 0 | 0 | 99 |
| July | 23° | 14.3° | 21.9° | 1.2 | 0.4 | 0.4 | 97 |
| August | 22.8° | 14° | 21.5° | 1.2 | 0 | 0 | 99 |
| September | 20.2° | 12.2° | 18.8° | 0.4 | 0 | 0 | 100 |
| October | 16.2° | 9.5° | 14.2° | 0 | 0 | 0 | 100 |
| November | 11.3° | 5.8° | 8.6° | 0 | 0 | 0 | 100 |
| December | 9.2° | 4.6° | 6° | 0 | 0 | 0 | 100 |
No. August daytime highs in London average a comfortable 22.8°C with 1.2 days over 30°C — it's a solid summer choice for avoiding extreme heat.
Based on 5 years of climate data, the most comfortable months in London are February, March, April. The toughest month for heat is July, scoring 97/100 on our heat-comfort index.
In August, nights in London average a low of 14°C, with 0 tropical nights per month (nights that stay at or above 20°C) — a key factor for sleep quality if your stay has no air conditioning.
Tell us where and when you're going. If a heatwave becomes likely for your dates, we'll email you early — with cooler day-by-day alternatives nearby.