London is warmest in August, averaging 24° by day and 12° at night. The wettest month is October with 105 mm, and the year brings about 761 mm in total.
Month by month
| Month | High | Low | Rain | Daylight | Good for |
|---|---|---|---|---|---|
| January | 7° | 2° | 65 mm | 8.1 h | Cool |
| February | 10° | 2° | 64 mm | 9.6 h | Cool |
| March | 11° | 3° | 62 mm | 11.5 h | Cool |
| April | 14° | 4° | 39 mm | 13.6 h | Mild |
| May | 17° | 7° | 50 mm | 15.4 h | Sightseeing |
| June | 21° | 10° | 57 mm | 16.4 h | Sightseeing |
| July | 23° | 12° | 53 mm | 16.0 h | Sightseeing |
| August | 24° | 12° | 53 mm | 14.4 h | Sightseeing |
| September | 21° | 10° | 57 mm | 12.4 h | Sightseeing |
| October | 16° | 8° | 105 mm | 10.4 h | Sightseeing |
| November | 11° | 5° | 75 mm | 8.5 h | Cool |
| December | 8° | 3° | 81 mm | 7.6 h | Cool |
High and low are average daily maximum and minimum, rain is typical monthly total, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER — averages, not promises.
When to go
Beach weather: No month in London combines swimming warmth with dry skies.
Walking the city: May, June, July, August, September and October — highs of 16–24° and no more than 105 mm of rain a month.