Monthly Climate
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Best time to visit London

September is the best time to visit London for general sightseeing, with average highs of 22 °C and about 9 wet days. The comfortable season runs roughly May to September.

It depends what you are going for

One month rarely wins on everything. These are the best months on each measure taken on its own.

If you want Best month On that measure
Sightseeing and walking September comfort 89/100
The least cloud July 50 % average cloud cover
The least rain February 59 mm
Warmth July 26 °C
Cooler weather January -1.2 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days
1 September 89 22 °C 9
2 June 85 24 °C 12
3 August 84 25 °C 11
4 July 80 26 °C 12
5 May 80 19 °C 12
6 October 62 15 °C 12
7 April 51 12 °C 12
8 November 33 7.5 °C 11
9 March 27 5.1 °C 10
10 February 27 -0.1 °C 9
11 December 24 1.7 °C 11
12 January 24 -1.2 °C 11

When to think twice

January scores lowest with about 11 wet days and highs near -1.2 °C. That does not make it a bad month — it depends entirely on what you are travelling for. The numbers are all here; the judgement is yours.

The full year

Month Avg high Rainfall Cloud
January -1.2 °C 73 mm 79 %
February -0.1 °C 59 mm 72 %
March 5.1 °C 69 mm 66 %
April 12.3 °C 92 mm 64 %
May 19.2 °C 98 mm 59 %
June 24.3 °C 102 mm 56 %
July 26.3 °C 101 mm 50 %
August 25.2 °C 83 mm 51 %
September 21.6 °C 85 mm 52 %
October 14.5 °C 86 mm 61 %
November 7.5 °C 78 mm 71 %
December 1.7 °C 70 mm 79 %

Data sources and method

Normal period
1991–2020
Dataset version
era5-1991-2020-scores1.1
Last processed

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: comfort score, beach score, season boundaries. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.