Monthly Climate
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Best time to visit London

August is the best time to visit London for general sightseeing, with average highs of 21 °C and about 10 wet days. The comfortable season runs roughly June 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 August comfort 87/100
The least cloud July 64 % average cloud cover
The least rain March 43 mm
Warmth July 22 °C
Cooler weather January 7.4 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days
1 August 87 21 °C 10
2 July 87 22 °C 10
3 June 83 20 °C 10
4 September 82 19 °C 9
5 May 72 17 °C 10
6 October 62 15 °C 11
7 April 57 14 °C 11
8 March 45 10 °C 10
9 November 43 10 °C 11
10 February 35 8.0 °C 9
11 December 32 7.7 °C 11
12 January 30 7.4 °C 11

When to think twice

January scores lowest with about 11 wet days and highs near 7.4 °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 7.4 °C 55 mm 73 %
February 8.0 °C 47 mm 72 %
March 10.5 °C 43 mm 71 %
April 13.5 °C 49 mm 66 %
May 16.6 °C 52 mm 67 %
June 19.6 °C 56 mm 67 %
July 21.8 °C 55 mm 64 %
August 21.4 °C 61 mm 65 %
September 18.6 °C 48 mm 66 %
October 14.6 °C 60 mm 70 %
November 10.4 °C 64 mm 73 %
December 7.7 °C 58 mm 72 %

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.