What is the hottest month in London?

July is the hottest month in London, with average daytime highs of 23°C / 73°F and overnight lows of 14°C / 58°F (averages for 2021–2025).

What is the coldest month in London?

January is the coldest month in London, with average highs of 7°C / 45°F and lows of 2°C / 35°F.

How much rain does London get a year?

London receives about 747 mm of rainfall a year, spread over roughly 128 wet days. October is the wettest month (87 mm on average) and April the driest (39 mm).

When is the best time to visit London?

August, June, July are the most comfortable months in London: mild daytime temperatures with the least rainfall of the year.

London Climate — Average Highs, Lows & Rainfall by Month

London has a temperate climate with four distinct seasons. Daytime temperatures average 23°C / 73°F in July, the warmest month, and drop to 7°C / 45°F in January, the coldest. Overnight lows in January average 2°C / 35°F. London receives about 747 mm of rain a year across roughly 128 wet days, with October the wettest month.

Averages for 2021–2025 · Open-Meteo Historical Weather API (ERA5 reanalysis) · Updated 2026-10-05

Hottest month

July

23°C / 73°F

Coldest month

January

2°C / 35°F

Wettest month

October

87 mm

Annual rainfall

747 mm

~128 wet days

Monthly averages in London

Average daytime high, overnight low and rainfall for each month of the year.

Average temperatures and rainfall by month in London, 2021–2025
Month	Avg high	Avg low	Rainfall	Wet days
January	7°C / 45°F	2°C / 35°F	69 mm	11
February	10°C / 49°F	4°C / 38°F	54 mm	11
March	12°C / 53°F	4°C / 40°F	54 mm	12
April	14°C / 57°F	5°C / 41°F	39 mm	8
May	18°C / 64°F	9°C / 48°F	63 mm	12
June	22°C / 72°F	12°C / 54°F	53 mm	8
July	23°C / 73°F	14°C / 58°F	70 mm	11
August	23°C / 73°F	14°C / 57°F	40 mm	7
September	20°C / 68°F	12°C / 54°F	77 mm	12
October	16°C / 61°F	10°C / 49°F	87 mm	13
November	11°C / 52°F	6°C / 42°F	76 mm	12
December	9°C / 49°F	5°C / 40°F	64 mm	11

Best time to visit London

August, June, July offer the most comfortable weather in London: mild daytime temperatures with the year's lowest rainfall — August averages 23°C (73°F); June averages 22°C (72°F); July averages 23°C (73°F).

London climate FAQ

What is the hottest month in London?: July is the hottest month in London, with average daytime highs of 23°C / 73°F and overnight lows of 14°C / 58°F (averages for 2021–2025).
What is the coldest month in London?: January is the coldest month in London, with average highs of 7°C / 45°F and lows of 2°C / 35°F.
How much rain does London get a year?: London receives about 747 mm of rainfall a year, spread over roughly 128 wet days. October is the wettest month (87 mm on average) and April the driest (39 mm).
When is the best time to visit London?: August, June, July are the most comfortable months in London: mild daytime temperatures with the least rainfall of the year.

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Source: Open-Meteo Historical Weather API (ERA5 reanalysis), Open-Meteo. Averages are daily means across 2021–2025 and are rounded for display — for a live forecast see the London weather page.