United Kingdom climate

Monthly averages for London, 2021–2025

In London, the warmest month is July, with an average high of 23°C, and the coldest is January, when nights average 1°C.

About 747 mm of rain falls in a year, on roughly 131 days. October is the wettest month (88 mm) and April the driest (38 mm).

Wind is strongest in February (16 km/h on average) and lightest in September (13 km/h).

Compared with Dublin, July afternoons are 4°C warmer, and January afternoons 1°C colder.

The hottest day in 2021–2025 reached 38.0°C (19 July 2022), and the coldest night fell to −10.4°C (11 February 2021).

Temperature

Bars run from the average night-time low to the average daytime high, in °C.

Average total rainfall each month, in millimetres.

Average wind speed at 10 metres each month, in km/h.

London month by month
Month	High °C	Low °C	Rain mm	Rain days	Sun h/day	Wind km/h
January	7	1	69	12	4.2	14
February	10	3	54	11	4.6	16
March	12	4	55	12	6.8	14
April	14	5	38	8	9.8	14
May	18	9	63	12	10.4	13
June	22	12	53	9	12.2	13
July	23	14	70	11	11.5	13
August	23	14	40	7	10.2	13
September	20	12	77	12	8.7	13
October	16	9	88	13	6.3	14
November	11	6	76	12	4.5	14
December	9	4	64	11	3.1	15