Belgium climate

Monthly averages for Brussels, 2021–2025

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

About 851 mm of rain falls in a year, on roughly 146 days. July is the wettest month (93 mm) and April the driest (52 mm).

Wind is strongest in February (17 km/h on average) and lightest in June (12 km/h).

Compared with Dublin, July afternoons are 3°C warmer, and January afternoons 2°C colder.

The hottest day in 2021–2025 reached 36.8°C (19 July 2022), and the coldest night fell to −8.5°C (10 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.

Brussels month by month
Month	High °C	Low °C	Rain mm	Rain days	Sun h/day	Wind km/h
January	6	1	92	13	3.3	16
February	9	3	59	11	5.0	17
March	12	4	59	12	7.6	14
April	14	5	52	11	9.4	14
May	18	9	69	13	10.7	13
June	23	13	75	10	11.7	12
July	23	14	93	13	11.7	13
August	23	15	52	12	10.8	12
September	21	12	67	11	9.1	13
October	16	10	92	13	6.0	15
November	10	5	72	14	4.1	15
December	8	3	69	13	2.6	16