Experience the charm of mild and humid weather in Brussels, Belgium, with temperatures averaging 12°C (54°F) in winter and a pleasant 20°C (68°F) in summer. The city boasts over 19 rainy days per month, making an umbrella a must-have accessory. Surprisingly, Brussels' rainfall contributes to its lush parks, perfect for picnics at Parc du Cinquantenaire during the blooming spring season. Visit in May or September for a comfortable climate and fewer tourists!
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Brussels Climate & Weather Averages
Brussels is warmest in August, when daytime highs average 23°C, and coldest in January at around 6°C. The wettest month is December. The table below shows the monthly averages for Brussels, based on recorded data from 2015–2024.
Brussels enjoys a temperate climate without harsh extremes: summers are pleasant (23°C average highs in August), winters cool but manageable (6°C in January), and rain is a year-round companion that peaks in December. Snow does visit — about 12 days a year — but rarely settles in for long.
| Month | Avg High | Avg Low | Rainfall | Sunshine (h/day) | Wind (km/h) | Snow days |
|---|---|---|---|---|---|---|
| Jan | 6° | 2° | 75 mm | 3.6 | 24 | 4 |
| Feb | 8° | 2° | 67 mm | 5.4 | 25 | 3 |
| Mar | 11° | 3° | 71 mm | 7 | 23 | 1 |
| Apr | 14° | 5° | 47 mm | 9.7 | 20 | 1 |
| May | 18° | 9° | 63 mm | 10.9 | 19 | — |
| Jun | 22° | 13° | 71 mm | 11.3 | 19 | — |
| Jul | 23° | 14° | 68 mm | 11.4 | 19 | — |
| Aug | 23° | 15° | 59 mm | 10.7 | 18 | — |
| Sep | 20° | 12° | 64 mm | 9 | 19 | — |
| Oct | 16° | 9° | 72 mm | 6 | 21 | — |
| Nov | 10° | 5° | 69 mm | 4.5 | 22 | 1 |
| Dec | 8° | 4° | 75 mm | 3.2 | 23 | 2 |
A warming climate: Brussels's warmest month (August) has warmed from an average high of 21°C in the 1950s to 23°C today — a shift of +2.4°C over roughly seventy years.
Sunshine is most generous in July, averaging about 11.4 hours a day, and thinnest in December at roughly 3.2 hours. The breeziest stretch of the year comes around February, when daily winds typically peak near 25 km/h.
Best time to visit: July–September offers the most comfortable conditions, with daytime highs around 22°C. Light, breathable layers plus a light waterproof cover most days here. For the coldest spell around January, bring warmer layers.
Brussels weather — frequently asked questions
What is the rainiest month in Brussels?
December is on average the wettest month in Brussels, with about 75 mm of rainfall. The driest month is typically April, at around 47 mm.
Does it snow in Brussels?
Yes. Brussels averages about 12 days with snowfall per year, falling mostly between December and March.
What is the sunniest month in Brussels?
July, with roughly 11.4 hours of sunshine a day on average over 2015–2024. The dimmest month is December, at about 3.2 hours.
When is the best time to visit Brussels?
Weather-wise, July–September is the sweet spot in Brussels: average daytime highs around 22°C with less rain than the December peak. Data from 2015–2024.
Source: Open-Meteo ERA5 archive. Averages computed from daily records.