Brussels
May to June and September.
May, June and September are the best months: highs of 18 to 21 degrees, long evenings and fewer crowds than midsummer. July and August are warm and busy, and December fills with visitors for the Christmas markets. January and February are cold and grey, which suits museums better than walking.
Data checked on October 5, 2026
| Month | High | Low | Rainy days | Verdict |
|---|---|---|---|---|
| January | 6 °C | 1 °C | 19 | · |
| February | 7 °C | 2 °C | 17 | · |
| March | 11 °C | 4 °C | 16 | · |
| April | 15 °C | 6 °C | 13 | · |
| May | 18 °C | 9 °C | 15 | Best |
| June | 21 °C | 12 °C | 14 | Best |
| July | 23 °C | 14 °C | 14 | Busy |
| August | 23 °C | 14 °C | 14 | Busy |
| September | 20 °C | 11 °C | 14 | Best |
| October | 15 °C | 8 °C | 16 | · |
| November | 10 °C | 5 °C | 18 | · |
| December | 7 °C | 2 °C | 19 | Busy |
Climate averages: Royal Meteorological Institute of Belgium.
6 to 15 °C · about 15 rainy days a month
March is still cold with highs near 11 degrees, April reaches about 15 and May about 18. Showers are frequent, but parks turn green and the terraces open again.
What to wear: Pack layers and a light waterproof jacket, and shoes that cope with wet cobbles.
13 to 22 °C · about 14 rainy days a month
Summer highs are 21 to 23 degrees with long evenings. July and August are the busiest months, and hot days above 30 degrees are rare but they do happen.
What to wear: Wear light clothes by day and carry a thin jacket for the evening and for sudden showers.
8 to 15 °C · about 16 rainy days a month
September stays mild at around 20 degrees, October drops to about 15 and November to about 10. Rain becomes more frequent and the days shorten quickly.
What to wear: Bring a warm layer, a rain jacket and closed shoes from October.
2 to 7 °C · about 18 rainy days a month
Winter highs are 6 to 7 degrees and nights sit just above freezing. Snow falls on a few days each month from December to February, and daylight is short. The Christmas market in December brings crowds.
What to wear: Wear a warm coat, hat and gloves, and boots with grip for wet and icy cobbles.
Brussels sees some rain on about half the days of the year, so keep an indoor option for each day. The fine arts museums, the Musical Instruments Museum, the Comic Art Museum, the Art and History Museum and the Parlamentarium all work in wet weather, and the Galeries Royales Saint-Hubert give you a covered walk in the centre. The panorama at the Atomium and the view from Place Poelaert are poor in low cloud, so save them for a clearer day.
Summer afternoons can reach the low 30s on the hottest days, and there is little shade on the Grand-Place or on Place Poelaert. Put those stops in the morning or evening, and use the museums or the cathedral in the middle of the day. The Cinquantenaire park and the Mont des Arts gardens offer some shade, and a bottle of water is enough for a day on foot.