Brussels is warmest in August, averaging 25° by day and 13° at night. The wettest month is March with 87 mm, and the year brings about 861 mm in total.
Month by month
| Month | High | Low | Rain | Daylight | Good for |
|---|---|---|---|---|---|
| January | 7° | 1° | 71 mm | 8.2 h | Cool |
| February | 9° | 0° | 76 mm | 9.7 h | Cool |
| March | 12° | 2° | 87 mm | 11.5 h | Cool |
| April | 14° | 5° | 45 mm | 13.6 h | Mild |
| May | 18° | 8° | 65 mm | 15.3 h | Sightseeing |
| June | 23° | 11° | 78 mm | 16.3 h | Sightseeing |
| July | 23° | 13° | 71 mm | 15.9 h | Sightseeing |
| August | 25° | 13° | 65 mm | 14.3 h | Sightseeing |
| September | 22° | 11° | 75 mm | 12.4 h | Sightseeing |
| October | 17° | 8° | 78 mm | 10.4 h | Sightseeing |
| November | 11° | 4° | 69 mm | 8.6 h | Cool |
| December | 7° | 2° | 81 mm | 7.7 h | Cool |
High and low are average daily maximum and minimum, rain is typical monthly total, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER — averages, not promises.
When to go
Beach weather: No month in Brussels combines swimming warmth with dry skies.
Walking the city: May, June, July, August, September and October — highs of 17–25° and no more than 78 mm of rain a month.