Brussels, Belgium is most comfortable in February, March, April. The toughest month for heat is January (comfort 95/100). In August, daytime highs average 23.3°C (feels like 22.7°C) with 2.4 days over 30°C and 0.2 tropical nights.
| Month | Avg high | Avg low | Feels like | Days ≥30°C | Days ≥35°C | Nights ≥20°C | Comfort |
|---|---|---|---|---|---|---|---|
| January | 5.9° | 1.3° | 2° | 0 | 0 | 0 | 95 |
| February | 8.8° | 2.9° | 4.8° | 0 | 0 | 0 | 100 |
| March | 11.7° | 3.7° | 8.3° | 0 | 0 | 0 | 100 |
| April | 13.8° | 5.2° | 10.8° | 0 | 0 | 0 | 100 |
| May | 18.3° | 9.3° | 16.4° | 0 | 0 | 0 | 100 |
| June | 22.6° | 13.2° | 22.1° | 1.2 | 0 | 0.4 | 98 |
| July | 22.8° | 14.3° | 22.3° | 1.2 | 0.4 | 0.6 | 97 |
| August | 23.3° | 14.8° | 22.7° | 2.4 | 0 | 0.2 | 97 |
| September | 20.6° | 12.5° | 19.5° | 0.8 | 0 | 0.4 | 99 |
| October | 16.2° | 9.8° | 14.2° | 0 | 0 | 0 | 100 |
| November | 10.2° | 5.4° | 7.2° | 0 | 0 | 0 | 100 |
| December | 7.5° | 3.3° | 4° | 0 | 0 | 0 | 99 |
No. August daytime highs in Brussels average a comfortable 23.3°C with 2.4 days over 30°C — it's a solid summer choice for avoiding extreme heat.
Based on 5 years of climate data, the most comfortable months in Brussels are February, March, April. The toughest month for heat is January, scoring 95/100 on our heat-comfort index.
In August, nights in Brussels average a low of 14.8°C, with 0.2 tropical nights per month (nights that stay at or above 20°C) — a key factor for sleep quality if your stay has no air conditioning.
Tell us where and when you're going. If a heatwave becomes likely for your dates, we'll email you early — with cooler day-by-day alternatives nearby.