Verdict: Tough month
Brussels Weather in December
December is properly cold in Brussels, with highs of only 7°C (45°F). It's also the wet side of the calendar: rain falls on about 15 days, so build flexibility into plans. If your dates are flexible, most travelers will have a better time in Brussels outside December.
Average high
7°C / 45°F
Average low
3°C / 37°F
Rain days
~15
Precipitation
79 mm
What to pack for Brussels in December
- A proper warm jacket, and a hat for mornings
- Rain gear is non-negotiable — expect rain on roughly 15 days
- Comfortable walking shoes — every guide on this site assumes you'll use them
December against the rest of the year
Warmest in Brussels: Aug (24°C / 75°F) · Coolest: Jan (7°C / 45°F) · Wettest: Dec (~15 rain days)
7°
2°
Jan
9°
3°
Feb
11°
4°
Mar
14°
5°
Apr
18°
9°
May
22°
13°
Jun
22°
14°
Jul
24°
15°
Aug
21°
12°
Sep
16°
10°
Oct
10°
5°
Nov
7°
3°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)