🔎 Weather for a date or period
Actual day-by-day weather for the selected period (ERA5). Up to 1 year.
📆 On this day before
Data for previous years is being prepared.
🏆 Hottest and coldest day in Brussels (over the full observation series)
+38°
Hottest day
July 25, 2019
-23°
Coldest day
February 17, 1956
🗓 Monthly climate in Brussels (10-year normals)
| Month | Day | Night | Precip |
|---|---|---|---|
| January | +6° | +2° | 73 mm |
| February | +9° | +2° | 64 mm |
| March | +11° | +4° | 69 mm |
| April | +14° | +5° | 45 mm |
| May | +18° | +9° | 63 mm |
| June | +22° | +13° | 72 mm |
| July | +23° | +15° | 73 mm |
| August | +24° | +15° | 61 mm |
| September | +20° | +12° | 62 mm |
| October | +16° | +9° | 68 mm |
| November | +10° | +5° | 69 mm |
| December | +8° | +4° | 73 mm |
🕰 Weather in Brussels September 21 in past years
+27°
Heat record · 2003
+5°
Cold record · 1986
📜
This day in history. The hottest September 21 in Brussels was in 2003 (+27°), the coldest in 1986 (+5°). 86 years of observations. Normal for September: day +20°, night +12°.
📒 For school and home
Weather diary
ready-made observation table for a month — for school
Weather for the month
September calendar: forecast + climate normal
Air quality
AQI 40 — good
FAQ about the weather archive in Brussels ❓
What was the weather in Brussels on a specific date?
Pick a date or range in the form above — we show actual day-by-day weather (ERA5 reanalysis, up to a year back). For today’s date in past years see “On this day before”.
Hottest and coldest day in the history in Brussels?
Heat record — +38° (July 25, 2019), cold record — -23° (February 17, 1956). Observations over the full available series.
What's the typical weather in Brussels in September?
On average +20° by day, +12° at night, precipitation about 62 mm (ERA5 climate normal).
Since what year is the weather archive in Brussels kept?
Climate normals and records come from the ERA5 reanalysis. Actual day-by-day weather is available for the last year.
Climate and weather archive in Brussels
Monthly climate normals in Brussels (average day and night temperatures, precipitation) are computed from the ERA5 reanalysis. The observation archive accrues from launch. Data: Open-Meteo (ERA5).