Weather in Brussels - 14-day forecast

Detailed weather forecast for Brussels, Belgium: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.

Forecast for the next days in Brussels

today☁️ 21°💧 0.6 mm

Sun☁️ 22°💧 0.8 mm

Mon☁️ 26°💧 3.3 mm

Tue🌧️ 19°💧 1.5 mm

Wed🌤️ 19°💧 7.1 mm

Thu🌧️ 18°💧 0.3 mm

Fri🌧️ 19°💧 4.1 mm

Sat☁️ 18°💧 5.2 mm

Forecast vs 1991-2020 climate normal

How does the current forecast compare with normal?

We compare the coming days with weather usually observed at this time of year.

NASA POWER

Monday 7 Sept in Brussels, the forecast high is 26°C. Typical daytime temperatures at this time of year range from 18°C to 24°C, so it will be exceptionally warm. It is warmer than 94% of similar days.

Saturday 5 Sept

21°Cnear normal

usually 19°C–24°C

night: exceptionally warm rain: typical rainfall wind: typical

Sunday 6 Sept

22°Cnear normal

usually 18°C–24°C

night: exceptionally warm rain: typical rainfall wind: exceptionally light

Monday 7 Sept

26°Cexceptionally warm

usually 18°C–24°C

warmer than 94% of similar days

night: exceptionally warm rain: more rain than usual wind: stronger than usual

Tuesday 8 Sept

19°Cnear normal

usually 18°C–23°C

night: warmer than usual rain: typical rainfall wind: typical

Wednesday 9 Sept

19°Cnear normal

usually 18°C–23°C

night: exceptionally warm rain: exceptionally wet wind: stronger than usual

Thursday 10 Sept

18°Ccooler than usual

usually 18°C–23°C

cooler than 80% of similar days

night: exceptionally warm rain: typical rainfall wind: typical

Friday 11 Sept

19°Cnear normal

usually 18°C–23°C

night: exceptionally warm rain: more rain than usual wind: stronger than usual

How warm was this week in previous years?

Each bar shows the average daily high during the same 7-day period in each year.

swipe to see more years →

cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 5-11 Sept period averaged 21°C by day. The coolest year was 1984 (16°C) and the warmest was 2023 (29°C). The current forecast averages 21°C - close to the historical median.

Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.

Weather warnings - Brussels

No active weather warnings for Brussels (region: Brabant). The national weather service is not forecasting dangerous conditions.

14-day forecast - Brussels

Brussels - 14-day weather forecast infographic

Brussels 30 & 45-day weather - long-range outlook

Next 16 days · forecast

22°

around 17° at night · days with rain: 8

Weeks 3-4 · avg for September

18°

around 10° at night · rain chance 46%

Weeks 5-7 · avg for October

14°

around 8° at night · rain chance 57%

The 30 & 45-day outlook for Brussels: the next 16 days are a numerical forecast updated daily - on average 22° by day and 17° at night. Further out we rely on multi-year climate averages: around 18° in September, and about 14° in October. Forecasts beyond two weeks are indicative only.

Day-by-day forecast for Brussels

Saturday5 September 2026

☁️21°broken clouds

sunrise 07:02 · sunset 20:20 · night 15° · evening 21° · rain 0.57 mm · humidity 47% · wind 6 m/s · clouds 59%

Sunday6 September 2026

☁️22°overcast clouds

sunrise 07:03 · sunset 20:18 · night 19° · evening 24° · rain 0.75 mm · humidity 42% · wind 3 m/s · clouds 100%

Monday7 September 2026

☁️26°broken clouds

sunrise 07:05 · sunset 20:16 · night 18° · evening 23° · rain 3.27 mm · humidity 40% · wind 7 m/s · clouds 82%

Tuesday8 September 2026

🌧️19°light rain

sunrise 07:06 · sunset 20:13 · night 13° · evening 17° · rain 1.49 mm · humidity 54% · wind 7 m/s · clouds 100%

Wednesday9 September 2026

🌤️19°scattered clouds

sunrise 07:08 · sunset 20:11 · night 15° · evening 17° · rain 7.08 mm · humidity 42% · wind 7 m/s · clouds 27%

Thursday10 September 2026

🌧️18°light rain

sunrise 07:09 · sunset 20:09 · night 17° · evening 19° · rain 0.33 mm · humidity 61% · wind 6 m/s · clouds 92%

Friday11 September 2026

🌧️19°light rain

sunrise 07:11 · sunset 20:07 · night 14° · evening 18° · rain 4.05 mm · humidity 80% · wind 7 m/s · clouds 97%

Saturday12 September 2026

☁️18°broken clouds

sunrise 07:13 · sunset 20:04 · night 14° · evening 16° · rain 5.22 mm · humidity 53% · wind 6 m/s · clouds 63%

Sunday13 September 2026

☁️20°broken clouds

sunrise 07:14 · sunset 20:02 · night 13° · evening 16° · rain 1.56 mm · humidity 47% · wind 4 m/s · clouds 59%

Monday14 September 2026

☀️21°clear sky

sunrise 07:16 · sunset 20:00 · night 14° · evening 17° · rain 1.62 mm · humidity 41% · wind 4 m/s · clouds 1%

Tuesday15 September 2026

🌧️19°light rain

sunrise 07:17 · sunset 19:58 · night 17° · evening 19° · rain 0.12 mm · humidity 46% · wind 3 m/s · clouds 69%

Wednesday16 September 2026

🌧️19°light rain

sunrise 07:19 · sunset 19:55 · night 17° · evening 19° · rain 0.54 mm · humidity 65% · wind 7 m/s · clouds 99%

Thursday17 September 2026

🌧️22°light rain

sunrise 07:20 · sunset 19:53 · night 16° · evening 18° · rain 0.27 mm · humidity 58% · wind 7 m/s · clouds 93%

Friday18 September 2026

🌤️26°a few clouds

sunrise 07:22 · sunset 19:51 · night 21° · evening 24° · rain 3.87 mm · humidity 51% · wind 6 m/s · clouds 22%

Saturday19 September 2026

☀️30°clear sky

sunrise 07:23 · sunset 19:49 · night 24° · evening 25° · humidity 30% · wind 6 m/s · clouds 7%

Sunday20 September 2026

☁️31°overcast clouds

sunrise 07:25 · sunset 19:46 · night 26° · evening 26° · humidity 37% · wind 4 m/s · clouds 90%

UV index in Brussels - is it safe to sunbathe?

Today the UV index in Brussels is 5 (moderate) - unprotected fair skin can burn in about 40 minutes. Seek shade around midday. SPF 30+, sunglasses and a hat for longer stays.

Pollen in Brussels - info for allergy sufferers

Brussels weather through the year

Warmest, driest months on average: May, June, July, August.

Upcoming public holidays in Belgium: All Saints' Day — 1 November · Armistice Day — 11 November · Christmas Day — 25 December.

Nearby and related places

Heist-op-den-BergLa LouvièreBastogneVerviersLiègeSpa

FAQ - Brussels weather

What is the weather like in Brussels today?

Today it is about 21° during the day and 15° at night, broken clouds.

How far ahead can I check the forecast for Brussels?

This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.