Today
Sun, Jun 21
Heavy rain
31°20°
- Rain chance
- 100%
- Precip
- 27.7 mm
- Max wind
- 21 km/h
Grimbergen weather forecast
Flanders, Belgium · Brussels time · 50.93°, 4.37°
Current conditions · 3:00 PM local
Current conditions in Grimbergen
30°C
Overcast
Feels like 35°C
- Humidity
- 55%
- Wind
- 8 km/h N
- Gusts
- 20 km/h
- UV index
- 6.4
- Visibility
- 28.1 km
Right now
Conditions in Grimbergen at the moment: overcast, 30 °C. It feels warmer than it reads, more like 34 °C. Wind is from the N at 8 km/h. Humidity stands at 55% with sea-level pressure near 1024 hPa.
At a glance
Today
31° / 20°Heavy rain · rain likely (100%)
Tomorrow
32° / 21°Overcast
Upcoming · to Saturday
37° / 22°A steady stretch: highs near 37°, lows around 22°, and no day above a 24% rain chance through Saturday.
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Next 3 days
Today looks like heavy rain; temperatures run from 20 °C up to 31 °C. Rain chance peaks at 100% with around 27.7 mm possible. Tomorrow brings overcast with a high of 32 °C and a low of 21 °C. Tuesday looks like overcast; temperatures run from 22 °C up to 35 °C.
Tomorrow
Mon, Jun 22
Overcast
32°21°
- Rain chance
- 0%
- Precip
- 0 mm
- Max wind
- 14 km/h
Tuesday
Tue, Jun 23
Overcast
35°22°
- Rain chance
- 2%
- Precip
- 0 mm
- Max wind
- 13 km/h
Next 48 hours
- 12 AM24°11%13 km/h
- 1 AM21°2%21 km/h
- 2 AM21°6%14 km/h
- 3 AM21°36%14 km/h
- 4 AM20°78%11 km/h
- 5 AM21°100%7 km/h
- 6 AM20°82%10 km/h
- 7 AM20°44%9 km/h
- 8 AM21°14%3 km/h
- 9 AM23°3%6 km/h
- 10 AM24°1%7 km/h
- 11 AM26°0%7 km/h
- 12 PM27°0%5 km/h
- 1 PM28°0%9 km/h
- 2 PM29°0%8 km/h
- 3 PM30°0%8 km/h
- 4 PM31°0%8 km/h
- 5 PM31°0%10 km/h
- 6 PM29°0%15 km/h
- 7 PM28°0%16 km/h
- 8 PM27°0%14 km/h
- 9 PM26°0%12 km/h
- 10 PM25°0%10 km/h
- 11 PM24°0%7 km/h
- 12 AM24°0%6 km/h
- 1 AM24°0%8 km/h
- 2 AM23°0%8 km/h
- 3 AM23°0%9 km/h
- 4 AM22°0%8 km/h
- 5 AM22°0%8 km/h
- 6 AM21°0%10 km/h
- 7 AM22°0%11 km/h
- 8 AM22°0%12 km/h
- 9 AM24°0%10 km/h
- 10 AM25°0%10 km/h
- 11 AM27°0%11 km/h
- 12 PM28°0%13 km/h
- 1 PM30°0%14 km/h
- 2 PM31°0%13 km/h
- 3 PM31°0%12 km/h
- 4 PM32°0%12 km/h
- 5 PM32°0%11 km/h
- 6 PM32°0%11 km/h
- 7 PM31°0%12 km/h
- 8 PM30°0%14 km/h
- 9 PM29°0%12 km/h
- 10 PM28°0%11 km/h
- 11 PM27°0%11 km/h
In depth
Across Grimbergen right now you'll find overcast and a temperature of 30 °C, with the apparent temperature at 34 °C. Today's forecast calls for heavy rain, topping out near 31 °C before falling back to 20 °C overnight. Winds blow mainly from the NNE around 21 km/h, with gusts up to 38 km/h. Daytime highs hold fairly steady this week, staying within 31 to 37 °C. Rain is in the picture on today, with roughly 28 mm expected in total across the week. Tomorrow brings overcast with a high of 32 °C and a 0% chance of precipitation. The UV index reaches 7 today, so sun protection is sensible during the middle of the day. Sunrise comes at 05:28 and sunset at 22:00, giving 16.5 hours of daylight. Current humidity sits at 55% with pressure near 1024 hPa. Looking further out, Thursday shows overcast with a high around 36 °C, while Saturday ends the week at 33 °C. Forecast details are refreshed throughout the day as new model runs arrive, so check back for the latest figures.
Air quality
38
Good
US AQI · European AQI 49
Air quality in Grimbergen is currently good, with a US AQI of 38 (European AQI 49). The dominant pollutant right now is ozone. Air quality is healthy; no precautions needed. Fine particulate matter (PM2.5) measures 10.6 µg/m³. Pollen in the air today: grass (moderate) — allergy sufferers take note.
Pollutants
- PM2.5
- 10.6 µg/m³
- PM10
- 14.1 µg/m³
- Ozone (O₃)
- 113 µg/m³
- NO₂
- 4 µg/m³
- SO₂
- 1.1 µg/m³
- CO
- 144 µg/m³
- Dust
- 2 µg/m³
Pollen
- Grass
- 36.5 gr/m³
- Birch
- 0 gr/m³
- Alder
- 0 gr/m³
- Olive
- 0.1 gr/m³
- Mugwort
- 1.2 gr/m³
- Ragweed
- 0 gr/m³
Sun & UV
- Sunrise
- 5:28 AM
- Sunset
- 10:00 PM
- Daylight
- 16h 32m
- Max UV
- 7 High
Wind
- Wind
- 8 km/h
- Gusts
- 20 km/h
- Direction
- N (354°)
Farming weather
Soil temperatures today read surface 22.3 °C, 6 cm 24.5 °C, 18 cm 24 °C, 54 cm 18.4 °C. Soil moisture sits at 0-1 cm at 0.26 m³/m³, 3-9 cm at 0.27 m³/m³, 27-81 cm at 0.3 m³/m³. For wheat, the root-zone reading is within the ideal 0.2-0.35 m³/m³ band. Reference evapotranspiration totals 47 mm against only 28 mm of expected rain — a 19 mm deficit, so irrigation will be needed this week. A suitable spraying window opens around 06:00 on 2026-06-21, with winds at or below 15 km/h and no rain expected. Heat stress is likely for wheat with highs reaching 37 °C (threshold 32 °C). Heat stress is likely for maize with highs reaching 37 °C (threshold 35 °C). Projected growing degree days over the next week: wheat 168, maize 129.
- Topsoil moisture
- 0.237 m³/m³
- Soil temp
- 22°C
- ET₀ today
- 5.65 mm
- Spray window
- ~5:00
- Rain (next 7d)
- 27.7 mm
- Wind
- 8 km/h
- Humidity
- 55%
Advisory summary
No weather alert thresholds are crossed for Grimbergen in the current forecast (derived from forecast data, not official warnings). Conditions may still change — check back for updates.
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All data for Grimbergen
| Variable | Value |
|---|---|
| City | Grimbergen, Flanders, Belgium |
| Coordinates | 50.93409, 4.37213 |
| Elevation | 29 m |
| Timezone | Europe/Brussels |
| Population | 37,000 |
| Observed at (local) | 3:00 PM |
| Temperature (2 m) | 30°C |
| Apparent temperature | 35°C |
| Relative humidity (2 m) | 55% |
| Dew point (2 m) | 20°C |
| Precipitation (last hour) | 0 mm |
| Rain | 0 mm |
| Showers | 0 mm |
| Snowfall | 0 cm |
| Weather code (WMO) | 3 |
| Cloud cover | 94% |
| Surface pressure | 1021 hPa |
| Sea-level pressure | 1024 hPa |
| Wind speed (10 m) | 8 km/h |
| Wind gusts (10 m) | 20 km/h |
| Wind direction (10 m) | 354° (N) |
| Visibility | 28.1 km |
| UV index | 6.4 |
| Day / night | Day |
| Today max / min | 31°C / 20°C |
| Today feels-like max / min | 35°C / 21°C |
| Today precipitation sum | 27.7 mm |
| Today rain sum | 27.7 mm |
| Today snowfall sum | 0 cm |
| Today max precip probability | 100% |
| Today max wind / gusts | 21 km/h / 38 km/h |
| Dominant wind direction | 21° (NNE) |
| Sunrise / sunset | 5:28 AM / 10:00 PM |
| Daylight duration | 16h 32m |
| Sunshine duration | 14h 52m |
| Max UV index | 7 |
| Reference evapotranspiration (ET₀) | 5.65 mm |
| Topsoil moisture (0–1 cm) | 0.237 m³/m³ |
| Surface soil temperature | 22°C |
| US AQI | 38 |
| European AQI | 49 |
| PM2.5 | 10.6 µg/m³ |
| PM10 | 14.1 µg/m³ |
| Ozone (O₃) | 113 µg/m³ |
| Nitrogen dioxide (NO₂) | 4 µg/m³ |
| Sulphur dioxide (SO₂) | 1.1 µg/m³ |
| Carbon monoxide (CO) | 144 µg/m³ |
| Dust | 2 µg/m³ |
| Alder pollen | 0 gr/m³ |
| Birch pollen | 0 gr/m³ |
| Grass pollen | 36.5 gr/m³ |
| Mugwort pollen | 1.2 gr/m³ |
| Olive pollen | 0.1 gr/m³ |
| Ragweed pollen | 0 gr/m³ |
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<iframe src="https://weathertomorrow.cloud/embed/city/be/flanders/grimbergen" width="320" height="180" frameborder="0" title="Grimbergen weather" loading="lazy"></iframe>Frequently asked questions
Will it rain in Grimbergen tomorrow?
Rain is unlikely in Grimbergen tomorrow; the precipitation chance stays around 0%.
What is the temperature in Grimbergen today?
Today Grimbergen sees heavy rain with a high of 31 °C and a low of 20 °C.
How hot will it be in Grimbergen tomorrow?
Tomorrow's high in Grimbergen is forecast at 32 °C with overcast.
Is it windy in Grimbergen today?
No, not especially; gusts only reach up to 38 km/h today.
What is the UV index in Grimbergen today?
The UV index peaks at 7 today, which is high.
What time is sunrise and sunset in Grimbergen today?
The sun rises at 05:28 and sets at 22:00 local time.
Is the air quality in Grimbergen good today?
Air quality is good right now, with a US AQI reading of 38.