Today
Sun, Jun 21
Moderate rain
29°19°
- Rain chance
- 100%
- Precip
- 12.3 mm
- Max wind
- 13 km/h
Kalmthout air quality
Flanders, Belgium · Brussels time · 51.38°, 4.48°
Current conditions · 3:00 PM local
Current conditions in Kalmthout
28°C
Clear sky
Feels like 32°C
- Humidity
- 61%
- Wind
- 8 km/h NE
- Gusts
- 21 km/h
- UV index
- 5.85
- Visibility
- 24.3 km
Air quality
33
Good
US AQI · European AQI 47
Air quality in Kalmthout is currently good, with a US AQI of 33 (European AQI 47). The dominant pollutant right now is ozone. Air quality is healthy; no precautions needed. Fine particulate matter (PM2.5) measures 7.1 µg/m³. Pollen in the air today: grass (moderate) — allergy sufferers take note.
Pollutants
- PM2.5
- 7.1 µg/m³
- PM10
- 10.2 µg/m³
- Ozone (O₃)
- 110 µg/m³
- NO₂
- 3.6 µg/m³
- SO₂
- 0.5 µg/m³
- CO
- 146 µg/m³
- Dust
- 2 µg/m³
Pollen
- Grass
- 28.2 gr/m³
- Birch
- 0 gr/m³
- Alder
- 0 gr/m³
- Olive
- 0 gr/m³
- Mugwort
- 1 gr/m³
- Ragweed
- 0 gr/m³
AQI computed from the CAMS air quality model via Open-Meteo. Bands follow the US EPA scale.
Right now
Kalmthout is currently seeing clear sky, with 28 °C on the thermometer. It feels warmer than it reads, more like 32 °C. Wind is from the NE at 8 km/h. Humidity stands at 61% with sea-level pressure near 1024 hPa.
At a glance
Today
29° / 19°Moderate rain · rain likely (100%)
Tomorrow
30° / 19°Overcast
Upcoming · to Saturday
37° / 20°A steady stretch: highs near 37°, lows around 20°, and no day above a 25% rain chance through Saturday.
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Next 3 days
Today brings moderate rain with a high of 29 °C and a low of 19 °C. Rain chance peaks at 100% with around 12.3 mm possible. Tomorrow brings overcast with a high of 30 °C and a low of 19 °C. Tuesday looks like overcast; temperatures run from 20 °C up to 32 °C.
Tomorrow
Mon, Jun 22
Overcast
30°19°
- Rain chance
- 0%
- Precip
- 0 mm
- Max wind
- 12 km/h
Tuesday
Tue, Jun 23
Overcast
32°20°
- Rain chance
- 2%
- Precip
- 0 mm
- Max wind
- 10 km/h
Next 48 hours
- 12 AM21°23%8 km/h
- 1 AM21°26%7 km/h
- 2 AM21°35%10 km/h
- 3 AM20°59%13 km/h
- 4 AM19°88%6 km/h
- 5 AM20°100%5 km/h
- 6 AM19°79%6 km/h
- 7 AM19°40%4 km/h
- 8 AM20°10%1 km/h
- 9 AM21°0%2 km/h
- 10 AM24°0%2 km/h
- 11 AM25°0%4 km/h
- 12 PM26°0%8 km/h
- 1 PM27°0%8 km/h
- 2 PM28°0%8 km/h
- 3 PM28°3%8 km/h
- 4 PM29°8%8 km/h
- 5 PM29°10%8 km/h
- 6 PM29°8%8 km/h
- 7 PM28°3%9 km/h
- 8 PM27°0%9 km/h
- 9 PM26°0%8 km/h
- 10 PM25°0%7 km/h
- 11 PM24°0%9 km/h
- 12 AM23°0%8 km/h
- 1 AM22°0%9 km/h
- 2 AM21°0%9 km/h
- 3 AM21°0%9 km/h
- 4 AM20°0%9 km/h
- 5 AM19°0%10 km/h
- 6 AM19°0%10 km/h
- 7 AM19°0%12 km/h
- 8 AM20°0%12 km/h
- 9 AM21°0%10 km/h
- 10 AM23°0%8 km/h
- 11 AM24°0%9 km/h
- 12 PM26°0%10 km/h
- 1 PM28°0%10 km/h
- 2 PM29°0%10 km/h
- 3 PM29°0%9 km/h
- 4 PM30°0%9 km/h
- 5 PM30°0%10 km/h
- 6 PM30°0%9 km/h
- 7 PM29°0%10 km/h
- 8 PM28°0%12 km/h
- 9 PM26°0%12 km/h
- 10 PM25°0%9 km/h
- 11 PM24°0%9 km/h
In depth
Kalmthout starts the period under clear sky, with the mercury at 28 °C and a feels-like of 32 °C. Today's forecast calls for moderate rain, topping out near 29 °C before falling back to 19 °C overnight. Winds blow mainly from the NE around 13 km/h, with gusts up to 23 km/h. A warming trend takes daytime highs from 29 to 37 °C over the coming week. Rain is in the picture on today, with roughly 13 mm expected in total across the week. Tomorrow brings overcast with a high of 30 °C and a 0% chance of precipitation. The UV index reaches 6 today, so sun protection is sensible during the middle of the day. Sunrise comes at 05:25 and sunset at 22:02, giving 16.6 hours of daylight. Current humidity sits at 61% with pressure near 1024 hPa. Looking further out, Thursday shows overcast with a high around 36 °C, while Saturday ends the week at 32 °C. Forecast details are refreshed throughout the day as new model runs arrive, so check back for the latest figures.
Sun & UV
- Sunrise
- 5:25 AM
- Sunset
- 10:02 PM
- Daylight
- 16h 37m
- Max UV
- 6.3 High
Wind
- Wind
- 8 km/h
- Gusts
- 21 km/h
- Direction
- NE (35°)
Farming weather
Soil temperatures today read surface 21.4 °C, 6 cm 23.8 °C, 18 cm 24.4 °C, 54 cm 20.1 °C. Soil moisture sits at 0-1 cm at 0.15 m³/m³, 3-9 cm at 0.16 m³/m³, 27-81 cm at 0.17 m³/m³. For wheat, the root-zone reading is below the ideal 0.2-0.35 m³/m³ band. Reference evapotranspiration totals 44 mm against only 13 mm of expected rain — a 32 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 158, maize 120.
- Topsoil moisture
- 0.142 m³/m³
- Soil temp
- 20°C
- ET₀ today
- 5.23 mm
- Spray window
- ~5:00
- Rain (next 7d)
- 12.6 mm
- Wind
- 8 km/h
- Humidity
- 61%
Advisory summary
No weather alert thresholds are crossed for Kalmthout 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 Kalmthout
| Variable | Value |
|---|---|
| City | Kalmthout, Flanders, Belgium |
| Coordinates | 51.38442, 4.47556 |
| Elevation | 21 m |
| Timezone | Europe/Brussels |
| Population | 17,485 |
| Observed at (local) | 3:00 PM |
| Temperature (2 m) | 28°C |
| Apparent temperature | 32°C |
| Relative humidity (2 m) | 61% |
| Dew point (2 m) | 20°C |
| Precipitation (last hour) | 0 mm |
| Rain | 0 mm |
| Showers | 0 mm |
| Snowfall | 0 cm |
| Weather code (WMO) | 0 |
| Cloud cover | 13% |
| Surface pressure | 1022 hPa |
| Sea-level pressure | 1025 hPa |
| Wind speed (10 m) | 8 km/h |
| Wind gusts (10 m) | 21 km/h |
| Wind direction (10 m) | 35° (NE) |
| Visibility | 24.3 km |
| UV index | 5.85 |
| Day / night | Day |
| Today max / min | 29°C / 19°C |
| Today feels-like max / min | 33°C / 21°C |
| Today precipitation sum | 12.3 mm |
| Today rain sum | 12.3 mm |
| Today snowfall sum | 0 cm |
| Today max precip probability | 100% |
| Today max wind / gusts | 13 km/h / 23 km/h |
| Dominant wind direction | 40° (NE) |
| Sunrise / sunset | 5:25 AM / 10:02 PM |
| Daylight duration | 16h 37m |
| Sunshine duration | 14h 51m |
| Max UV index | 6.3 |
| Reference evapotranspiration (ET₀) | 5.23 mm |
| Topsoil moisture (0–1 cm) | 0.142 m³/m³ |
| Surface soil temperature | 20°C |
| US AQI | 33 |
| European AQI | 47 |
| PM2.5 | 7.1 µg/m³ |
| PM10 | 10.2 µg/m³ |
| Ozone (O₃) | 110 µg/m³ |
| Nitrogen dioxide (NO₂) | 3.6 µg/m³ |
| Sulphur dioxide (SO₂) | 0.5 µg/m³ |
| Carbon monoxide (CO) | 146 µg/m³ |
| Dust | 2 µg/m³ |
| Alder pollen | 0 gr/m³ |
| Birch pollen | 0 gr/m³ |
| Grass pollen | 28.2 gr/m³ |
| Mugwort pollen | 1 gr/m³ |
| Olive pollen | 0 gr/m³ |
| Ragweed pollen | 0 gr/m³ |
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<iframe src="https://weathertomorrow.cloud/embed/city/be/flanders/kalmthout" width="320" height="180" frameborder="0" title="Kalmthout weather" loading="lazy"></iframe>Frequently asked questions
Will it rain in Kalmthout tomorrow?
Rain is unlikely in Kalmthout tomorrow; the precipitation chance stays around 0%.
What is the temperature in Kalmthout today?
Today Kalmthout sees moderate rain with a high of 29 °C and a low of 19 °C.
How hot will it be in Kalmthout tomorrow?
Tomorrow's high in Kalmthout is forecast at 30 °C with overcast.
Is it windy in Kalmthout today?
No, not especially; gusts only reach up to 23 km/h today.
What is the UV index in Kalmthout today?
The UV index peaks at 6 today, which is high.
What time is sunrise and sunset in Kalmthout today?
The sun rises at 05:25 and sets at 22:02 local time.
Is the air quality in Kalmthout good today?
Air quality is good right now, with a US AQI reading of 33.