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Weather in Zemst
Flemish Brabant, 9 m · continuously updated
Zaventem (Melsbroek) (11 km) · 10 °C · KMI/IRM 14:00
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Temperature · last 4 and next 28 hours
Zemst weather: the next 24 hours
Updated hourly.
Zemst 15-day forecast
Two-week trend.
Sun and golden hours
Sunrise –, golden light until –
Sunset –, golden light from –
–
Air quality
European index, modelled by Copernicus (CAMS).
UV index
Daily maximum — protection advised from 3.
Freezing level
Snow settles about 300 m below it.
Around Zemst
Neighbouring towns, as the crow flies.
Official weather warnings
No active warning for Flemish Brabant.
Updated 15 Nov 13:48.
Is there an active weather warning for Zemst?
No active warning for Flemish Brabant.
Latest RMI observation near Zemst
Measured at Zaventem (Melsbroek), 11 km from Zemst: situation as of 15 November 2026, 14:00. Zaventem (Melsbroek) is the nearest weather station of the RMI/KMI (Royal Meteorological Institute of Belgium), one of the country's 28 synoptic stations. These are measured values, not a forecast; this page is refreshed three times a day, hence the time shown.
| Situation as of | 15 November 2026, 14:00 |
|---|---|
| Temperature | 9.5 °C |
| Wind | 29 km/h S |
| Gusts | 40 km/h |
| Rain, last hour | — |
| Humidity | — |
| Pressure | 1003 hPa |
Observations from the 28 RMI stations
Source: RMI/KMI (Royal Meteorological Institute of Belgium), open observation data, Creative Commons Attribution 4.0 (CC BY 4.0) licence. The RMI is not liable for any damage resulting from the use of these data. Raw, unvalidated data shown as published, with wind converted from m/s to km/h. Data: opendata.meteo.be · CC BY 4.0
The observed climate near Zemst
The weather station nearest to Zemst, Uccle located 104 m above sea level, is 22 km away; its records cover 1795–2025. In November, the mean temperature there is 7.3 °C over 1991–2020, 1.0 °C more than over 1961–1990 (6.3 °C), with about – mm of rain. The warmest month ever measured is July 2006 (23.5 °C), the coldest February 1956 (−6.2 °C). See the full series of Uccle
Today in Zemst
- No washing outside today: rain, or a risk of rain, covers the hours when it could dry. How it is calculated
- Terrace and barbecue between 18:00 and 23:00: rain likely (1.6 mm, up to 86 % chance). Have some shelter or a plan B ready. How it is calculated
- Best time to air the house: tomorrow, between 11:00 and 14:00. The outdoor dew point drops to 4.7 °C; once warmed to 20 °C, that air holds only 37 % humidity, against 50 % in a typical home: opening the windows dries the house. How it is calculated
- Garden: 26.3 mm of rain expected within 48 h, against a need of 1.1 mm. No need to water, the rain will do it. How it is calculated
Calculated from Open-Meteo forecasts of 2026-11-15 14:48 (local time): model values, not measurements. All of today's advice
7-day forecast for Zemst
Today (Sunday 15 Nov) in Zemst: light rain, 0 to 11 °C, precipitation 3.2 mm (86 %), wind up to 22 km/h. Tomorrow: rain, 4 to 10 °C.
| Day | Weather | Min | Max | Precip. | Wind |
|---|---|---|---|---|---|
| Today | light rain | 0 °C | 11 °C | 3.2 mm | 22 km/h |
| Tomorrow | rain | 4 °C | 10 °C | 5.6 mm | 28 km/h |
| Tue 17 Nov | rain | 4 °C | 14 °C | 20.4 mm | 37 km/h |
| Wed 18 Nov | drizzle | 9 °C | 12 °C | 2.3 mm | 23 km/h |
| Thu 19 Nov | showers | 8 °C | 11 °C | 13.5 mm | 20 km/h |
| Fri 20 Nov | showers | 2 °C | 8 °C | 21.7 mm | 14 km/h |
| Sat 21 Nov | overcast | 1 °C | 10 °C | 0.0 mm | 10 km/h |
Tomorrow's weather in Zemst
Tomorrow, Monday 16 Nov, in Zemst: rain, from 4 to 10 °C, 5.6 mm of precipitation (probability 56 %), wind up to 28 km/h.
| Hour | Weather | Temp. | Precip. | Chance | Wind |
|---|---|---|---|---|---|
| 00:00 |  overcast | 10 °C | 0.0 mm | 56 % | 16 km/h |
| 03:00 |  light drizzle | 9 °C | 0.2 mm | 50 % | 17 km/h |
| 06:00 | light drizzle | 8 °C | 0.4 mm | 52 % | 22 km/h |
| 09:00 | overcast | 8 °C | 0.0 mm | 42 % | 23 km/h |
| 12:00 | overcast | 8 °C | 0.0 mm | 27 % | 24 km/h |
| 15:00 |  sunny | 7 °C | 0.0 mm | 13 % | 20 km/h |
| 18:00 | overcast | 5 °C | 0.0 mm | 11 % | 16 km/h |
| 21:00 | overcast | 4 °C | 0.0 mm | 22 % | 8 km/h |
Frequently asked questions
Will it rain tomorrow in Zemst?
Yes: 5.6 mm expected, probability 56 %.
How warm will it be tomorrow in Zemst?
Between 4 and 10 °C.
The weekend
Today, Sunday, in Zemst: light rain, 0 to 11 °C. Next weekend: Saturday overcast, 1 to 10 °C, Sunday drizzle, 4 to 9 °C.
| Day | Weather | Min | Max | Precip. | Wind |
|---|---|---|---|---|---|
| Today |  light rain | 0 °C | 11 °C | 3.2 mm | 22 km/h |
| Sat 21 Nov | overcast | 1 °C | 10 °C | 0.0 mm | 10 km/h |
| Sun 22 Nov | drizzle | 4 °C | 9 °C | 6.0 mm | 20 km/h |
Hour by hour
The next 48 hours in Zemst, hour by hour: temperature from 4 to 13 °C, 26.3 mm of rain expected.
| Hour | Weather | Temp. | Precip. | Chance | Wind |
|---|---|---|---|---|---|
| 14:00 | overcast | 9 °C | 0.0 mm | 9 % | 18 km/h |
| 15:00 | overcast | 10 °C | 0.0 mm | 20 % | 20 km/h |
| 16:00 | light drizzle | 10 °C | 0.4 mm | 33 % | 17 km/h |
| 17:00 | heavy drizzle | 10 °C | 1.0 mm | 52 % | 15 km/h |
| 18:00 | light rain | 10 °C | 1.3 mm | 73 % | 18 km/h |
| 19:00 | light drizzle | 11 °C | 0.3 mm | 86 % | 22 km/h |
| 20:00 | overcast | 11 °C | 0.0 mm | 86 % | 18 km/h |
| 21:00 | overcast | 11 °C | 0.0 mm | 79 % | 19 km/h |
| 22:00 | overcast | 10 °C | 0.0 mm | 71 % | 19 km/h |
| 23:00 | overcast | 10 °C | 0.0 mm | 64 % | 18 km/h |
| 00:00 | overcast | 10 °C | 0.0 mm | 56 % | 16 km/h |
| 01:00 | overcast | 10 °C | 0.0 mm | 51 % | 18 km/h |
| 02:00 | light drizzle | 10 °C | 0.1 mm | 50 % | 19 km/h |
| 03:00 | light drizzle | 9 °C | 0.2 mm | 50 % | 17 km/h |
| 04:00 | rain | 9 °C | 3.2 mm | 51 % | 20 km/h |
| 05:00 | light rain | 9 °C | 1.5 mm | 52 % | 27 km/h |
| 06:00 | light drizzle | 8 °C | 0.4 mm | 52 % | 22 km/h |
| 07:00 | light drizzle | 8 °C | 0.2 mm | 51 % | 23 km/h |
| 08:00 | overcast | 8 °C | 0.0 mm | 47 % | 28 km/h |
| 09:00 | overcast | 8 °C | 0.0 mm | 42 % | 23 km/h |
| 10:00 | overcast | 8 °C | 0.0 mm | 37 % | 24 km/h |
| 11:00 | overcast | 7 °C | 0.0 mm | 32 % | 23 km/h |
| 12:00 | overcast | 8 °C | 0.0 mm | 27 % | 24 km/h |
| 13:00 | overcast | 8 °C | 0.0 mm | 22 % | 23 km/h |
| 14:00 | mostly sunny | 7 °C | 0.0 mm | 17 % | 23 km/h |
| 15:00 | sunny | 7 °C | 0.0 mm | 13 % | 20 km/h |
| 16:00 | sunny | 7 °C | 0.0 mm | 10 % | 17 km/h |
| 17:00 | overcast | 6 °C | 0.0 mm | 10 % | 15 km/h |
| 18:00 | overcast | 5 °C | 0.0 mm | 11 % | 16 km/h |
| 19:00 | overcast | 4 °C | 0.0 mm | 14 % | 13 km/h |
| 20:00 | overcast | 4 °C | 0.0 mm | 17 % | 9 km/h |
| 21:00 | overcast | 4 °C | 0.0 mm | 22 % | 8 km/h |
| 22:00 | overcast | 4 °C | 0.0 mm | 27 % | 6 km/h |
| 23:00 | overcast | 4 °C | 0.0 mm | 33 % | 6 km/h |
| 00:00 | light drizzle | 4 °C | 0.3 mm | 39 % | 7 km/h |
| 01:00 | heavy drizzle | 4 °C | 1.1 mm | 45 % | 8 km/h |
| 02:00 | light rain | 4 °C | 1.7 mm | 50 % | 9 km/h |
| 03:00 | light rain | 4 °C | 1.5 mm | 54 % | 16 km/h |
| 04:00 | light rain | 4 °C | 1.3 mm | 59 % | 18 km/h |
| 05:00 | rain | 5 °C | 3.4 mm | 66 % | 20 km/h |
| 06:00 | rain | 5 °C | 2.6 mm | 74 % | 19 km/h |
| 07:00 | rain | 5 °C | 3.5 mm | 80 % | 17 km/h |
| 08:00 | drizzle | 6 °C | 0.9 mm | 83 % | 14 km/h |
| 09:00 | light drizzle | 6 °C | 0.3 mm | 85 % | 8 km/h |
| 10:00 | light drizzle | 6 °C | 0.1 mm | 86 % | 4 km/h |
| 11:00 | overcast | 6 °C | 0.0 mm | 88 % | 5 km/h |
| 12:00 | drizzle | 12 °C | 0.7 mm | 90 % | 22 km/h |
| 13:00 | light drizzle | 13 °C | 0.3 mm | 90 % | 25 km/h |
Location of Zemst
Zemst lies at 9 m, 32 m below the average of the 63 places we cover in the province of Flemish Brabant (41 m). That makes it the lowest of the 63. The main town, Leuven, lies 20 km to the south-east. The nearest places we cover are Mechelen (5 km to the north), Vilvoorde (6 km to the south), Grimbergen (7 km to the south-west) and Kapelle-op-den-Bos (8 km to the west). With about 23,358 inhabitants according to GeoNames, Zemst is the 14th largest of the 62 places we cover in the province of Flemish Brabant. Of the places of interest on this site, the nearest are Atomium (sight, 13 km to the south-west) and Boom, Tomorrowland (circuit or festival, 14 km to the north-west).
Today is close to the November normal (10.4 °C).
Climate of Zemst: 1991–2020 normals
In Zemst, July is typically the warmest month (up to 24.0 °C on average), while February is the coldest at 1.7 °C. August sees the most rain, with around 90 mm.
By season (average highs, 1991–2020 normals): winter 7.1 °C and 221 mm of rain, spring 15.5 °C and 158 mm, summer 23.2 °C and 244 mm, autumn 15.3 °C and 206 mm. The wettest season is summer (29 % of the annual total), the driest spring (19 %).
| Max T (°C) | Min T (°C) | Rainfall (mm) | Rainy days | |
|---|---|---|---|---|
| January | 6.6 | 1.8 | 74 | 13 |
| February | 7.7 | 1.7 | 63 | 12 |
| March | 11.6 | 3.8 | 54 | 12 |
| April | 15.6 | 6.4 | 45 | 11 |
| May | 19.2 | 9.9 | 58 | 12 |
| June | 21.9 | 12.9 | 72 | 12 |
| July | 24.0 | 14.9 | 82 | 13 |
| August | 23.6 | 14.5 | 90 | 13 |
| September | 20.2 | 11.6 | 65 | 11 |
| October | 15.4 | 8.4 | 70 | 12 |
| November | 10.4 | 4.8 | 71 | 13 |
| December | 6.9 | 2.3 | 84 | 14 |
Compared with Leuven, the main town 20 km to the south-east, highs in the warmest month are 0.1 °C higher here, and the year brings 13 mm less precipitation. In no month does the average low fall below 0 °C; in 4 months the average high exceeds 20 °C (June, July, August and September).
The nearest neighbouring places, Vilvoorde, Kapelle-op-den-Bos and Boortmeerbeek, have almost identical normals. Among the 63 places we cover in the province of Flemish Brabant whose normals come from the ERA5 reanalysis, Zemst ranks 4th for summer warmth and 47th for annual precipitation. The warmest summers are in Rotselaar, Haacht and Boortmeerbeek and the coolest in Landen; the wettest year is in Hoegaarden and the driest in Geetbets.
What is the warmest month in Zemst?
The warmest month in Zemst is typically July, averaging 24.0 °C (1991–2020 normal). The coldest is February, at 1.7 °C.
How many rainy days does Zemst get per year?
Zemst sees about 148 rainy days a year, adding up to roughly 828 mm of rainfall (1991–2020 normals).
How big is the gap between summer and winter in Zemst?
Between July and February, the temperature gap in Zemst runs to about 22.3 °C, based on the 1991–2020 normals.