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Weather in Zwalm
East Flanders, 42 m · continuously updated
Semmerzake (8 km) · 9 °C · KMI/IRM 14:00
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Temperature · last 4 and next 28 hours
Zwalm weather: the next 24 hours
Updated hourly.
Zwalm 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 Zwalm
Neighbouring towns, as the crow flies.
Official weather warnings
No active warning for East Flanders.
Updated 15 Nov 13:48.
Is there an active weather warning for Zwalm?
No active warning for East Flanders.
Latest RMI observation near Zwalm
Measured at Semmerzake, 8 km from Zwalm: situation as of 15 November 2026, 14:00. Semmerzake 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 | 8.8 °C |
| Wind | 18 km/h S |
| Gusts | 36 km/h |
| Rain, last hour | — |
| Humidity | — |
| Pressure | 1002 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
Today in Zwalm
- 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 (1.2 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 12:00 and 14:00. The outdoor dew point drops to 3.2 °C; once warmed to 20 °C, that air holds only 33 % humidity, against 50 % in a typical home: opening the windows dries the house. How it is calculated
- Garden: 23 mm of rain expected within 48 h, against a need of 0.9 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 Zwalm
Today (Sunday 15 Nov) in Zwalm: light rain, 1 to 10 °C, precipitation 4.0 mm (86 %), wind up to 31 km/h. Tomorrow: light rain, 2 to 9 °C.
| Day | Weather | Min | Max | Precip. | Wind |
|---|---|---|---|---|---|
| Today | light rain | 1 °C | 10 °C | 4.0 mm | 31 km/h |
| Tomorrow | light rain | 2 °C | 9 °C | 3.5 mm | 29 km/h |
| Tue 17 Nov | rain | 4 °C | 13 °C | 17.9 mm | 46 km/h |
| Wed 18 Nov | light drizzle | 8 °C | 11 °C | 2.6 mm | 24 km/h |
| Thu 19 Nov | showers | 7 °C | 10 °C | 11.7 mm | 24 km/h |
| Fri 20 Nov | showers | 2 °C | 8 °C | 10.9 mm | 19 km/h |
| Sat 21 Nov | overcast | 1 °C | 10 °C | 0.0 mm | 13 km/h |
Tomorrow's weather in Zwalm
Tomorrow, Monday 16 Nov, in Zwalm: light rain, from 2 to 9 °C, 3.5 mm of precipitation (probability 59 %), wind up to 29 km/h.
| Hour | Weather | Temp. | Precip. | Chance | Wind |
|---|---|---|---|---|---|
| 00:00 |  light drizzle | 9 °C | 0.2 mm | 49 % | 19 km/h |
| 03:00 | drizzle | 9 °C | 0.7 mm | 55 % | 26 km/h |
| 06:00 | light drizzle | 8 °C | 0.1 mm | 54 % | 22 km/h |
| 09:00 |  overcast | 7 °C | 0.0 mm | 36 % | 22 km/h |
| 12:00 | overcast | 7 °C | 0.0 mm | 16 % | 24 km/h |
| 15:00 | overcast | 7 °C | 0.0 mm | 10 % | 19 km/h |
| 18:00 | overcast | 3 °C | 0.0 mm | 13 % | 14 km/h |
| 21:00 | overcast | 3 °C | 0.0 mm | 29 % | 6 km/h |
Frequently asked questions
Will it rain tomorrow in Zwalm?
Yes: 3.5 mm expected, probability 59 %.
How warm will it be tomorrow in Zwalm?
Between 2 and 9 °C.
The weekend
Today, Sunday, in Zwalm: light rain, 1 to 10 °C. Next weekend: Saturday overcast, 1 to 10 °C, Sunday heavy drizzle, 5 to 9 °C.
| Day | Weather | Min | Max | Precip. | Wind |
|---|---|---|---|---|---|
| Today |  light rain | 1 °C | 10 °C | 4.0 mm | 31 km/h |
| Sat 21 Nov | overcast | 1 °C | 10 °C | 0.0 mm | 13 km/h |
| Sun 22 Nov | heavy drizzle | 5 °C | 9 °C | 7.2 mm | 24 km/h |
Hour by hour
The next 48 hours in Zwalm, hour by hour: temperature from 2 to 13 °C, 23.0 mm of rain expected.
| Hour | Weather | Temp. | Precip. | Chance | Wind |
|---|---|---|---|---|---|
| 14:00 | overcast | 8 °C | 0.0 mm | 22 % | 23 km/h |
| 15:00 | light drizzle | 8 °C | 0.2 mm | 49 % | 27 km/h |
| 16:00 | light rain | 9 °C | 1.4 mm | 71 % | 31 km/h |
| 17:00 | heavy drizzle | 9 °C | 1.2 mm | 81 % | 19 km/h |
| 18:00 | heavy drizzle | 10 °C | 1.2 mm | 86 % | 20 km/h |
| 19:00 | overcast | 10 °C | 0.0 mm | 86 % | 20 km/h |
| 20:00 | overcast | 10 °C | 0.0 mm | 82 % | 22 km/h |
| 21:00 | overcast | 9 °C | 0.0 mm | 73 % | 20 km/h |
| 22:00 | overcast | 10 °C | 0.0 mm | 65 % | 22 km/h |
| 23:00 | overcast | 9 °C | 0.0 mm | 57 % | 18 km/h |
| 00:00 | light drizzle | 9 °C | 0.2 mm | 49 % | 19 km/h |
| 01:00 | light drizzle | 9 °C | 0.1 mm | 45 % | 19 km/h |
| 02:00 | overcast | 8 °C | 0.0 mm | 48 % | 19 km/h |
| 03:00 | drizzle | 9 °C | 0.7 mm | 55 % | 26 km/h |
| 04:00 | light rain | 9 °C | 1.6 mm | 59 % | 29 km/h |
| 05:00 | light drizzle | 8 °C | 0.3 mm | 58 % | 27 km/h |
| 06:00 | light drizzle | 8 °C | 0.1 mm | 54 % | 22 km/h |
| 07:00 | light drizzle | 8 °C | 0.3 mm | 49 % | 27 km/h |
| 08:00 | overcast | 7 °C | 0.0 mm | 43 % | 24 km/h |
| 09:00 | overcast | 7 °C | 0.0 mm | 36 % | 22 km/h |
| 10:00 | overcast | 7 °C | 0.0 mm | 29 % | 23 km/h |
| 11:00 | overcast | 7 °C | 0.0 mm | 23 % | 20 km/h |
| 12:00 | overcast | 7 °C | 0.0 mm | 16 % | 24 km/h |
| 13:00 | overcast | 6 °C | 0.0 mm | 12 % | 24 km/h |
| 14:00 |  partly cloudy | 7 °C | 0.0 mm | 10 % | 21 km/h |
| 15:00 | overcast | 7 °C | 0.0 mm | 10 % | 19 km/h |
| 16:00 |  mostly sunny | 6 °C | 0.0 mm | 10 % | 17 km/h |
| 17:00 | overcast | 4 °C | 0.0 mm | 11 % | 13 km/h |
| 18:00 | overcast | 3 °C | 0.0 mm | 13 % | 14 km/h |
| 19:00 | overcast | 2 °C | 0.0 mm | 16 % | 10 km/h |
| 20:00 | overcast | 3 °C | 0.0 mm | 22 % | 8 km/h |
| 21:00 | overcast | 3 °C | 0.0 mm | 29 % | 6 km/h |
| 22:00 | overcast | 3 °C | 0.0 mm | 35 % | 7 km/h |
| 23:00 | light drizzle | 3 °C | 0.2 mm | 40 % | 9 km/h |
| 00:00 | light rain | 4 °C | 1.3 mm | 44 % | 11 km/h |
| 01:00 | light rain | 4 °C | 1.8 mm | 49 % | 12 km/h |
| 02:00 | rain | 4 °C | 2.5 mm | 54 % | 18 km/h |
| 03:00 | heavy drizzle | 4 °C | 1.0 mm | 59 % | 22 km/h |
| 04:00 | light rain | 5 °C | 1.9 mm | 65 % | 22 km/h |
| 05:00 | light rain | 5 °C | 1.8 mm | 72 % | 27 km/h |
| 06:00 | rain | 5 °C | 2.8 mm | 80 % | 24 km/h |
| 07:00 | drizzle | 5 °C | 0.6 mm | 86 % | 19 km/h |
| 08:00 | drizzle | 6 °C | 0.7 mm | 89 % | 14 km/h |
| 09:00 | light drizzle | 6 °C | 0.2 mm | 90 % | 8 km/h |
| 10:00 |  fog | 8 °C | 0.0 mm | 90 % | 13 km/h |
| 11:00 | light drizzle | 11 °C | 0.1 mm | 90 % | 17 km/h |
| 12:00 | light drizzle | 13 °C | 0.3 mm | 88 % | 27 km/h |
| 13:00 | drizzle | 13 °C | 0.5 mm | 86 % | 29 km/h |
Location of Zwalm
Zwalm lies at 42 m, 22 m above the average of the 55 places we cover in the province of East Flanders (20 m). That makes it the 9th highest of the 55. The main town, Ghent, lies 19 km to the north. The nearest places we cover are Zottegem (6 km to the east), Gavere (6 km to the north-west), Horebeke (7 km to the south-west) and Oosterzele (7 km to the north-east). With about 8,148 inhabitants according to GeoNames, Zwalm is the 45th largest of the 52 places we cover in the province of East Flanders. Of the places of interest on this site, the nearest are Atomium (sight, 43 km to the east) and Sonian Forest (natural site, 49 km to the east).
Today is close to the November normal (10.2 °C).
Climate of Zwalm: 1991–2020 normals
In Zwalm, July is typically the warmest month (up to 23.1 °C on average), while January is the coldest at 1.8 °C. August sees the most rain, with around 87 mm.
By season (average highs, 1991–2020 normals): winter 6.9 °C and 212 mm of rain, spring 14.7 °C and 164 mm, summer 22.3 °C and 232 mm, autumn 14.9 °C and 201 mm. The wettest season is summer (29 % of the annual total), the driest spring (20 %).
| Max T (°C) | Min T (°C) | Rainfall (mm) | Rainy days | |
|---|---|---|---|---|
| January | 6.5 | 1.8 | 72 | 13 |
| February | 7.5 | 1.8 | 59 | 12 |
| March | 11.0 | 3.7 | 55 | 12 |
| April | 14.8 | 6.0 | 49 | 12 |
| May | 18.2 | 9.4 | 60 | 12 |
| June | 21.0 | 12.4 | 68 | 12 |
| July | 23.1 | 14.5 | 77 | 13 |
| August | 22.8 | 14.3 | 87 | 12 |
| September | 19.5 | 11.6 | 64 | 11 |
| October | 15.0 | 8.6 | 67 | 12 |
| November | 10.2 | 5.0 | 70 | 13 |
| December | 6.8 | 2.4 | 81 | 13 |
Compared with Ghent, the main town 19 km to the north, highs in the warmest month are 0.3 °C higher here, and the year brings 22 mm more precipitation. In no month does the average low fall below 0 °C; in 3 months the average high exceeds 20 °C (June, July and August).
Nearby places with normals of their own (from another station or reanalysis grid cell) compare as follows: Zottegem (6 km to the east): equally warm summers and 12 mm wetter a year; Horebeke (7 km to the south-west): summers 0.3 °C cooler and 3 mm wetter a year; Brakel (10 km to the south): summers 0.2 °C warmer and 14 mm wetter a year. Among the 55 places we cover in the province of East Flanders whose normals come from the ERA5 reanalysis, Zwalm ranks 28th for summer warmth and 29th for annual precipitation. The warmest summers are in Ninove and the coolest in Sint-Laureins; the wettest year is in Ninove and the driest in Maldegem, Eeklo and Sint-Laureins.
What is the warmest month in Zwalm?
The warmest month in Zwalm is typically July, averaging 23.1 °C (1991–2020 normal). The coldest is January, at 1.8 °C.
How many rainy days does Zwalm get per year?
Zwalm sees about 147 rainy days a year, adding up to roughly 808 mm of rainfall (1991–2020 normals).
How big is the gap between summer and winter in Zwalm?
Between July and January, the temperature gap in Zwalm runs to about 21.3 °C, based on the 1991–2020 normals.