Home › Walloon Brabant › Lasne
Weather in Lasne
Walloon Brabant, 78 m · continuously updated
Uccle (15 km) · 9 °C · KMI/IRM 14:00
- Wind
- –
- Humidity
- –
- Rain ahead
- –
- Sunset
- –
Temperature · last 4 and next 28 hours
Lasne weather: the next 24 hours
Updated hourly.
Lasne 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 Lasne
Neighbouring towns, as the crow flies.
Official weather warnings
No active warning for Walloon Brabant.
Updated 15 Nov 13:48.
Is there an active weather warning for Lasne?
No active warning for Walloon Brabant.
Latest RMI observation near Lasne
Measured at Uccle, 15 km from Lasne: situation as of 15 November 2026, 14:00. Uccle 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 | 9.3 °C |
| Wind | 18 km/h S |
| Gusts | 36 km/h |
| Rain, last hour | 0.0 mm |
| Humidity | 86 % |
| 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 Lasne
The weather station nearest to Lasne, Uccle located 104 m above sea level, is 16 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 Lasne
- 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 (2.6 mm, up to 92 % 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 3.6 °C; once warmed to 20 °C, that air holds only 34 % humidity, against 50 % in a typical home: opening the windows dries the house. How it is calculated
- Garden: 26.9 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 Lasne
Today (Sunday 15 Nov) in Lasne: heavy drizzle, 0 to 10 °C, precipitation 4.2 mm (92 %), wind up to 24 km/h. Tomorrow: light rain, 3 to 10 °C.
| Day | Weather | Min | Max | Precip. | Wind |
|---|---|---|---|---|---|
| Today | heavy drizzle | 0 °C | 10 °C | 4.2 mm | 24 km/h |
| Tomorrow | light rain | 3 °C | 10 °C | 3.9 mm | 32 km/h |
| Tue 17 Nov | rain | 4 °C | 14 °C | 24.1 mm | 31 km/h |
| Wed 18 Nov | drizzle | 8 °C | 11 °C | 2.4 mm | 26 km/h |
| Thu 19 Nov | showers | 8 °C | 10 °C | 13.3 mm | 23 km/h |
| Fri 20 Nov | heavy drizzle | 2 °C | 9 °C | 13.6 mm | 19 km/h |
| Sat 21 Nov | overcast | 1 °C | 9 °C | 0.0 mm | 12 km/h |
Tomorrow's weather in Lasne
Tomorrow, Monday 16 Nov, in Lasne: light rain, from 3 to 10 °C, 3.9 mm of precipitation (probability 63 %), wind up to 32 km/h.
| Hour | Weather | Temp. | Precip. | Chance | Wind |
|---|---|---|---|---|---|
| 00:00 |  overcast | 9 °C | 0.0 mm | 63 % | 15 km/h |
| 03:00 |  light drizzle | 9 °C | 0.1 mm | 51 % | 21 km/h |
| 06:00 | drizzle | 8 °C | 0.5 mm | 48 % | 26 km/h |
| 09:00 | overcast | 7 °C | 0.0 mm | 36 % | 23 km/h |
| 12:00 | overcast | 7 °C | 0.0 mm | 26 % | 25 km/h |
| 15:00 | overcast | 7 °C | 0.0 mm | 18 % | 19 km/h |
| 18:00 | overcast | 3 °C | 0.0 mm | 15 % | 11 km/h |
| 21:00 | overcast | 3 °C | 0.0 mm | 25 % | 8 km/h |
Frequently asked questions
Will it rain tomorrow in Lasne?
Yes: 3.9 mm expected, probability 63 %.
How warm will it be tomorrow in Lasne?
Between 3 and 10 °C.
The weekend
Today, Sunday, in Lasne: heavy drizzle, 0 to 10 °C. Next weekend: Saturday overcast, 1 to 9 °C, Sunday drizzle, 4 to 9 °C.
| Day | Weather | Min | Max | Precip. | Wind |
|---|---|---|---|---|---|
| Today | heavy drizzle | 0 °C | 10 °C | 4.2 mm | 24 km/h |
| Sat 21 Nov | overcast | 1 °C | 9 °C | 0.0 mm | 12 km/h |
| Sun 22 Nov | drizzle | 4 °C | 9 °C | 8.4 mm | 24 km/h |
Hour by hour
The next 48 hours in Lasne, hour by hour: temperature from 3 to 14 °C, 26.9 mm of rain expected.
| Hour | Weather | Temp. | Precip. | Chance | Wind |
|---|---|---|---|---|---|
| 14:00 | overcast | 8 °C | 0.0 mm | 16 % | 23 km/h |
| 15:00 | overcast | 9 °C | 0.0 mm | 30 % | 23 km/h |
| 16:00 | light drizzle | 9 °C | 0.4 mm | 45 % | 21 km/h |
| 17:00 | heavy drizzle | 10 °C | 1.1 mm | 62 % | 19 km/h |
| 18:00 | heavy drizzle | 10 °C | 1.0 mm | 81 % | 24 km/h |
| 19:00 | drizzle | 10 °C | 0.9 mm | 92 % | 21 km/h |
| 20:00 | drizzle | 10 °C | 0.7 mm | 91 % | 20 km/h |
| 21:00 | overcast | 10 °C | 0.0 mm | 84 % | 18 km/h |
| 22:00 | overcast | 10 °C | 0.0 mm | 76 % | 17 km/h |
| 23:00 | overcast | 10 °C | 0.0 mm | 69 % | 17 km/h |
| 00:00 | overcast | 9 °C | 0.0 mm | 63 % | 15 km/h |
| 01:00 | overcast | 10 °C | 0.0 mm | 57 % | 18 km/h |
| 02:00 | light drizzle | 9 °C | 0.2 mm | 53 % | 19 km/h |
| 03:00 | light drizzle | 9 °C | 0.1 mm | 51 % | 21 km/h |
| 04:00 |  light rain | 9 °C | 1.7 mm | 49 % | 32 km/h |
| 05:00 | light drizzle | 9 °C | 0.3 mm | 48 % | 31 km/h |
| 06:00 | drizzle | 8 °C | 0.5 mm | 48 % | 26 km/h |
| 07:00 | light drizzle | 8 °C | 0.3 mm | 47 % | 23 km/h |
| 08:00 | light drizzle | 8 °C | 0.1 mm | 42 % | 28 km/h |
| 09:00 | overcast | 7 °C | 0.0 mm | 36 % | 23 km/h |
| 10:00 | overcast | 7 °C | 0.0 mm | 31 % | 20 km/h |
| 11:00 | overcast | 7 °C | 0.0 mm | 28 % | 19 km/h |
| 12:00 | overcast | 7 °C | 0.0 mm | 26 % | 25 km/h |
| 13:00 |  mostly sunny | 7 °C | 0.0 mm | 24 % | 23 km/h |
| 14:00 |  partly cloudy | 7 °C | 0.0 mm | 21 % | 22 km/h |
| 15:00 | overcast | 7 °C | 0.0 mm | 18 % | 19 km/h |
| 16:00 | partly cloudy | 6 °C | 0.0 mm | 16 % | 17 km/h |
| 17:00 | overcast | 5 °C | 0.0 mm | 15 % | 14 km/h |
| 18:00 | overcast | 3 °C | 0.0 mm | 15 % | 11 km/h |
| 19:00 | overcast | 3 °C | 0.0 mm | 16 % | 9 km/h |
| 20:00 | overcast | 3 °C | 0.0 mm | 20 % | 8 km/h |
| 21:00 | overcast | 3 °C | 0.0 mm | 25 % | 8 km/h |
| 22:00 | overcast | 3 °C | 0.0 mm | 31 % | 6 km/h |
| 23:00 | drizzle | 4 °C | 0.7 mm | 37 % | 8 km/h |
| 00:00 | heavy drizzle | 4 °C | 1.0 mm | 43 % | 7 km/h |
| 01:00 | light rain | 4 °C | 1.9 mm | 49 % | 9 km/h |
| 02:00 | rain | 5 °C | 3.2 mm | 53 % | 14 km/h |
| 03:00 | heavy drizzle | 5 °C | 1.0 mm | 57 % | 17 km/h |
| 04:00 | light drizzle | 5 °C | 0.2 mm | 61 % | 18 km/h |
| 05:00 | drizzle | 5 °C | 0.5 mm | 66 % | 18 km/h |
| 06:00 | light rain | 5 °C | 1.9 mm | 72 % | 15 km/h |
| 07:00 | light rain | 6 °C | 1.7 mm | 78 % | 11 km/h |
| 08:00 | rain | 6 °C | 3.6 mm | 84 % | 8 km/h |
| 09:00 | heavy drizzle | 6 °C | 1.2 mm | 89 % | 2 km/h |
| 10:00 | light drizzle | 12 °C | 0.2 mm | 92 % | 23 km/h |
| 11:00 | light rain | 13 °C | 1.8 mm | 92 % | 19 km/h |
| 12:00 | light drizzle | 14 °C | 0.3 mm | 90 % | 27 km/h |
| 13:00 | light drizzle | 13 °C | 0.4 mm | 88 % | 28 km/h |
Location of Lasne
Lasne lies at 78 m, 16 m below the average of the 26 places we cover in the province of Walloon Brabant (94 m). That makes it the 8th lowest of the 26. The main town, Wavre, lies 9 km to the east. The nearest places we cover are Rixensart (5 km to the north-east), La Hulpe (5 km to the north), Ottignies-Louvain-la-Neuve (6 km to the east) and Hoeilaart (8 km to the north). With about 14,244 inhabitants according to GeoNames, Lasne is the 8th largest of the 26 places we cover in the province of Walloon Brabant. Of the places of interest on this site, the nearest are Waterloo, Lion’s Mound (sight, 7 km to the north-west) and Sonian Forest (natural site, 12 km to the north-west).
Today is close to the November normal (10.0 °C).
Climate of Lasne: 1991–2020 normals
In Lasne, July is typically the warmest month (up to 23.6 °C on average), while January is the coldest at 1.4 °C. August sees the most rain, with around 93 mm.
By season (average highs, 1991–2020 normals): winter 6.7 °C and 230 mm of rain, spring 15.1 °C and 170 mm, summer 22.8 °C and 248 mm, autumn 15.0 °C and 214 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 | 6.2 | 1.4 | 75 | 13 |
| February | 7.4 | 1.4 | 66 | 12 |
| March | 11.3 | 3.5 | 58 | 12 |
| April | 15.2 | 6.0 | 49 | 12 |
| May | 18.7 | 9.5 | 63 | 12 |
| June | 21.5 | 12.5 | 73 | 12 |
| July | 23.6 | 14.5 | 82 | 13 |
| August | 23.3 | 14.1 | 93 | 14 |
| September | 19.8 | 11.2 | 69 | 12 |
| October | 15.1 | 8.1 | 71 | 13 |
| November | 10.0 | 4.5 | 73 | 13 |
| December | 6.6 | 2.0 | 89 | 14 |
Its normals are almost identical to those of Wavre, the main town 9 km to the east. In no month does the average low fall below 0 °C; in 3 months the average high exceeds 20 °C (June, July and August).
The nearest neighbouring places, Ottignies-Louvain-la-Neuve, Hoeilaart and Braine-l'Alleud, have almost identical normals. Among the 26 places we cover in the province of Walloon Brabant whose normals come from the ERA5 reanalysis, Lasne ranks 9th for summer warmth and 16th for annual precipitation. The warmest summers are in Grez-Doiceau and the coolest in Ramillies; the wettest year is in Walhain and the driest in Rebecq.
What is the warmest month in Lasne?
The warmest month in Lasne is typically July, averaging 23.6 °C (1991–2020 normal). The coldest is January, at 1.4 °C.
How many rainy days does Lasne get per year?
Lasne sees about 153 rainy days a year, adding up to roughly 862 mm of rainfall (1991–2020 normals).
How big is the gap between summer and winter in Lasne?
Between July and January, the temperature gap in Lasne runs to about 22.2 °C, based on the 1991–2020 normals.