General Weather Evolution for the Next 6 Days
Europe: Analysis & Forecast maps (6 days)
Update 16-9-25 at 12 AM – Evolution of the Weather Pattern
Atmospheric evolution
The westerly oceanic flow currently sweeping across our regions will gradually be influenced by the stabilising effect of a high-pressure system (1022–1024 hPa), extending from the maritime zones west of Portugal to southern Germany as of Wednesday.
From Thursday onwards, one of the cores of this anticyclone (1025–1028 hPa) will settle over the north-eastern Balkans and Romania. This will establish a more continental southerly airflow over the Benelux, bringing increasingly mild, at times even warm, conditions towards the end of the week and into the weekend.
Meanwhile, a depression (deepening from 1012 to 1002 hPa) will develop on Saturday from the Bay of Biscay towards the British Isles. It will drive an active and stormy cold front across the Channel, Normandy and Brittany, before gradually sliding eastward through the weekend.
At the beginning of next week, as this low-pressure system moves across France and southern Germany, significantly cooler air will invade from the north, accompanied by widespread rainfall and associated disturbances.
Forecasts for the next 36 hours (chart)
(These forecasts are usually updated daily)
Update – 16 September 2025, 9am
(Multimodel BMCB: ICOND2 · AROME-HD · ALADIN)
🌧 Rainfall (next 36h)
- North of the Scheldt: 1–7 L/m²
- Between Scheldt and Sambre–Meuse: 0.5–5 L/m²
- South of Sambre–Meuse: 0–4 L/m²
🗓️ Today
🔹 Morning
Sunny at the coast before clouds build up (30–60 % cumulus). Elsewhere, variable skies (40–80 %) with a few isolated showers, mainly in Hainaut and Walloon Brabant. South of the Sambre–Meuse axis, skies remain mostly overcast (70–100 %) with local showers on the Liège highlands.
🌬 Southwest to west winds, gusts 45–65 km/h, up to 75 km/h on the coast.
🔹 Afternoon
Changeable weather. Broad sunny spells in Limburg, elsewhere mostly cloudy (70–100 %) with cumulus, altocumulus and cirrus. Showers across Walloon Brabant, Namur, Luxembourg and Liège.
🌬 Westerly winds, gusts 40–60 km/h.
🌡 Highs: around 18°C at the coast, 17–19°C inland, 14–16°C in the High Ardennes.
🔹 Evening
Sunny intervals over Flanders, Walloon Brabant and western Liège. Elsewhere, 70–100 % cloud cover with stratocumulus, altostratus and cirrostratus.
🌬 Southwest to west winds, 10–30 km/h, still 30–45 km/h at the coast.
🔹 Night
Clearer skies over Limburg, elsewhere 60–100 % cloud cover with increasing rain, especially in Flanders, Hainaut and both Brabants.
🌬 Southwest winds, 10–30 km/h.
🌡 Lows: about 13°C on the coast, 11–13°C inland, 8–12°C south of Sambre–Meuse, locally 6–8°C in Ardennes valleys.
🗓️ Tomorrow
🔹 Morning
Clearing in Hainaut and Namur, elsewhere 90–100 % stratocumulus/altostratus with rain, especially in Flanders and Liège.
🌬 South to southwest winds, 20–40 km/h.
🔹 Afternoon
Sunny intervals in southern Hainaut, Namur and Luxembourg province. Elsewhere mostly cloudy (90–100 %) with rain across Flanders, Walloon Brabant and Liège.
🌬 Southwest winds, 25–45 km/h.
🌡 Highs: around 19°C on the coast, 18–21°C inland, 14–17°C in the High Ardennes.
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Forecast for the coming days
Multimodel BMCB ( OPERATIONAL + ENSEMBLES ICON-GFS-ECMWF-AIFS-GCGFS )
Forecast of the range of temperatures, precipitations + general type of weather in Belgium
(These forecasts are generally updated every 2-4 days)
Update – 15 September 2025, 3pm
Weather evolution (Multimodel BMCB – ICON · AIFS · ECMWF)
🔹 Thursday 18 September
Very mild (19–25°C), with clouds gradually giving way to brighter spells. Still breezy, with westerly to south-westerly winds reaching 40–60 km/h.
🔹 Friday 19 September
A true summer’s day: sunny, dry and hot, highs of 23–29°C.
🔹 Saturday 20 September
Still very hot and sunny (23–29°C). By afternoon, the west will see heavy showers or thunderstorms, spreading countrywide overnight. Gusts of 45–65 km/h possible in storms.
🔹 Sunday 21 September
Back to seasonal values (14–20°C) with rain at times, locally heavy, especially across central and eastern areas.
🔹 Monday 22 September
Cooler and windy (12–18°C) with a strong north-easterly (45–65 km/h) and locally heavy rain in the east. Some brighter intervals may appear in the west.
Outlook (ensemble + AIFS) : From 23 September, a cool and unsettled spell with highs around 12–19°C, alternating between rain and drier periods.
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METEOCONSULT
BENELUX:
Update 12-9-25
Weather outlook:
🔹 Period: 26 September – 5 October
The high-pressure system may weaken, giving way to a barometric trough with unsettled pressure patterns. This scenario favours a more unstable atmosphere, with showers or occasional thunderstorms developing, particularly inland.
🔹 Week of 6 – 12 October
Unsettled conditions are expected to continue, with frequent showers or rainy spells. Temperatures should remain close to seasonal averages.
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Update 25-8-25
Weather Outlook for 3 months
- September: marked variability at the start of the meteorological autumn
Temperature (anomaly): slightly above average (≈ +0.5 to +1.0 °C), consistent with the European seasonal model trend (ECMWF/C3S).
Precipitation (anomaly): rather dry. September is likely to be very contrasting, with a disturbed start followed by a more anticyclonic regime. - October: near-average temperatures and little rainfall
Temperature (anomaly): close to seasonal norms, under more frequent anticyclonic influence. This could see the first autumn frosts appearing.
Precipitation (anomaly): trend close to normal. - November: a very mild month
Temperature (anomaly): above seasonal averages (+0.5 to +1 °C on average).
Precipitation (anomaly): uncertainty remains over the possible return of a more disturbed oceanic flow, which would bring beneficial rainfall.
Update to BMCB Multimodel – since 1 September 2025
from ICON (replace location left above )
from ECMWF (replace location left above)