Forecasts for the next 36 hours (chart)
(These forecasts are usually updated daily)
Update 12-12-25 – 9am
Multi-model BMCB: ICOND2 – AROMEHD – ALADIN
Precipitation (next 36 hours)
• North of the Scheldt: 0 L/m²
• Between Scheldt and Sambre–Meuse: 0–0.5 L/m²
• South of Sambre–Meuse: 0–0.5 L/m²
Today
Morning
• Locally persistent fog in the Ardennes.
• Some sunny intervals over the province of Liège.
• Elsewhere: 90–100% stratus–stratocumulus–cirrus.
• Wind: S, gusts 15–35 km/h.
Afternoon
• Brighter spells in West Flanders; isolated breaks elsewhere.
• Still mostly cloudy (80–100%).
• Wind: S, 15–35 km/h.
• Max temperatures: 13°C coast, 9–11°C inland, 7–8°C High Ardennes.
Evening
• Widespread fog south of the Sambre–Meuse axis.
• Elsewhere a few clear spells, cloud cover 20–90%.
• Wind: southerly or variable, 5–25 km/h.
Tonight
• Extensive fog, especially south of Sambre–Meuse.
• Elsewhere overcast (100%) with some drizzle, mainly in central Belgium.
• Possible clearer intervals in north-east Liège.
• Wind: variable, 0–15 km/h.
• Min temperatures: 9°C coast, 6–9°C inland, 4–8°C south of Sambre–Meuse.
Tomorrow
Morning
• Local, persistent fog in the centre and south-east.
• Broad sunny spells in both Flanders.
• Elsewhere 100% stratus-stratocumulus-altostratus-cirrus with risk of local drizzle.
• Wind: variable, 0–15 km/h.
Afternoon
• Fog locally persistent centre and south-east.
• Sunny weather in Flanders, western Hainaut, Antwerp and the western Brabants.
• Elsewhere dense cloud cover (100%).
• Wind: variable or SW, 5–15 km/h.
• Max temperatures: 11°C coast, 8–10°C inland, 6–7°C High Ardennes.
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National Thermal Indicator (Chart)
MULTIMODEL BMCB
(These forecasts are generally updated daily)
Update – 12 December 2025, 10 AM
Over the next few days, the national temperature index is expected to fluctuate between +6 and +2, a trend likely to hold through 20 December.
In practical terms, this will translate into daytime highs generally ranging from 6 to 13°C during the milder periods, while slightly cooler phases will deliver maximum temperatures between 4 and 10°C.
Between 20 and 27 December, a gradual decline in the index is anticipated, from +2 down to around -3.
This evolution would correspond to a marked cooling, with daytime highs slipping from 3–9°C to values between -3 and +4°C depending on the region in Belgium, along with widespread night-time frost.
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General Weather Evolution for the Next Days
Europe: Analysis & Forecast maps (6=>? days)
Update – 12 December 2025 – 11 am
Over the next 24 hours, a large 1030 hPa high-pressure system will extend from the Bay of Biscay to Romania and Ukraine.
This setup will bring mild, calm, and often misty conditions across our regions.
In the following days, the main center of this high-pressure system will establish itself over the northern and eastern Balkans, maintaining a stable and still notably mild southerly flow from France toward our area.
From mid to late next week, new rainy and windy disturbances are expected to arrive: first over the British Isles, then over western France, and eventually over our regions.
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Forecast for the coming days (Chart)
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 usually updated daily)
Update 12 December 2025 – 2 PM
Weather Overview – BMCB Multimodel
(Operational Models + ICON, AIFS, ECMWF)
Sunday, 14 December
Precipitation: 0 L/m²
Min./Max.: 1–7° / 5–11°
Relatively mild conditions. Morning fog, especially in Gaume, followed by mostly cloudy skies with some brighter intervals.
Monday, 15 December
Precipitation: 0 L/m²
Min./Max.: 1–7° / 6–12°
Very mild. Becoming mostly sunny, though stubborn cloud cover may persist over the southern High Ardennes. Moderate winds with gusts of 35–55 km/h.
Tuesday, 16 December
Precipitation: 0–4 L/m²
Min./Max.: 3–9° / 7–13°
Very mild. Alternating sunny spells and cloudier periods; some rain in western Belgium.
Wednesday, 17 December
Precipitation: 0–4 L/m²
Min./Max.: 2–8° / 6–12°
Still very mild. Mostly cloudy with brief clear intervals. Widespread rain arriving overnight from the west.
Thursday, 18 December
Precipitation: 0–20 L/m²
Min./Max.: 5–11° / 7–13°
Persistently very mild. Further rain mainly in the east; more sunshine in the west.
Likely Trend
Friday, 19 December
Precipitation: 4–13 L/m²
Min./Max.: 4–10° / 7–13°
New rain systems moving in from the west. Very mild.
Saturday, 20 December
Precipitation: 0–1 L/m²
Min./Max.: 1–7° / 5–11°
Fairly mild and mostly dry.
Sunday, 21 December
Precipitation: 0–3 L/m²
Min./Max.: 0–6° / 4–10°
Fairly mild with little or no precipitation.
Monday, 22 December
Precipitation: 1–5 L/m²
Min./Max.: 0–6° / 3–9°
Still relatively mild. Occasional very light precipitation.
Tuesday, 23 December
Precipitation: 2–3 L/m²
Min./Max.: –1–5° / 1–7°
Temperatures returning to seasonal levels. Light precipitation, sometimes falling as snow or sleet in the High Ardennes.
Wednesday, 24 December
Precipitation: 2–3 L/m²
Min./Max.: 0–6° / 1–7°
Seasonal conditions. Occasional light precipitation, locally snow or wet snow over higher terrain.
Thursday, 25 December
Precipitation: 1–2 L/m²
Min./Max.: –2–4° / 0–6°
Cool weather. Occasional very light precipitation, possibly snow in the High Ardennes.
Friday, 26 December
Precipitation: ±1 L/m²
Min./Max.: –3–3° / –2–4°
Cold and generally dry.
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METEOCONSULT
BENELUX:
Weather Outlook for 3-4 weeks
Update – 5 December 2025
🗓 Period from 19 to 28 December — Christmas Week
Recent atmospheric modelling points to a calmer, high-pressure-dominated pattern during Christmas week. Under winter anticyclones, fog and low clouds are likely to be widespread, occasionally limiting sunshine. Temperatures would gradually decrease but remain slightly above seasonal norms.
🗓 Week from 29 December to 4 January — New Year Week
The high-pressure system may shift northward, introducing a more continental and progressively colder airflow. The weather would stay calm and dry, with frequent morning fog and low clouds, but with more afternoon bright spells. Temperatures would return to near-seasonal values, especially south of the Sambre–Meuse line.
Forecast anomalies over 1 month
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Weather Outlook for 3 months
Update 26-11-25
December 2025: a rather mild start to winter, no clear precipitation signal
Temperatures: positive anomaly of +0.5°C to +1.0°C. Few lasting cold spells; alternating polar incursions and milder phases, similar to November. High confidence in above-average temperatures.
Precipitation: near normal, locally slightly below average in the north and east. Low confidence.
General pattern: prevailing west–southwest flow, alternating unsettled periods and calmer phases. Limited lowland snow, but regular snowfall at higher elevations.
January 2026: more contrast, unsettled and generally mild
Temperatures: continued thermal surplus (+0.5°C to +1.0°C). Some short-lived wintry episodes possible due to continental cooling. Probability of mild conditions dominating: > 60%.
Precipitation: slight excess (+5% to +20%) in western, southern and upland areas; elsewhere near normal. Medium confidence.
General pattern: renewed active Atlantic flow with successive disturbances, risk of windstorms and notable snowfall in mid-mountains. In lowlands, snow remains scarce and brief.
February 2026: more variable, closer to seasonal norms
Temperatures: near normal to slightly above (0 to +0.5°C), with large scenario spread and potential for brief cold spells. Low confidence.
Precipitation: around normal, possibly slightly wetter in the east and uplands. Low confidence.
General pattern: alternating high-pressure phases and unsettled returns. Colder outbreaks linked to a weakened polar vortex remain possible, particularly late in the month.
Winter 2025–2026: summary
A slightly milder-than-average winter with a mean anomaly of +0.5°C to +1.0°C. Precipitation near seasonal norms overall — drier in December, wetter in January.
Dominant scenario: frequent Atlantic influence, regular disturbances, cold spells generally short-lived. La Niña and a potentially weakened polar vortex may still promote sharper wintry episodes, especially in January, without altering the overall mild signal.
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Update to BMCB Multimodel – since 1 October 2025
from ICON (replace location left above )
from ECMWF (replace location left above)