Forecasts for the next 36 hours
(chart)
(These forecasts are usually updated daily)
Weather Update – 20 December 2025 | 8 a.m.
Sources: BMCB Multimodel (ICOND2 – AROME HD – ALADIN)
🌧️ Expected rainfall (next 36 hours)
- Between the Scheldt and the Sambre–Meuse: 0–3.5 L/m²
- South of the Sambre–Meuse: 0.5–3 L/m²
🌥️ Today: a mix of cloud, rain and occasional brighter spells
Morning
Sunny intervals will mainly occur around Antwerp and in East Flanders. Elsewhere, skies remain largely overcast, with patchy rain, especially over the southern parts of Namur and Luxembourg provinces.
Wind: variable to east–southeast, gusts 5–25 km/h.
Afternoon
Cloud will dominate most regions, with conditions turning increasingly wet west of the Meuse.
Wind: east to southeast, gusts 15–30 km/h.
Maximum temperatures: around 7°C along the coast, 7–9°C inland, and 7–8°C in the High Ardennes.
Evening
Local fog patches may form in the eastern parts of the country. Light rain will linger over Antwerp and the Flemish regions, while clearer spells develop across northern Namur, western Liège, and eastern Limburg.
Wind: southeast, gusts 10–30 km/h.
Night
Fog may develop locally south of the Sambre–Meuse corridor, especially across the Campine. Fresh light rain is possible in the south of Luxembourg province, while widespread clear spells are expected north of the Sambre–Meuse.
Minimum temperatures: around 7°C at the coast, 8°C inland, and generally 5–10°C south of the Sambre–Meuse.
🌦️ Tomorrow: brighter conditions in the east
Morning
Conditions will turn fairly sunny east of the Meuse, across the Hesbaye and Limburg. Elsewhere, skies remain mostly cloudy, with a risk of light rain over southern Hainaut.
Wind: east to southeast, gusts 15–30 km/h.
Afternoon
A brighter spell is expected across much of the country. However, the Flemish regions and western Hainaut will stay cloudy, with occasional light rain, particularly in West Flanders.
Wind: easterly, gusts 15–30 km/h.
Maximum temperatures: close to 10°C along the coast, 11–13°C inland, and 10–11°C in the High Ardennes.
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National Thermal Indicator
(Chart)
MULTIMODEL BMCB
(These forecasts are generally updated daily)
Weather Update – 20 December 2025 | 10 AM
As the winter solstice approaches, the atmosphere is beginning a more decisive shift toward colder conditions. On 21 December, the national thermal index will still fluctuate between +2 and +5, reflecting relative mildness for the season, with maximum temperatures ranging from 10 to 13°C, depending on the region.
From 22 December onward, however, the thermal signal will change markedly. The national index will move into negative territory, generally fluctuating between –2 and –3. This shift will result in a clear drop in daytime temperatures: –1 to +5°C on the least cold days, and –4 to +2°C during the coldest spells.
In this context, night-time and early-morning frosts will become widespread across the country. Minimum temperatures will fall between +2 and –4°C during the mildest nights, and may reach 0 to –6°C, or even lower in the valleys south of the Sambre–Meuse line, during clear and light-wind nights. A decidedly wintery atmosphere will gradually take hold across our regions.
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General Weather Evolution for the Next Days
Europe: Analysis & Forecast maps (6=>? days)
Weather Update – 20 December 2025 | 11 AM
The atmospheric pattern is undergoing a clear shift.
With the establishment of a strong anticyclone reaching 1028–1029 hPa over Scandinavia, the very mild south-easterly to easterly flow that has shaped recent conditions will gradually veer toward the east and northeast, while at the same time strengthening.
This circulation will increasingly draw in colder continental air, gradually introducing a more distinctly wintry feel. Around 24 December, the flow may become temporarily slightly disturbed, as weak weather systems move through the colder air mass.
As Christmas approaches and into the weekend, the anticyclone is expected to intensify further, reaching 1041–1044 hPa while slowly shifting westward over southern Norway. This evolution will firmly lock in the pattern, maintaining cold, stable continental air over our regions and establishing a persistent winter-like atmosphere.
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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)
Weather Update – 20 December 2025 | 1 pm
Overview of the expected weather evolution – BMCB Multimodel (ICON, AIFS, ECMWF)
The latest guidance confirms the gradual establishment of winter conditions, characterised by low temperatures, frequent frost, and a continental airflow, particularly noticeable along the coast.
Monday 22 December
A seasonal day with largely dry and fairly sunny weather. Cloud cover will be more extensive across the Campine region and the south of Luxembourg Province.
Minima: –2 to +4°C | Maxima: 3 to 9°C
Tuesday 23 December
Colder conditions set in. The sky will remain mostly heavily clouded, with only occasional local breaks. An east to north-easterly wind will strengthen, with gusts reaching 40–50 km/h along the coast.
Minima: –3 to +3°C | Maxima: 1 to 7°C
Wednesday 24 December – Christmas Eve
A distinctly wintery atmosphere develops. Sunshine will dominate in the west, while elsewhere skies turn variable to overcast. Light snowfall is possible over the higher ground of Liège Province. Overnight, a few snow flurries may occur locally south of the Sambre–Meuse axis and across Hainaut.
The east to north-easterly wind will be brisk, with gusts of 45–65 km/h, locally up to 75 km/h along the coast.
Minima: –4 to +2°C | Maxima: –1 to +5°C
Thursday 25 December – Christmas Day
A cold Christmas Day, with mostly overcast skies. Some brighter intervals remain possible, especially across Flanders. During the following night, there is a slight risk of snow in the southern Ardennes.
Minima: –6 to 0°C | Maxima: –4 to +2°C
Friday 26 December
Dry and chilly weather, with a mix of sunny spells and cloud. Overnight, clear spells will widen from the north-east, allowing for a marked drop in temperatures.
Minima: –6 to 0°C | Maxima: –4 to +2°C
Likely trend towards the end of the year
The period looks set to remain predominantly cold, with regular frost and a firmly wintry backdrop.
- 27–29 December: generally dry, persistently cold, frequent night frosts.
- 30 December to 2 January: light precipitation, at times as snow over the High Ardennes, or sleet/wet snow in low-lying areas.
- 3 January: continued cool conditions, with occasional light precipitation.
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Forecast anomalies at 500 hPa
(mid-troposphere = 5,000–6,000 m altitude)
( charts )
Weather Update – 20 December 2025 | 7 AM
As the year draws to a close, a notable shift in atmospheric circulation is expected across the North Atlantic. During the final days of December and the opening days of January, the anticyclonic zone is forecast to centre south-west of Iceland, causing the dominant airflow to turn northerly. This configuration could temporarily open the door to advections of polar air, at times unstable or disturbed, with potential impacts on our regions.
In a subsequent phase, during the second and partly the third week of January, signals point toward a renewed expansion of high-pressure systems toward Scandinavia and Russia. At the same time, depression activity would become focused along a broad southern corridor, stretching from the Azores and Portugal to Ukraine, via the Alps and the northern Balkans. From this zone, disturbed air may at times push northwards toward our areas, while a cold continental flow continues to dominate at lower levels.
By late January, conditions are likely to be characterised by persistent high pressure over northern Europe, alongside continued low-pressure activity over the near Atlantic and the Bay of Biscay. This setup would foster the development of air-mass conflict zones, where milder oceanic air advancing into France meets colder continental air still circulating over the British Isles, the North Sea and Germany.
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METEOCONSULT
BENELUX:
Weather Outlook for 3-4 weeks
Update: 18 December 2025 – 7 p.m.
Weather trend – from 3 to 11 January 2026
The large anticyclone anchored over northern Europe is showing signs of weakening and is expected to gradually give way to a more unsettled, low-pressure-driven pattern. This transition would mark a significant change in weather conditions.
Initially, as milder and more humid air attempts to override still cold low-level air masses, one or two snowfall events at low elevations cannot be ruled out.
At this range, any detailed forecast remains uncertain: the exact nature of the precipitation will depend on subtle thermal balances, where differences of just a few tenths of a degree could determine whether precipitation falls as rain or snow.
Gradually, milder Atlantic air is likely to gain the upper hand, bringing temperatures back towards values closer to the seasonal average.
Week of 12 to 18 January 2026
The scenarios currently favoured point towards milder and wetter conditions. Successive weather fronts would affect large parts of the country.
In this context, temperatures would rise well above seasonal norms, creating a more autumnal than truly wintry atmosphere for mid-January.
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Weather Outlook for 3 months
Update 13-12-25 – 3:00 PM
Late winter outlook 2026
January 2026: unsettled and generally mild
Temperatures
A nationwide temperature anomaly close to +1.0°C is expected. Disturbed oceanic flows will frequently bring mild conditions, punctuated by brief cold-air incursions.
The probability of temperatures near or above average is around 80%.
Precipitation
A slight rainfall surplus (+10%) is likely due to frequent Atlantic disturbances within a prevailing west to south-westerly flow.
January could therefore become the wettest month of the 2025–2026 winter.
Overall pattern
A dynamic Atlantic circulation would favour a steady succession of Atlantic weather systems.
February 2026: slightly drier, still mild
Temperatures
A temperature surplus of around +1.0°C is expected to persist. Southerly to south-easterly flows may dominate between Atlantic lows and more anticyclonic conditions over central Europe.
Overall mild conditions, with occasional colder continental spells.
Precipitation
A slight precipitation deficit (-10%) is expected as weather systems become less active under the influence of continental high pressure.
Overall pattern
An alternation between anticyclonic phases and weak disturbances arriving from the west or south.
Short cold and dry periods may occur in between.
March 2026: finally a seasonally normal month?
Temperatures
Values close to seasonal averages, alternating between colder spells and milder, more unstable periods.
Precipitation
Rainfall amounts generally close to climatological normals.
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Update to BMCB Multimodel – since 1 October 2025
from ICON (replace location left above )
from ECMWF (replace location left above)