As part of a new meteorological simulation exercise conducted for the experimental aircraft Climate Impulse ( www.climateimpulse.org ), which will undertake a virtual circumnavigation of the globe during the second half of March over several days, our operational resources will once again be temporarily mobilized.
Consequently, the forecast publications issued on the groups, pages, and websites of the Belgian Meteo Club Belge will be somewhat reduced during this period.
Forecasts for the next 42 hours
(BMCB Multimodel: ICOND2 – AROME-HD – ALADIN)
(These forecasts are usually updated daily)
English
Weather Update – March 19, 2026
Precipitation (next 42 hours)
No significant precipitation is expected across the country.
A dry and stable air mass dominates, bringing largely sunny conditions with occasional high cloud cover.
This morning starts fairly sunny, with some high clouds over central and eastern areas. Easterly to northeasterly winds range from 15 to 35 km/h. During the afternoon, skies become sunnier. Highs reach around 14°C along the coast, 17–18°C inland, and 12–16°C in the Ardennes.
In the evening, high clouds return from the north.
Tonight remains partly veiled, clearing later. Lows drop to about 7°C at the coast, 2–7°C inland, and -1 to 5°C south of the Sambre–Meuse line.
Tomorrow begins partly cloudy, then turns mostly sunny. Highs around 11°C at the coast and 15–16°C inland. Clearing develops again in the evening.
****************
National Thermal Indicator
MULTIMODEL BMCB
(These forecasts are generally updated daily)
Update – 16 March 2026
Belgium’s national thermal indicator continues to rise and is expected to reach a peak between +4 and +5 on Tuesday 17 March.
Under these conditions, daytime temperatures will generally range between 9 and 17°C, confirming the establishment of a milder spell across the country.
For the remainder of the forecast period, the indicator is expected to gradually return to values between 0 and –2 from 21 March onward. Maximum temperatures would then range between 9 and 15°C on the mildest days, while cooler days would see values between 6 and 12°C.
In this thermal context, light night frosts may occur locally from 19 March, occasionally somewhat more pronounced in valley bottoms in the south-east of the country.
****************
General Weather Evolution for the Next Days over the Ocean and Europe
Europe: Analysis & Forecast maps
UPDATE – March 20, 2026
A ridge of high pressure, with values between 1022 and 1025 hPa, will extend this weekend from the Atlantic to Russia, via the British Isles and the North Sea.
Our regions will remain under the influence of a continental north-easterly flow, dry and still relatively mild for the season. Some cloud bands will nevertheless pass along its جنوبی flank.
On Monday, the flow will gradually shift to the north and northwest, before turning to the west and southwest on Tuesday as the high-pressure area drifts southward towards France and the western Mediterranean basin.
A marked change in weather is expected on Wednesday with the passage of a fairly active cold front moving across the Benelux from west to east during the day. It will be followed by an influx of significantly colder and unstable polar air, bringing frequent showers of rain, graupel, or locally sleet in lowland areas. Over the Ardennes, precipitation may fall as snow or sleet.
*****************
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 usually updated daily)
Weather Bulletin – Update of 20 March 2026
Summary of the meteorological evolution based on the BMCB multi-model
(Based on operational runs and ensembles ICON, AIFS, GFS and ECMWF)
Spring-like calm before a marked weather change midweek
A high-pressure ridge will persist throughout the weekend, extending from the Azores to Russia. Along its southern flank, dry and relatively mild continental air will be advected from the east to northeast.
After morning fog dissipates — particularly on Saturday across Limburg, Liège, Namur and locally Luxembourg — sunshine will quickly dominate. Some cloudiness will develop, more pronounced near the coast and later over the Ardennes and Gaume.
Temperatures will reach around 11°C over eastern high terrain and 15 to 16°C inland. Along the coast, values will remain limited to 8–9°C due to a moderate northerly to northeasterly wind (gusts 30–40 km/h).
Saturday night into Sunday will be mostly clear, though fog will redevelop, especially across central areas and valleys. Lows: 4–7°C at the coast, 0–4°C inland, with frost returning in Ardennes valleys (0 to -5°C).
On Sunday, morning grey conditions will clear slowly in the west, while elsewhere it will be mostly sunny with a few cumulus clouds. Highs: 11–13°C at the coast and in higher elevations, 15–16°C elsewhere.
Monday remains calm and dry with some high cloud.
On Tuesday, the high shifts towards France and the western Mediterranean. Winds turn southwesterly and strengthen (gusts 30–50 km/h). Milder air pushes temperatures up to around 18°C, especially in the Campine and central regions. However, a deterioration follows overnight with an active cold front bringing widespread rain.
Wednesday turns cooler and unsettled, with westerly winds (gusts 45–55 km/h), sunny spells and showers, some with small hail. Highs drop to 10–11°C inland and 6–7°C over higher ground. Showers intensify again overnight.
Thursday and Friday remain highly unstable with frequent showers of rain, graupel and even wet snow over the Ardennes. Temperatures range from 3 to 9°C with a strong northwesterly wind (gusts 45–65 km/h).
Outlook for next weekend: continued northerly flow with frequent showers. Daytime temperatures remain low, while nighttime minima range from 3 to 6°C in Flanders and -3 to 3°C inland, with a persistent risk of frost.
*************
Trend of 500 hPa anomalies (around 5500m) across Europe and the Atlantic Ocean
ALL Maps
Update – 14 March 2026
Trend for early April
Projections in the middle troposphere suggest the development of a broad high-pressure system extending from the nearby Atlantic towards the Norwegian Sea and Iceland. At the same time, a low-pressure belt could stretch from Morocco to the Black Sea.
Under these conditions, our regions would lie within a northerly to north-easterly airflow, bringing generally dry but rather cool air.
Trend for the week of 6–13 April
The high-pressure system is expected to persist, extending from Greenland towards northern Scandinavia. Meanwhile, low-pressure activity would tend to concentrate west of the Bay of Biscay and especially over the Middle East.
For our regions, this pattern could lead to a weak continental airflow or even a barometric slack situation, with relatively dry continental air and temperatures close to seasonal averages.
**************
SOURCE: METEOCONSULT
BENELUX:
Weather Outlook for 3-4 weeks
Update – 13 March 2026
Week of 30 March to 5 April: potential improvement but risk of spring frost
The most likely scenario suggests a return of high-pressure conditions at the beginning of April. This could bring calm and generally dry weather across the country in the run-up to the Easter weekend.
Such a pattern would probably lead to marked daily temperature contrasts: cool to cold mornings under clear skies followed by pleasant and distinctly spring-like afternoons.
However, the risk of late spring frost will need to be monitored closely, as it could locally prove damaging to vegetation that is already actively developing.
Week of 6 to 12 April: more unsettled weather before a possible rise in temperatures
During the following week, weather conditions may become more changeable again under the influence of a disturbed Atlantic flow.
Passing frontal systems would bring rainfall along with milder air masses. On a countrywide scale, temperatures could gradually move back above seasonal averages.
***************
Weather Outlook for 3 months
Update – 14 March 2026
Global context: La Niña weakening, possible shift toward El Niño
Ocean–atmosphere indicators across the tropical Pacific show that the La Niña episode is gradually weakening. Multi-model projections suggest a transition toward neutral conditions in the coming months, with increasing chances of an El Niño episode developing by summer.
Such a transition could eventually influence large-scale atmospheric circulation patterns and therefore affect temperature and precipitation regimes in several regions worldwide, including Europe.
April: a still variable start to spring
The westerly circulation is likely to remain fairly active across western Europe, leading to an alternation of disturbed spells and quieter periods under temporarily higher pressure.
Temperatures are expected to remain close to seasonal averages or slightly above, with an anomaly of about +0.5 to +1°C, which is relatively modest.
No dominant scenario currently emerges. In a marginal anticyclonic setting, the risk of late frost during clear nights remains possible.
Overall precipitation totals should remain near normal.
May: a more stable and rather mild pattern
Atlantic high-pressure systems may extend more frequently towards western Europe, favouring calmer and sunnier periods, occasionally interrupted by thunderstorms.
Temperatures would likely show a slight positive anomaly, around +0.5 to +1°C above normal, although this signal remains modest and indicates limited forecast confidence at this range.
Rainfall totals could become slightly below average.
June: a more summery, warm and thundery atmosphere
Early summer could be influenced by a recurring upper-level cold low over the Iberian Peninsula. This configuration would favour warm air advection towards our regions and frequent thunderstorm developments.
Although rainfall distribution would remain highly variable depending on storm activity, this setup could maintain a noticeable level of summer precipitation.
Temperatures are expected to be above normal, with a likely anomaly between +1 and +1.5°C.
Rainfall would largely depend on thunderstorms and may become locally above normal in the most affected areas.
**************
from ICON (replace location left above )
from ECMWF (replace location left above)