Belgium keeps yellow heat alert in place as temperatures reach 32C before midweek cooldown
Updated June 28, 2026, 12:00 UTC, Brussels: Belgium remains under an IRM heat warning from 00:00 on June 28 until 00:00 on July 1, with the national forecaster saying the current heatwave should ease by Wednesday as maximum temperatures fall below 25C in the centre of the country. The IRM forecast says Sunday remains the hottest point of the period, with highs of 24C at the coast, 30C in the centre and major cities, and up to 32C in Campine and Belgian Lorraine. The SPF Public Health says Belgium's heat and ozone plan is active to limit health impacts, especially for vulnerable people.
The warning affects daily life before the working week starts: commuters, outdoor workers, older people, children, chronically ill people and anyone attending outdoor events face higher heat stress. The Centre de Crise says heatwaves strain the body more when night temperatures stay high, and advises people to drink water, avoid intense activity during the hottest hours and check on people who need help.
The subject is a national Belgian heat warning issued by the , known in French as the and in Dutch as the . The alert concerns chaleur, or heat, across much of during the final days of June 2026. It sits alongside 's public-health heat and ozone plan, coordinated through federal, regional and community authorities.
Background
The defines a national climatological heatwave when the maximum temperature at reaches at least 25.0C for five consecutive days, including at least three days at 30.0C or more. The says heatwave risk is very probable in and is expected to become more frequent and intense as the climate changes.
Impact
Regional — The IRM forecast points to regional differences: the coast stays cooler at around 24C on Sunday and 20C on Monday, while Campine, Gaume and Belgian Lorraine remain among the warmer areas, reaching up to 32C on Sunday and 28C on Monday.
Local — Brussels and the central belt face highs around 30C on Sunday before dropping to 26C on Monday and about 25C on Tuesday, according to the IRM forecast.
What it means for you
Drink water regularly, avoid strenuous activity in the hottest hours, keep homes cool where possible, check on vulnerable neighbours or relatives, and call 112 if someone develops a very high body temperature or severe symptoms.
Who, where and what
Key people, places and terms in this story
The Royal Meteorological Institute is Belgium’s official weather service and national forecaster. It matters as the authority issuing and explaining Belgian weather warnings, including heat and thunderstorm alerts.
country under a heat warning and affected by the heatwave risk
dateline location for the update
warmer area forecast to reach up to 32C on Sunday
temperature reference point for defining a national climatological heatwave
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country under a heat warning and affected by the heatwave risk
dateline location for the update
warmer area forecast to reach up to 32C on Sunday
temperature reference point for defining a national climatological heatwave
warmer area forecast to reach up to 32C on Sunday
area covered by the heat alert
warmer area forecast to reach 28C on Monday
The Royal Meteorological Institute is Belgium’s official weather service and national forecaster. It matters as the authority issuing and explaining Belgian weather warnings, including heat and thunderstorm alerts.
national forecaster issuing the heat warning and forecast
says Belgium's heat and ozone plan is active
advises the public on heatwave health precautions
Dutch name for the Royal Meteorological Institute
says heatwave risk is very probable in Belgium
active plan to limit health impacts during heat and ozone conditions
Sources & evidence
- View sourceRoyal Meteorological Institute of Belgium (IRM) - Warnings in BelgiumPrimaryofficial· meteo.be· 28 June 2026Retrieved 28 June 2026· 96 days agodate verified· Dated
- View sourceRoyal Meteorological Institute of Belgium (IRM) - Forecast for the coming daysofficial· meteo.beRetrieved 28 June 2026date unknown
- View sourceSPF Public Health - Heat and ozone peaks planofficial· health.belgium.be· 22 June 2026Retrieved 28 June 2026· 102 days agodate verified· Dated
- View sourceNational Crisis Centre - Heatwaveofficial· centredecrise.beRetrieved 28 June 2026date unknown
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This briefing was prepared with AI assistance and reviewed by a Belgium Impulse editor before publication. methodology.