Heat Rises: Up to 35°C This Week as Summer Could Already Make History

Belgium is bracing for a severe heatwave, with temperatures set to climb as high as 35 degrees Celsius by the end of the week. Meteorologists at the Royal Meteorological Institute (IRM) predict that Wednesday through Friday will see the highest temperatures. This intense heat is attributed to a "heat dome" effect, with thunderstorms from France paradoxically boosting temperatures before potentially bringing a slight cool-down later in the week.

This episode is shaping up to be the second heatwave of the year, a rare occurrence so early in the season. If three consecutive days reach 30 degrees Celsius, this heatwave will officially be recognized as starting on July 6. This would mark only the second time since records began that two heatwaves have followed each other so rapidly. The duration is expected to be similar to the late June heatwave, though maximum temperatures might be slightly lower.

Looking ahead, the outlook is concerning. While thunderstorms are anticipated from Thursday or Friday, offering a potential temporary return to seasonal norms, the long-term forecast is less optimistic. Meteorologists express concern about Belgium's ability to escape this heat tunnel, with several models predicting significantly above-normal temperatures for the last week of July. This trend suggests that the summer of 2026 could become one of the most remarkable on record in Belgium, potentially even an absolute record if August does not bring exceptionally cold and rainy weather.