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The Netherlands experienced its warmest day of 2025 so far on Thursday, as temperatures surged across the country, reaching nearly 30 degrees in some areas. According to KNMI, the highest temperature was recorded in Westdorpe, Zeeuws-Vlaanderen, at 29.5 degrees.

In De Bilt, the national reference station, the maximum reached 27.4 degrees, marking the second official summer day of the year. The first occurred just a day earlier. Across most of the country, the weather was summery, with only the Wadden Islands staying below 25 degrees. Even there, conditions were unusually warm for early May, when typical temperatures range between 14 and 18 degrees, according to weeronline.

The warm conditions are the result of a prolonged stretch of sunshine and dry weather that has characterized the past week. With the ongoing May holiday, many residents took advantage of the rare combination of heat and clear skies to spend time outdoors.

Though the heat came close to triggering the first tropical day of the year—defined as temperatures of 30 degrees or higher—no official record was broken. The earliest tropical day ever recorded in the Netherlands remains April 21, 1968, when Venlo reached 32.2 degrees and Buchten in Limburg recorded 31.7 degrees.

The date-specific record for May 1 in De Bilt also remains unbroken. That record, set in 2005, stands at 28.5 degrees, with even higher values of 30.0 degrees in Eindhoven and Ell that same day.

Forecasters say a national heat record could still be broken on Friday, particularly in the central and southern regions. Inland areas may see temperatures between 25 and 28 degrees. The existing May 2 record in De Bilt is 26.3 degrees, set in 1990. The national record for all weather stations on that date is 27.5 degrees, registered in Twente and Soesterberg in 1966. According to meteorologists, this record may fall on Friday.