Overview
- The KNMI issued code yellow for multiple provinces on Wednesday as daytime highs reach about 30–35°C and nights remain unusually warm with tropennights in some areas.
- The RIVM activated the National Heat Plan for parts of the country, prompting official advice to drink water, keep homes cool and never leave children or pets in parked cars.
- GGD Groningen issued swim warnings for blue‑green algae at the Hoornsemeer and Paterswoldsemeer, and some municipal bodies applied the Tropisch Weer Scenario to relax terrace rules and other local regulations.
- Firefighters responded to at least two heat-related field fires in Drenthe that were largely brought under control, and the NVWA reported a sharp rise in heat-related animal reports from 277 in 2024 to 700 in 2025.
- Forecasters expect a westward wind shift on Thursday to bring temporary relief but warn that models show a possible return to very warm conditions starting Sunday or Monday, so authorities remain on alert.