The Netherlands is set to experience a significant heatwave starting tomorrow, following a cool and rainy June. Temperatures are expected to rise well above average, potentially exceeding 30 degrees Celsius, particularly in the southern provinces. A heat plan has been activated nationwide as warm air from Southern Europe moves in. Alongside the heat, there is a high probability of thunderstorms, beginning as early as tomorrow evening and intensifying on Friday, potentially bringing heavy rain, hail, and strong winds. While Saturday will remain warm, with temperatures between 25 and 31 degrees Celsius, a sea breeze will offer some relief along the coast. Forecasts suggest the heat may continue into Sunday, with temperatures potentially rising above 30 degrees Celsius again inland, mirroring similar conditions experienced last year.