The Netherlands is set for a sweltering weekend as the astronomical summer kicks off with soaring temperatures and blazing sunshine. Forecasters predict inland highs of up to 35°, prompting event organisers across the country to implement emergency heat measures — or cancel altogether.

After a sunny start on Friday, temperatures will rise sharply across the weekend. On Saturday — the first official day of summer — much of the country will see tropical conditions, with highs between 30° and 32°. Coastal areas will be slightly cooler due to sea breezes, but even there the mercury could hit 31°

Sunday looks set to be even hotter. In the southern and eastern regions, including Limburg and Twente, temperatures could climb to as high as 35°, with the feel-like temperature approaching 40° due to the lack of wind.

The high sun intensity, rated at level 7, adds to the risk. “Good sun protection is essential,” meteorologist Jordi Huirne from Buienradar told RTL Nieuws.

Night-time temperatures will offer little relief. Cities in particular face so-called “sticky nights”, with minimums staying above 20°. Huirne said Saturday could break long-standing heat records, including the 30.4° degrees recorded in De Bilt on 21 June 1936.

Several major events have taken action. The organisers of Op de Ring, a festival taking place on Amsterdam’s A10 ring road, are setting up extra water points, shaded areas and medical support to help visitors cope with the extreme conditions.

Elsewhere, some events have been cancelled entirely. Several sports events in Overijssel have been scrapped, and the Philzuid symphony orchestra has called off its outdoor concerts in Eindhoven and other cities. Other organisers are operating under special heat protocols to protect attendees and staff.

The government has not issued a nationwide weather warning, but local councils are urging people to take precautions — drink water regularly, avoid direct sun during the hottest hours, and check on vulnerable neighbours.