Switzerland records hottest June day in history as Basel reaches 38°C during European heatwave

Basel reached 38°C on June 25, 2026, giving Switzerland its hottest June day on record, according to MeteoSuisse.

The federal weather office said the country exceeded 37°C in June for the first time, breaking a benchmark that had stood since 1947. The new reading came from the Basel weather station, which was also the site of the previous June record.

Record heat in Switzerland

The Basel temperature was reported as the latest sign of an intense heat spell sweeping across Western Europe. The Guardian reported that Switzerland had broken its June record, citing MeteoSuisse confirmation, while other coverage echoed the 38°C reading in Basel.

MeteoSuisse said the 1947 June mark had fallen as temperatures climbed above a level Switzerland had never reached in that month before.

Wider European heatwave

The Swiss record was part of a larger regional heatwave that was already driving public-health alerts and pressure on daily life across Europe. On the same day, the UK also set a new June temperature record, underscoring how widespread the heat event had become.

Authorities in other countries were dealing with heat-related strain on services and infrastructure, and French officials were among those facing disruption during the same weather system.

What to watch next

The main verification question remaining is whether MeteoSuisse later confirms 38°C as the final official national June maximum after full validation. Forecasters and officials are also watching whether additional Swiss stations approach or exceed the Basel reading later in the day.

For now, the evidence supports a clear public-health story: a new Swiss June temperature record, set in Basel, in the middle of a severe Western European heatwave.