Valid: from 18.6. 12:00 to 23.6. 20:00
- Warning valid below 800 m a.s.l.
- Possible impacts: Significant risk of circulatory problems and physical discomfort.
- Recommendations for action: Drink at least 1.5 litres per day, preferably unsweetened and non-alcoholic drinks. Keep your body cool: seek shade and cool rooms, protect yourself with suitable clothing, headgear and sunscreen, shade windows and ventilate your home early in the morning. Keep in touch with at-risk people in your neighbourhood. Do not leave people or animals in parked cars. Follow the recommendations of the Federal Office of Public Health FOPH.
- Highest temperatures and humidity: 31 - 36 °C, 30 - 45 %
- Lowest night temperatures: 17 - 22 °C
- Peak phase of the event: Sun 12 - Tue 20
- Temporary mitigation: due to thunderstorms on, Fri 19.06.2026
General advice in the event of a heatwave:
- Solar radiation is at its strongest between 11 a.m. and 3 p.m., with the hottest time in the late afternoon (3 p.m. to 6 p.m.), so restrict activities in the open air to morning and evening, and where possible remain in the shade.
- Avoid vigorous physical activity wherever possible. If you are doing any physical activity, hydrate sufficiently (with cool, alcohol-free drinks).
- Protect yourself from direct sun (with shade, appropriate clothing, head covering, sunglasses, sunscreen etc.
- Wear loose, light-coloured clothing.
- Ensure that your body gets sufficient liquid (at least 1.5 to 2 litres a day), and compensate for salt and water loss simultaneously. Water containing sodium, juices, soups, fruits with a high water content, such as melons, cucumbers, tomatoes, strawberries and peaches, are all useful for hydration.
- Eat fresh, cool and light meals, and spread these out over the course of the day.
- Compensate for salt loss during or after sporting activities.
- Make the most of the lower night-time temperatures: allow plenty of outside air to circulate through buildings.
- Cool down with a cool shower or bath.
21°
