- Warning valid below 800 m a.s.l. - Possible impacts: Significant risk of circulatory problems. - Recommendations for action: Drink (preferably unsweetened) liquids regularly and in sufficient quantities (at least 1.5 litres a day). Protect yourself from direct sunlight (stay in the shade, wear suitable clothing, a hat, sunglasses and sun cream). Allow air to circulate through your home or other buildings before the hot part of the day, i.e. during the night and early in the morning. Avoid vigorous physical activity or compensate for salt loss during or after sport activities. Contact those around you who fall into the risk category and ensure that they are well and able to follow the existing recommendations. Do not leave people or animals unattended in cars. Find out about the possible adverse effects of heat stress. - Highest temperatures and humidity: 31 - 34 °C, 30 - 45 % - Lowest night temperatures: 17 - 21 °C - Peak phase of the event: Tue 12 - Thu 12 - Temporary mitigation: due to thunderstorms on, Mon 30.06.2025