- Warning valid below 800 m a.s.l. - Possible impacts: Moderate risk of circulatory problems. - Recommendations for action: Drink (preferably unsweetened) liquids regularly and in sufficient quantities (at least 1.5 litres a day). 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. - Highest temperatures and humidity: 32 - 34 °C, 40 - 60 % - Lowest night temperatures: 19 - 22 °C