The summer will return on Wednesday. A high-pressure area will result in mostly dry and warmer weather than recently. However, absolutely clear skies are not expected: A north-westerly air stream will bring some patches of clouds. The high-pressure weather will continue in the second half of the week, although the upper air stream will increasingly turn westward respectively south-westward. Simultaneously, the air will become somewhat muggier and the risk for heat thunderstorms will occasionally increase. The mostly friendly weather will continue: Summer weather is expected once more until next weekend. Warm Mediterranean air will result in strongly increasing temperatures. The frost line will temporarily rise above 4000 m above sea level.