Overview: RosenheimRosenheim (Germany) in general has a mild climate. Temperatures during the day are in the range from 3 °C (37 °F) in January to 25 °C (77 °F) in July. The least rainy month in Rosenheim is October with its 11 days of rain, the rainiest month is June, when it rains 17 days. Temperatures during the night go from -5 °C (24 °F) in January to 13 °C (55 °F) in July.