Overview: Hallstatt Hallstatt (Austria) is a place with a mild climate. Temperatures during the day are in the range from 2 °C (36 °F) in January to 23 °C (73 °F) in July. The least rainy month in Hallstatt is October with its 11 days of rain, the rainiest month is June, when it rains 18 days. Temperatures during the night go from -6 °C (21 °F) in January to 10 °C (51 °F) in July.