You might spend a lot of your vacation inside, but if you want to see more of the area, taking a look at local weather data can help you. The hottest months are usually August and July with an average temp of 54°F, while the coldest months are January and February with an average of 26°F. The snowiest months in Hallstatt are December, January, November, and February, with each month seeing an average of 5 inches of snowfall.