Weather is probably a major factor when you plan your trip to Alt Sankt Johann, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and July, with an average temperature of 11°C, while the coldest months are February and January, with an average of -4°C. The rainiest months in Alt Sankt Johann are August, July, June and May, with each month seeing an average of 271 mm of rainfall.