You'll likely spend much of your trip indoors, but if you're planning to venture beyond the casino, looking at local weather trends is a good idea. The hottest months are usually July and August with an average temp of 63°F, while the coldest months are January and February with an average of 34°F. The snowiest months in Český Krumlov are December, January, November, and February, with each month seeing an average of 6 inches of snowfall.