If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Cieszyn: The hottest months are usually August and July with an average temp of 64°F, while the coldest months are January and February with an average of 33°F. The snowiest months in Cieszyn are December, November, January, and February, with each month seeing an average of 9 inches of snowfall.