If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Cieszyn: The hottest months are usually August and July, with an average temperature of 18°C, while the coldest months are January and February, with an average of 1°C. The snowiest months in Cieszyn are December, November, January and February, with each month seeing an average of 24 cm of snowfall.