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 Kotor: The hottest months are usually August and July, with an average temperature of 23°C, while the coldest months are January and February, with an average of 8°C. The rainiest months in Kotor are November, December, January and March, with each month seeing an average of 307 mm of rainfall.