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 Chugchilan: The hottest months are usually May and August, with an average temperature of 11°C, while the coldest months are September and August, with an average of 10°C. The rainiest months in Chugchilan are March, November, December and February, with each month seeing an average of 405 mm of rainfall.