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 Mangan: The hottest months are usually June and August, with an average temperature of 18°C, while the coldest months are January and February, with an average of 9°C. The rainiest months in Mangan are July, August, June and September, with each month seeing an average of 921 mm of rainfall.