If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Hirmentaz: The hottest months are usually July and August with an average temp of 56°F, while the coldest months are January and February with an average of 28°F. The rainiest months in Hirmentaz are December, May, July, and June, with each month seeing an average of 8 inches of rainfall.