If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Sinop: The hottest months are usually September and August with an average temp of 81°F, while the coldest months are July and June with an average of 78°F. The rainiest months in Sinop are February, January, December, and March, with each month seeing an average of 14 inches of rainfall.