If you're hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Mandvi: The hottest months are usually May and June with an average temp of 85°F, while the coldest months are January and February with an average of 74°F. The rainiest months in Mandvi are July, August, September, and June, with each month seeing an average of 7 inches of rainfall.