If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Karwi: The hottest months are usually May and June with an average temp of 92°F, while the coldest months are January and December with an average of 67°F. The rainiest months in Karwi are July, August, September, and June, with each month seeing an average of 10 inches of rainfall.