If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Gamboa: The hottest months are usually March and April with an average temp of 80°F, while the coldest months are January and February with an average of 79°F. The rainiest months in Gamboa are July, August, June, and November, with each month seeing an average of 15 inches of rainfall.