If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Corn Islands: The hottest months are usually April and May with an average temp of 80°F, while the coldest months are January and February with an average of 77°F. The rainiest months in Corn Islands are July, June, August, and October, with each month seeing an average of 18 inches of rainfall.