If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Corn Islands: The hottest months are usually April and May, with an average temperature of 27°C, while the coldest months are January and February, with an average of 25°C. The rainiest months in Corn Islands are July, June, August and October, with each month seeing an average of 451 mm of rainfall.