If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Isla de Utila: The hottest months are usually May and June, with an average temperature of 26°C, while the coldest months are January and February, with an average of 23°C. The rainiest months in Isla de Utila are November, October, January and December, with each month seeing an average of 259 mm of rainfall.