If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Tortuguero: The hottest months are usually September and May, with an average temperature of 26°C, while the coldest months are January and February, with an average of 25°C. The rainiest months in Tortuguero are July, November, August and June, with each month seeing an average of 494 mm of rainfall.