If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Rio Hato: The hottest months are usually March and April, with an average temperature of 26°C, while the coldest months are January and December, with an average of 26°C. The rainiest months in Rio Hato are October, November, September and August, with each month seeing an average of 340 mm of rainfall.