If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Curridabat: The hottest months are usually March and April with an average temp of 68°F, while the coldest months are January and February with an average of 66°F. The rainiest months in Curridabat are October, June, September, and August, with each month seeing an average of 26 inches of rainfall.