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 Santa Catarina Pinula: The hottest months are usually April and March, with an average temperature of 20°C, while the coldest months are January and December, with an average of 18°C. The rainiest months in Santa Catarina Pinula are September, June, May and August, with each month seeing an average of 407 mm of rainfall.