Its proximity to the equator tends to make its temperature to rise and fall into very small range: from as low as to as high as . The Köppen climate system classifies Santa Maria climate as tropical monsoon ("Am") due to its location and precipitation characteristics. This means that the municipality has two pronounced seasons: dry and wet seasons. The municipality's driest months are from November to April where it receives less than of rainfall. On the other hand, maximum rain period is from June to September where it receives not more than of rainfall. Hail and snow is not observed in the municipality.