 When the wet season occurs during a warm season , or summer , precipitation falls mainly during the late afternoon and early evening . In the wet season , air quality improves , fresh water quality improves , and vegetation grows substantially , leading to crop yields late in the season . Rivers overflow their banks , and some animals retreat to higher ground . Soil nutrients diminish and erosion increases . The incidence of malaria increases in areas where the rainy season coincides with high temperatures , particularly in tropical areas . Some animals have adaptation and survival strategies for the wet season . Often , the previous dry season leads to food shortages in the wet season , as the crops have yet to mature . 
