热带雨林
Despite the fact that it is located just outside the tropics, Santos has a tropical rainforest climate (Af) with no real dry season. Tropical rainforest climates are typically found near the equator, so Santos featuring this type of climate is an exceptional situation. All months of the year averages more than 60 mm of rainfall during the course of the year. Santos features warm weather throughout the year, though June in Santos is somewhat cooler (and drier) than January. The average temperature in the city during the month of June is 23 °C, while the average temperature in January is 28 °C. Precipitation in Santos is very high, amounting to annually. Santos lies in one of the few isolated regions of Brazil outside of the tropical Amazon Basin that receive more than of total average precipitation annually, although nearby Ubatuba, approximately to the east-northeast, is considerably wetter than Santos, receiving an average of of precipitation annually. The Köppen Climate Classification subtype for this climate is "Af" (Tropical Rainforest Climate).