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Guide to San Antonio weather in March. The average maximum daytime temperature in San Antonio in March is a warm 23Â°C (73Â°F). The average night-time temperature is usually a cool 10Â°C (50Â°F). There are usually 7 hours of bright sunshine each day, which represents 56% of the 12 hours of daylight.
San Antonio averages 10 days in December when the thermometer reaches into the 70s Â°F (over 21 Â°C). Temperatures above 90 Â°F (32 Â°C) are not expected here this month. The thermometer dips to freezing or below on an average of 5 nights. December can get as cold as 10 Â°F (-12 Â°C), but that rarely happens.