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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.
In August, the warmest month, the average day time temperature rises to 94.7Â°F. The driest month in San Antonio is January with 1.66 inches of precipitation, and with 4.72 inches May is the wettest month.