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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: Annual Weather Averages. July is the hottest month in San Antonio with an average temperature of  25Â°C (77Â°F) and the coldest is January at 11Â°C (52Â°F) with the most daily sunshine hours at 10 in July. The wettest month is October with an average of 66mm of rain.