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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.
The average recorded low temperature in San Antonio on May First is 62 degrees Fahrenheit and the average low on the last day of May is 69 degrees. San Antonio typically receives an average of 4.72 inches of precipitation during the month.