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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 most years, San Antonio averages a daily maximum temperature for April that's between 78 and 83 degrees Fahrenheit (25 to 29 degrees Celsius). The minimum temperature usually falls between 55 and 62 Â°F (13 to 16 Â°C). The days at San Antonio warm steadily during April.