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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 sees an average of eight days a year with 100-plus degree temperatures. San Antonio averages 16 days a year of freezing weather, with one day a year dropping to 20 Â°F.Freezing temperatures normally occur from November to March. But no matter how cold the night gets, the weather in San Antonio thaws during the day.he average high and low temperatures are listed below by month and annually for San Antonio, in both degrees Fahrenheit and Celsius. Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.