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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 Weather. San Antonio Weather and When to Go. San Antonio weather essentials. San Antonio generally has a temperate climate which makes it ideal for visitors, except in the summer (including the months of May and September!) when it can get extremely hot and sometimes humid.