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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.
Typically on 11 days this month the sky is mainly clear, with at most 30 percent cloud cover. Sunlight in October at San Antonio lasts for 11 hours and 26 minutes a day on average. The longest day of the month is the 1st with 11 hours and 52 minutes of daylight.