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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.
Best Times to Visit San Antonio. The best time to visit San Antonio is from November to April, when the weather is comfortable and the hotel rates are lower. Summer sees the largest influx of tourists from in- and out-of-state.