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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.
Summers in San Antonio are hot and June, July and August feature the hottest weather and climate of the year, when temperatures can rise above 35Â°C / 95Â°F. San Antonio averages more than 300 days of sunshine each year. Winter in San Antonio is a mild season, with December and January containing the coolest climate of the year. Daytime temperatures in winter are around 16Â°C / 60Â°F, but temperatures can drop to 3Â°C / 37Â°F. Snowfalls are rare and the annual average snowfall is around 2 cm / 0.7 inches. San Antonio's annual average precipitation is 79 cm / 31 inches. San Antonio Weather and Climate Chart (Averages)