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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, Texas, a large Central Texas city, lies near the border of the Gulf Coastal Plains. This location means San Antonio typically experiences a humid subtropical climate with hot, muggy summers and mild, humid winters. San Antonio falls under United States Department of Agriculture (USDA) Hardiness Zone 8b. San Antonio gardeners should select plants according to bloom time, bloom color, hardiness zone and intended use. Various spring flower varieties thrive in San Antonio gardens.