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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 and worst times to go to San Antonio. San Antonio is typically very mild and pleasant in spring (from around March through May) and late fall (November and December). If you're not a fan of the heat, avoid San Antonio from July through September, when temperatures are in the 90s (and sometimes 100s).