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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 weather essentials. San Antonio generally has a temperate climate which makes it ideal for visitors, except in the summer (including the months of May and September!) when it can get extremely hot and sometimes humid. It's not uncommon for temps to reach 90 degrees and above during the summers, so unless you love to sweat, leave out San Antonio for your summer vacation plans. The best time to visit is in during the months just before and just after Winter, when rain is less likely and the temperatures are generally mild, closer to 50 degrees (although it still can get colder in the Winter). Fall and Spring are when you're likely to encounter rain, especially in September and May.