May weather forecast in San Antonio

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May in San Antonio is the rainiest month of the year. In May, the weather in San Antonio is typically hot. Average daily high temperature in May is about 29 degrees above zero. On average, San Antonio has 17 sunny, 10 rainy, and 4 partly cloudy days in May. The rains are usually heavy. May as well as June, July, August, and September is considered the most uncomfortable time to visit San Antonio.

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