The average temperature in San Antonio in April for a typical day ranges from a high of 85°F (29°C) to a low of 59°F (15°C). Some would describe it as pleasantly warm and breezy. For comparison, the hottest month in San Antonio, August, has days with highs of 100°F (38°C) and lows of 76°F (24°C). The coldest month, January has days with
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weather in san antonio in april