San Antonio 20 Day Weather Forecast 2025 Weather. Weather.com brings you the most accurate monthly weather forecast for san antonio, tx, united states with average/record and high/low temperatures, precipitation and more. Myforecast is a comprehensive resource for online weather forecasts and reports for over 72,000 locations worldcwide.

30dayweather long range weather forecasts predict ideal conditions for a storm. Get the monthly weather forecast for san antonio, tx, including daily high/low, historical averages, to help you plan ahead.