World San Antonio Weather Forecast June 20: Temperatures, Rain Chances & More by Ibrahim Khalil - World Editor June 20, 2026 by Ibrahim Khalil - World Editor June 20, 2026 San Antonio Weather Forecast for June 20: Highs Near 90°F, 55% Chance of Rain San Antonio residents and visitors should prepare for a warm, partly cloudy day on Saturday, June … 0 FacebookTwitterPinterestEmail