Heat indices can push perceived temperatures into the triple digits, especially when humidity from the Gulf combines with stagnant high-pressure systems. Summer (June–August) Summer in San Antonio is defined by sustained heat, with average highs consistently in the mid-90s°F (35°C) during June, July, and August.
San Antonio TX Average Temperatures Historical Trends and Seasonal Patterns
This season often brings the highest variability, as cold fronts can collide with advancing warm air, producing sharp temperature changes in a single week. Monthly averages reveal a pronounced midsummer peak and a mild winter season, with noticeable swings between night and day during transitional periods.
Seasonal Breakdown by Temperature Spring (March–May) March begins with average highs in the upper 60s°F (around 20°C), rising steadily to the mid-80s°F (29–30°C) by May. Low temperatures rarely fall below the mid-70s°F (24°C), creating a substantial diurnal range that offers little nighttime relief.
San Antonio TX Average Temperatures Historical Trends and Seasonal Patterns
Understanding the average temperatures here helps residents and visitors plan activities, choose appropriate clothing, and manage energy use throughout the year. Month Average High (°F) Average Low (°F) Average High (°C) Average Low (°C) January 66 43 19 6 February 68 45 20 7.
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