Average highs drop into the 70s and then the 60s°F (21–27°C), while overnight lows slide from the 60s early in fall to the 40s and 50s°F (4–12°C) by late November. Fall (September–November) September remains warm, often hovering near 90°F (32°C), but October and November deliver a noticeable cooling trend.
San Antonio TX Average Temperatures Summer Peaks and Seasonal Variations
This season often brings the highest variability, as cold fronts can collide with advancing warm air, producing sharp temperature changes in a single week. Winter (December–February) Despite its southern location, San Antonio experiences occasional cold snaps, though prolonged freezes are uncommon.
Low temperatures rarely fall below the mid-70s°F (24°C), creating a substantial diurnal range that offers little nighttime relief. These values are based on long-term climate records and serve as a reliable reference for planning purposes.
San Antonio TX Average Temperatures Summer Peaks and Seasonal Swings
This dynamic creates distinct temperature phases rather than a simple gradual climb or decline. 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.
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