Fall (September–November) September remains warm, often hovering near 90°F (32°C), but October and November deliver a noticeable cooling trend. Heat indices can push perceived temperatures into the triple digits, especially when humidity from the Gulf combines with stagnant high-pressure systems.
San Antonio TX Average Temperatures Seasonal Guide and What to Expect
Average highs in January typically reach the mid-60s°F (18°C), with overnight lows averaging just above freezing in the northern suburbs and low 40s°F (5–7°C) within the city core. Low temperatures rarely fall below the mid-70s°F (24°C), creating a substantial diurnal range that offers little nighttime relief.
Understanding the average temperatures here helps residents and visitors plan activities, choose appropriate clothing, and manage energy use throughout the year. Monthly averages reveal a pronounced midsummer peak and a mild winter season, with noticeable swings between night and day during transitional periods.
San Antonio TX Average Temperatures by Season
These values are based on long-term climate records and serve as a reliable reference for planning purposes. This season often brings the highest variability, as cold fronts can collide with advancing warm air, producing sharp temperature changes in a single week.
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