Low temperatures rarely fall below the mid-70s°F (24°C), creating a substantial diurnal range that offers little nighttime relief. Year-Round Temperature Patterns The city sits in south-central Texas, where prevailing winds from the Gulf of Mexico interact with continental air masses.
San Antonio TX Average Temperatures Compared to the Monthly Climate Guide
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. 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.
Monthly Temperature Averages The following table summarizes typical high and low temperatures, along with average conditions for each month. 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 Compared to Monthly Patterns
This overview breaks down the data into practical insights without sacrificing scientific accuracy. 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.
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