Low temperatures rarely fall below the mid-70s°F (24°C), creating a substantial diurnal range that offers little nighttime relief. 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 Year Round: Monthly Breakdown
This season often brings the highest variability, as cold fronts can collide with advancing warm air, producing sharp temperature changes in a single week. Fall (September–November) September remains warm, often hovering near 90°F (32°C), but October and November deliver a noticeable cooling trend.
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.
San Antonio TX Average Temperatures Year Round Monthly Climate Patterns
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. 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.
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