Fall (September–November) September remains warm, often hovering near 90°F (32°C), but October and November deliver a noticeable cooling trend. 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 Planning Guide
This overview breaks down the data into practical insights without sacrificing scientific accuracy. 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.
Heat indices can push perceived temperatures into the triple digits, especially when humidity from the Gulf combines with stagnant high-pressure systems. Overnight lows move from the 40s°F (4–6°C) early in the year to the 60s°F (15–20°C) by late spring.
San Antonio TX Average Temperatures Planning Guide
Understanding the average temperatures here helps residents and visitors plan activities, choose appropriate clothing, and manage energy use throughout the year. This transition period is generally regarded as the most comfortable window for outdoor activity.
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