Heat indices can push perceived temperatures into the triple digits, especially when humidity from the Gulf combines with stagnant high-pressure systems. 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.
San Antonio TX Average Temperatures Fall Shifts and Seasonal Breakdown
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. San Antonio, Texas, experiences a humid subtropical climate that shapes daily life and seasonal rhythms across the region.
Snow is infrequent, but icy conditions can disrupt daily life when they do occur. Low temperatures rarely fall below the mid-70s°F (24°C), creating a substantial diurnal range that offers little nighttime relief.
San Antonio TX Average Temperatures Fall Shifts
This transition period is generally regarded as the most comfortable window for outdoor activity. Fall (September–November) September remains warm, often hovering near 90°F (32°C), but October and November deliver a noticeable cooling trend.
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