This season often brings the highest variability, as cold fronts can collide with advancing warm air, producing sharp temperature changes in a single week. San Antonio, Texas, experiences a humid subtropical climate that shapes daily life and seasonal rhythms across the region.
San Antonio TX Average Temperatures Night Day Breakdown
These values are based on long-term climate records and serve as a reliable reference for planning purposes. 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.
Year-Round Temperature Patterns The city sits in south-central Texas, where prevailing winds from the Gulf of Mexico interact with continental air masses. 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 Night Day Breakdown
Month Average High (°F) Average Low (°F) Average High (°C) Average Low (°C) January 66 43 19 6 February 68 45 20 7. This transition period is generally regarded as the most comfortable window for outdoor activity.
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