San Antonio/ Weather & Environment

Last Cool Morning Before the Sizzle in San Antonio

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Published on October 18, 2026
Last Cool Morning Before the Sizzle in San AntonioSource: Google Street View

San Antonio gets one more cool, sunny morning before summerlike heat begins marching back in. Sunday’s high should reach about 73 degrees, with light northeast winds and no rain expected across the city.

Cool Sunday, Then A Steady Warm-Up

Temperatures will rise from 50 degrees during the morning into the low 70s this afternoon, according to the National Weather Service. Tonight will turn partly cloudy with a low near 54 and light winds.

Monday stays mostly sunny and warmer, with a high near 77. Tuesday climbs to about 83, followed by sunny Wednesday conditions and a high near 86 as the fall chill retreats.

80s Return By Thursday

Thursday and Friday are forecast to be dry, with highs in the 80s and overnight lows in the low to mid-60s. Saturday should remain mostly sunny and warm near 88, with dry conditions forecast and little reason to rearrange most outdoor plans.

Clear Skies And Quiet Winds Ahead

The extended forecast remains dry, with no watches, warnings or advisories listed for the San Antonio area. Sunday’s comfortable afternoon is the best bet for lighter layers, while anyone planning outdoor activities later in the week should expect stronger sun and warmer temperatures by midday.