San Antonio woke up Monday to thick, muggy air and a hazy skyline, with temperatures already near 79°F and visibility knocked down by the haze. This afternoon (Monday, May 18, 2026), the high is expected to land around 93°F, with heat index values pushing up to 101. South-southeast winds near 15 mph, gusting to around 30 mph, will blow under mostly cloudy skies, and only a slight chance of a brief shower is on the table. The end result: an afternoon that feels uncomfortably warm and breezy for anyone outside.
Afternoon Heat And Gusty Winds
Across the metro area, temperatures will top out in the low 90s, with peak heat arriving in the mid-afternoon. It is a good time to bring water and skip strenuous outdoor activity during the hottest hours. South-southeast winds around 15 mph, with gusts up to 30 mph, could knock around unsecured items and kick up pockets of dust. A more active pattern sets up by Tuesday, with shower and thunderstorm chances increasing late Tuesday into Tuesday night and staying elevated through midweek. According to NWS Austin/San Antonio, heavy rain and localized flooding are possible.
Commute And Cooling Options
If storms do fire up Tuesday night, plan on slower evening commutes, as brief downpours and lightning can cut visibility and leave standing water on low-lying roads. For relief from the heat, the City of San Antonio maintains cooling and resilience centers and may open additional sites during extreme heat. See City of San Antonio for locations and guidance. Ahead of the gusty afternoons, secure loose patio furniture and check in on older neighbors, children, and pets.
What To Watch
Keep an eye on radar late Tuesday afternoon (Tuesday, May 19, 2026) and have a backup plan ready if you have outdoor events scheduled. Flash flooding and damaging gusts are the main concerns if storms manage to organize. Charge phones, stay tuned to local alerts, and move to higher ground if flood warnings are issued.
