San Antonio rolled into Tuesday under clear, muggy skies, with the official station clocking about 77°F and a dew point near 73°F. The warm start will not last long. The city is expected to heat up fast, with a high near 97°F this afternoon and a heat index around 103°F. The most oppressive stretch will hit in the midafternoon, and with only light south winds on tap, shade and air conditioning will be doing the heavy lifting.
Afternoon Heat and What to Expect
Sun wins the day across the metro this afternoon, with south winds around 0–5 mph and very low rain chances. Forecasters expect highs near 97°F today, then a climb toward 100°F on Wednesday, with heat index values pushing into the mid 100s, as high as about 107°F, by midweek. No Heat Advisory is in effect for the San Antonio area this morning, but forecasters do note ongoing river flooding in parts of South Texas, including the Nueces and Frio basins, and they are keeping an eye on Tropical Storm Bertha in the northeastern Gulf for possible late week impacts, according to NWS Austin/San Antonio.
Midweek Outlook And A Gulf System To Watch
Tropical Storm Bertha is parked over the northeastern Gulf and could funnel extra humidity into South Texas later this week. That would nudge late week rain chances higher and make overnight lows feel even steamier. For now, trends favor the system staying far enough north to limit direct impacts on San Antonio, but the track could still wobble. If you have outdoor plans Thursday through the weekend, it is worth checking for forecast updates. Should Bertha send more moisture this way, expect a better chance of isolated storms toward late in the weekend.
Local Resources And Heat Safety
Hydration and timing are key for the next few days. Keep water handy, take regular breaks from outdoor work during peak heat from roughly noon to 6 p.m., and look in on older neighbors or anyone without air conditioning. The City of San Antonio maintains a list of cooling sites and heat safety guidance. Call 3-1-1 or visit the City of San Antonio website for locations and hours. If you work outside, aim for the cooler early morning or evening hours and have a clear plan in place in case of heat related illness.
Commute Notes And Other Impacts
Morning commutes will be warm and sticky, and the ride home will be noticeably hotter, especially in parking lots and on sun soaked side streets. Make sure your vehicle's cooling system is in good working order and keep water in the car for longer drives. With winds staying light, any stray showers that do form are unlikely to cool the city in a meaningful way, and there are currently no local watches or warnings posted for Bexar County. Keep an eye on the forecast through the week and scale back strenuous outdoor activity in the afternoon if you can.
