San Antonio is starting the week in full-on sauna mode, with early-morning temperatures already in the upper 70s and dew points in the mid-70s making the air feel sticky. The city will warm to a high near 90°F today, with scattered showers and thunderstorms possible mainly between about 10 a.m. and 4 p.m. Heat index values could push toward 100°F in some neighborhoods, so plan on a hot, uncomfortable afternoon.
Afternoon Showers And Quick Thunderstorms
The best window for showers and a few thunderstorms runs from late morning into mid-afternoon, roughly 10 a.m. to 4 p.m., with about a 25–30% chance of rain in town. Any storm that pops up could deliver brief heavy rain and gusty winds. Most spots will see less than a tenth of an inch of new rainfall, but lightning and sudden downpours could still slow the evening commute. South-southeast winds should run about 5–10 mph, with gusts near 20 mph this afternoon. According to the National Weather Service Austin/San Antonio, scattered pop-up storms are the main story, continuing the pattern we highlighted in our stormy smackdown outlook last Wednesday.
Heat Holds Through The Week
Ridging over the region will keep most afternoons hot and humid, with highs climbing into the low-to-mid 90s from Tuesday through Friday. With dew points staying elevated, heat index values are expected to reach the 100–105°F range at times, especially during the late afternoon hours. Anyone working or exercising outdoors should build in frequent breaks, stay hydrated and watch for signs of heat illness.
Tonight And Tuesday
Tonight will be partly cloudy with a low near 76°F, as southeast winds ease a bit overnight. Tuesday turns hotter, with highs near 92°F and only a slight chance of an isolated inland shower. It will be another steamy afternoon, with heat indices near 101°F in some neighborhoods.
How To Stay Safe
If you need a break from the heat, the City of San Antonio maintains an interactive heat-safety and cooling-center hub with locations and tips. For the full list of cooling centers and resources, visit SA.gov. Keep an eye on afternoon radar, steer clear of driving through standing water and remember that lightning and sudden gusty winds are the main hazards today.
