Friday, April 24, 2026 started off warm and soupy in San Antonio, with temperatures near 74°F and plenty of sticky morning humidity. Thermometers are expected to climb to about 87°F this afternoon, with a slight shot at showers and a few thunderstorms between 1 p.m. and 4 p.m.; any storm that manages to pop could turn strong. The bigger story is the weekend and beyond, as highs push into the low 90s and heat indices flirt with or top 100°F through early next week. If you have outdoor plans, build in extra water, shade, and shorter stints outside during the peak afternoon heat.
Weekend Heat Builds
The National Weather Service is calling for highs near 91°F on both Saturday and Sunday, then a bump to around 94°F on Monday and Tuesday, with heat index values in the mid to upper 90s and a few spots near 103°F across parts of South Texas, especially the Rio Grande Plains, according to NWS Austin/San Antonio. That mix of heat and humidity will make mid afternoon the roughest time to be outside.
Beat The Heat
The City of San Antonio keeps an updated list of cooling resources and heat safety tips for residents; check their site for cooling center locations and programs if you or someone you know does not have air conditioning, according to the City of San Antonio. Try to avoid heavy outdoor work during the hottest hours, stay on top of fluids, and check in on older neighbors and young children.
Afternoon Storms Possible
There is a low but legitimate chance for isolated showers and thunderstorms this afternoon, roughly in the 1 to 4 p.m. window, with a 10 to 20 percent probability and the potential for isolated severe storms; if storms fire, the main concerns would be large hail and damaging wind gusts, according to NWS Austin/San Antonio. Morning low clouds and patchy fog should lift to VFR conditions by late morning, but if your plans involve late day outdoor activities, it is smart to keep an eye on radar and short term updates.
Whenever possible, schedule outdoor time during the cooler morning hours and check the latest forecast before you head out. Updates will follow if any watches, warnings, or higher storm probabilities are issued.
