San Antonio, Texas – Relentless summer heat is making a return across South Central Texas, with dangerously hot conditions building into Monday, July 21st, and peaking again midweek. San Antonio could reach 99°F by 2 p.m., with heat indices topping 105°F, triggering a summer weather alert for anyone working or traveling outdoors.
According to the National Weather Service, the combination of high temperatures and increased humidity will create oppressive conditions through Wednesday, especially during afternoon hours. A Heat Index Warning may be issued if temperatures continue trending upward. The most affected areas include Bexar, Wilson, and Guadalupe counties.
Residents are urged to limit outdoor activity from 1 to 6 p.m., stay hydrated, and check on vulnerable populations. Local roadways such as I-35, Loop 410, and U.S. 281 may see pavement buckling or heat-related slowdowns due to vehicle strain. Power use may also spike, prompting grid conservation calls from CPS Energy.
By Tuesday, San Antonio sees only a slight dip in daytime highs (98°F), but muggy overnight lows will hover near 77°F, offering little relief. Heat risks remain elevated through the end of the week with consistent highs around 99°F and mostly sunny skies.
Prepare now for an extended stretch of oppressive heat and minimal overnight cooling.
🔍 Five-Day Forecast | San Antonio | Monday, July 21 – Saturday, July 26
- Monday: Mostly sunny and hot. High: 99°F. Wind SE 10–15 mph, gusts up to 25 mph.
- Monday Night: Partly cloudy. Low: 76°F.
- Tuesday: Partly sunny. High: 98°F. Wind SE 10–15 mph.
- Tuesday Night: Mostly clear. Low: 77°F.
- Wednesday: Mostly sunny and hot. High: 99°F.
- Wednesday Night: Mostly clear. Low: 77°F.
- Thursday: Sunny and hot. High: 99°F.
- Friday: Mostly sunny. High: 99°F.
- Saturday: Mostly sunny. High: 97°F.
⚠️ Next Update: Watch for possible Heat Advisories through midweek if temperatures push past 100°F.
