San Antonio, Texas – Sunshine is already taking over the San Antonio skyline, and the morning warmth won’t last long before intense afternoon heat settles across South Texas. Sidewalks, parking lots and roadways will heat quickly, creating another day where outdoor plans require extra caution.

According to the National Weather Service Austin/San Antonio, sunny skies will push temperatures to around 98 degrees this afternoon, while humidity raises the heat index to as high as 103 degrees. The heat continues to build through midweek, with highs reaching 99 degrees Tuesday and Wednesday, then 100 degrees Thursday and Friday. Tuesday’s heat index could peak near 105 degrees, making it feel even hotter than the actual air temperature.

Anyone spending extended time outdoors should stay hydrated, take frequent breaks in shaded or air-conditioned locations and avoid strenuous activity during the hottest part of the afternoon. Construction workers, landscapers, athletes and visitors exploring downtown San Antonio face the greatest risk for heat-related illness.

Travelers using I-35, I-10, Loop 410, Loop 1604 and U.S. 281 should prepare for intense heat during the afternoon commute. Keep extra water in your vehicle and check tire pressure before longer trips, as prolonged heat can increase stress on both vehicles and drivers. Never leave children or pets inside parked vehicles, where temperatures can become life-threatening within minutes.

The persistent heat is being driven by a broad area of high pressure anchored over the southern United States. Unlike parts of the Midwest and Great Lakes, South Texas is expected to remain dry through the middle of the week. No organized thunderstorms are expected locally, and tornado potential remains very low during this stretch of hot weather.

By Wednesday, afternoon highs remain near 99 degrees under mostly sunny skies. Temperatures climb to around 100 degrees Thursday and Friday, while warm nights in the upper 70s offer little cooling. Looking farther ahead, the 6-to-10-day outlook continues to favor above-normal temperatures, signaling that the summer heat is likely to persist into late next week.

Five-Day Forecast for San Antonio, Texas

• Today: Sunny. High 98°F. Heat index up to 103°F.
• Tuesday: Hot and mostly sunny. High 99°F. Heat index up to 105°F.
• Wednesday: Mostly sunny and hot. High 99°F.
• Thursday: Mostly sunny and hot. High 100°F.
• Friday: Mostly sunny and hot. High 100°F.