San Antonio woke up Monday, June 29, 2026 to a warm, muggy start, with partly cloudy skies and temperatures already in the upper 70s. By midafternoon, highs are expected to jump into the mid 90s with a heat index near 100°F, and a thickening veil of haze is set to move in after about 1 p.m. If you have to be outside, aim for the cooler morning or evening hours and keep water close at hand.
Afternoon Heat And Haze
A plume of Saharan dust is sliding into South Central Texas, turning the sky a milky white and setting the stage for some dramatically tinted sunsets as tiny particles hang in the air. Haze should increase after 1 p.m. while south southeast winds run around 10 to 15 mph, with gusts up to 30 mph that can kick up more dust and make outdoor work or events feel even hotter than the thermometer suggests. This setup comes from guidance by the National Weather Service Austin/San Antonio, which is tracking the dust and heat through the day.
Heat Safety And Cooling Options
The City of San Antonio keeps an interactive hot weather resource and a list of cooling locations on hand, including libraries, senior centers and community centers that can offer a break from the afternoon blast. Call 311 to find nearby options. If you will be outdoors, try to avoid the peak heating window from roughly 2 to 7 p.m., drink water frequently, and check in on older neighbors, young children and pets who may struggle in this kind of heat. For maps and practical tips, visit the city hot weather page at City of San Antonio Hot Weather.
Week Outlook
The broader pattern looks stubborn. Dry, hot conditions are likely to hang on through the week, with daily highs mainly in the mid 90s to upper 90s and a few isolated spots flirting with 100°F, especially over the Rio Grande Plains and along and east of the I 35 corridor. Afternoon breezes should gradually ease after Tuesday, which will cut down on stronger gusts but also help keep overnight lows stuck in the mid 70s. If you are planning late week outdoor activities or getting a head start on Independence Day events, keep sunscreen handy and have a shaded or air conditioned backup plan ready.
