San Antonio is waking up to a sticky start this Fourth of July, with mostly cloudy, muggy skies and temperatures hovering around 76°F. Humidity is already high, and the day is only getting warmer. By Saturday afternoon, July 4, 2026, expect mostly sunny skies, a high near 95°F, and heat-index readings climbing into the low 100s, so holiday plans will feel hotter than what the thermometer shows.
Afternoon Heat
Clouds will thin out through the day, letting in plenty of sun while light south-southeast breezes around 5 mph offer only minimal relief. Afternoon highs should top out near 95°F, with heat-index values commonly running about 100 to 107°F. Forecasters say a few hot spots could briefly hit 108°F. Any hopes for a cooling shower are slim, with essentially no measurable rain expected through Sunday, according to the National Weather Service.
Tonight And The Week Ahead
Once the sun goes down, the heat does not exactly call it a night. Lows tonight into Sunday morning will only dip to around 76 to 77°F, so late-night fireworks and backyard gatherings will stay steamy. Looking ahead, the workweek keeps the same theme, with afternoon highs in the mid to upper 90s and only isolated, low-probability storm chances on Monday and Tuesday. If you can, schedule outdoor work or workouts for the earlier morning hours, when it is at least somewhat less oppressive, and expect light south and southeast winds most days.
Heat Safety And Local Resources
For anyone without reliable air conditioning, the city maintains an interactive list of "places to stay cool" that includes libraries, pools, and community centers, and additional locations will open as needed. Call 311 for the latest list. You can also check the City of San Antonio for neighborhood options and hours. Drink plenty of water, avoid strenuous outdoor activity during the mid-afternoon peak, and make a point to check on older neighbors and pets.
