San Antonio is starting Saturday, September 5, under mostly clear skies and warm, humid air, with temperatures around 80 degrees before sunrise. The city is headed for a mostly sunny afternoon near 98, and the heat index could reach 102. Rain chances remain low, so the bigger weekend story is familiar: summer refuses to leave quietly.
Saturday Brings Mostly Dry Heat
Clouds will thin into partly sunny skies as temperatures climb through the 80s and 90s. A south-southeast wind near 5 mph will do little to cut the humidity, while the chance of rain stays around 10% to 13% across San Antonio. No watches, warnings or advisories are listed for the area.
Sunday Offers A Small Shot At Storms
Sunday will be another hot one, with a high near 97 and heat-index values up to 105. A slight chance of showers and thunderstorms arrives after 1 p.m., with a 20% chance overall; any storms should be isolated rather than a broad washout. Overnight lows will remain near 78.
That is a modest update to the earlier Labor Day weekend outlook, with Sunday's storm chance now more clearly timed for the afternoon and weekend temperatures settling just below 100. Hoodline's Friday forecast had already pointed to a hot, mostly sunny stretch ahead.
Labor Day Keeps The Heat On
Labor Day Monday is forecast to be mostly sunny with a high near 98 and a low around 77 Monday night. Tuesday stays sunny and near 98, while Wednesday and Thursday ease only slightly into the mid-90s; Friday rebounds near 98. Slight afternoon storm chances return Wednesday, but most of the week looks largely dry in San Antonio.
Plan Around The Afternoon Peak
For outdoor plans, the most comfortable window will be earlier in the day, before temperatures and heat-index readings peak during the afternoon. Drink water, take breaks in shade or air conditioning, and check on people and pets who may struggle in the heat. The National Weather Service says the I-35 corridor is likely to stay mostly rain-free, while higher storm chances favor the Coastal Plains and Southern Edwards Plateau.
