San Antonio is starting Tuesday with partly cloudy skies, sticky air and another hot afternoon ahead. The high should reach 95 degrees, with peak heat-index readings closer to 105 degrees along I-35 and southeast winds at 5 to 15 mph, gusting to 25 mph. The rain chance stays small during the day, but the weather pattern is about to make a sharp turn.
Tuesday night stays warm, with a low around 76 and a 40% chance of showers after 1 a.m. Wednesday will push to 88, with heat index values above 100, a 40% chance of showers and thunderstorms. The National Weather Service says the most meaningful shift arrives Wednesday night, when storm chances increase.
Thursday And Friday Bring The Biggest Rain Concern
Thursday looks like the beginning of the soggy stretch, with rain and thunderstorms likely. Friday remains wet, with rain chances staying high and the possibility of heavy downpours.
The concern is not just getting wet. Forecasters are increasingly focused on flooding across the Hill Country and the I-35 corridor, with widespread rainfall totals of 2 to 4 inches possible Thursday into Friday and isolated amounts reaching 8 inches.
A Cooler, Wetter Weekend Follows
Showers and thunderstorms remain possible through the weekend, though temperatures should stay much lower than Tuesday’s heat. Saturday and Sunday are both forecast to top out near 82 degrees, with rain chances remaining in the forecast, while Monday brings highs in the mid-70s to lower 80s and rain chances remain in the forecast.
This is a substantial turn from the earlier Hoodline forecast, which called for only limited midweek rain. The latest outlook now points to a much broader storm threat and San Antonio’s first real break from the late-September heat.
Outdoor Plans Face A Split Forecast
Tuesday remains manageable for outdoor plans if you can handle the heat, but Wednesday afternoon will feel oppressive before storms become more widespread. By Thursday and Friday, residents should allow extra time for wet roads, avoid driving through flooded roadways and secure loose outdoor items before storms arrive.
