San Antonio faces another hot Monday, with the high expected to reach 94 degrees and the heat index climbing as high as 101, according to the National Weather Service forecast. Rain is unlikely today, so the main weather story remains heat before a much wetter pattern takes over later this week.
Monday Stays Hot And Mostly Dry
Partly sunny skies should settle in by late morning, with east-southeast winds of 5 to 10 mph. The chance of rain is 10%, and no watches, warnings or advisories are active for the San Antonio area. Tonight will stay muggy and mostly cloudy, with a low near 77 and southeast winds gusting up to 20 mph.
Tuesday brings a small change, though not much of a cooldown. Some rain and storm chances are expected during the day. The high should reach 94, with heat index values near 100 and wind gusts up to 20 mph, according to the National Weather Service forecast.
Rain Chances Build Fast Midweek
The forecast turns noticeably more unsettled Wednesday, when the chance of precipitation is 40% during the day, with rain chances increasing late Wednesday and into Thursday. San Antonio could see rain before 1 p.m., with additional storms developing from the afternoon into the evening as moisture increases. The high is still expected to reach 95, but the heat will be sharing the stage with growing storm chances, according to the National Weather Service forecast.
The late-week shift has a larger-scale driver: an upper-level low is forecast to move from the Four Corners across the Plains, bringing a Pacific cold front toward South-Central Texas. Some guidance suggests precipitable water could be around 200% above normal, creating conditions for storms to produce very heavy rain. The National Weather Service’s latest discussion says rain chances rise Wednesday and continue late in the week.
Thursday could bring likely heavy rain, with showers and thunderstorms in the forecast, according to the National Weather Service forecast. Forecasters say heavy rainfall and flash flooding will become concerns Wednesday night into Thursday, which could create messy conditions for commutes and outdoor plans.
The timing and location of the heaviest rain remain uncertain. The front is expected to move slowly across the region from late Wednesday night through Friday, with heavier rain potentially reaching western parts of the area first and eastern areas Thursday. That means flood risk may vary across the region and could persist beyond a single round of storms. The NWS says models still differ on the front’s speed and how far it will advance.
Heavy rain can disrupt travel, and flooded roads may remain hazardous even after rainfall eases.
Cooler, Wetter Finish To The Week
Rain chances continue into the weekend, with temperatures in the 70s and 80s, according to the National Weather Service forecast.
Flood risk can vary across San Antonio, so drivers should be cautious around flooded roads.
That means San Antonio could go from a 94-degree Monday to temperatures in the 70s and 80s by the weekend. For now, outdoor plans are most comfortable early in the day, but anyone making plans for Wednesday night or Thursday should keep an eye on updated rainfall and flooding forecasts.
