San Antonio woke Thursday to cloudy skies and temperatures around 72 degrees, with showers and thunderstorms expected to bring locally heavy rain. The National Weather Service forecast a high near 78, with showers and thunderstorms expected to bring locally heavy rain.
The National Weather Service expects rain to continue into Friday. Its forecast places the heaviest totals west of San Antonio, across the Southern Edwards Plateau and western Hill Country; that regional outlook does not mean the same amounts are expected in the city. Heavier bursts could reduce visibility and make roads slick. The forecast information cited for the area listed no watches, warnings or advisories.
A record-setting storm is context, not a forecast
The scale of the current forecast is distinct from San Antonio’s rainfall record. The National Weather Service Austin/San Antonio says the city’s greatest calendar-day total was 11.26 inches at San Antonio International Airport on Oct. 17, 1998, during a separate historic flood event. That past record provides historical context; it is not evidence that this forecast will produce comparable rainfall or flooding.
A separate measure offers a broader, but limited, comparison: the National Weather Service’s San Antonio climate summary reports 1.19 inches of precipitation in October 2025, compared with an October normal of 3.75 inches. Those monthly figures do not establish a trend and do not describe Halloween-day conditions.
Checking conditions beyond the forecast
Rain can create localized road hazards even when a citywide forecast gives an estimated total. Bexar County’s road-closures map provides information on active and planned closures and actively flooded low-water crossings. Drivers should not drive through standing water and can check the map separately from the rainfall forecast.
Friday's forecast includes a 50% chance of showers and a high in the upper 70s. The outlook then calls for Saturday near 82 and Sunday near 85. Another chance of showers and thunderstorms is forecast Monday night into Tuesday. These are forecast conditions, not a guarantee of where or how much rain will fall.
