San Antonio woke up Tuesday, April 21, 2026, under a thick blanket of fog and low clouds, with muggy air, temperatures in the low 60s, and visibility trimmed to about 5 miles. That soupy start is expected to turn soggy, with showers and thunderstorms likely and a slow, slick afternoon and evening commute on tap.
Timing And Travel Impacts
Forecasters say the best chance for showers and thunderstorms runs from midday through the evening, with a high near 72°F and roughly a 70% chance of rain. Most spots are expected to pick up between a tenth and a quarter of an inch, although a few stronger cells could briefly dump heavier pockets of rain and trigger quick downpours, according to the NWS Austin/San Antonio.
Evening Into Wednesday
Rain chances should start to taper overnight, though a band of showers and a few thunderstorms could still linger before 7 p.m. Lows will hover near 67°F, with east-southeast winds around 5 to 10 mph. Low ceilings and patchy fog this morning have already cut visibility at times, so early commuters and general aviation should expect slower going. See yesterday’s look at local flood risk and travel disruptions for background on how this pattern has been affecting the city.
Warming Trend Later This Week
Most of the area should begin to dry out by Wednesday afternoon, with highs rebounding into the low 80s. The warmup continues into the mid-80s on Thursday and Friday. Another round of showers and thunderstorms is possible over the weekend, so residents with outdoor plans may want to keep a close eye on the forecast.
Local Tips
Plan on extra travel time, ease off the gas on wet roads, and never drive through standing water. If you live in low-lying neighborhoods, be ready to head to higher ground if water starts pooling around your home.
