Fiesta 2026 is headed into a stretch of weather San Antonio will notice fast: a cloudy morning, a push toward near 90 degrees this afternoon, and humidity thick enough to make it feel a few degrees hotter.
A stray storm along the Rio Grande cannot be ruled out, but any rain is expected to stay west of San Antonio. That leaves the city with heat, haze and the kind of unsettled forecast that can turn a planned day outside into a wait-and-see exercise. As one weather watcher put it: “Brace yourselves.”
The setup changes again by mid-morning to midday, when a cold front is expected to knock temperatures from the 70s into the low 60s. Late in the day, some sunshine is possible and should help temperatures climb back into the 70s, a sharp swing for people moving between Fiesta events and outdoor plans.
The forecast matters because Fiesta is not one event but a weather-sensitive stretch that runs through several days, and the next shift arrives Sunday night. A disturbance is expected to roll through then, bringing good chances for light rain and keeping cloudy, damp conditions in the low 60s for most of the day. The rain could wind down in time for the River Parade, but that event still carries the risk of cool, wet weather.
Justin Horne, a meteorologist and reporter for KSAT 12 News, and Shelby Ebertowski, who joined the station in January 2025 after coming to San Antonio from Fargo, North Dakota via the University of North Dakota, are covering the South Texas weather pattern as it develops. Their message to viewers is simple: “Don’t cancel your plans, but do be prepared to face various kinds of weather.”
That is the practical answer for Fiesta 2026. Warmth will be brief, the front will be noticeable, and the better rain chances appear to stay just west of San Antonio until Sunday night. For anyone heading to the River Parade or other outdoor events, the day is likely to be more about carrying layers and watching radar than counting on a stable forecast. One local cheer still fits the moment: “VIVA!🎉”