Monday, April 27, 2026, greeted San Antonio with hazy, muggy skies, temperatures in the mid-70s, and dew points in the low-70s that made the air feel thick before breakfast. The warmup will be fast: highs are headed for the mid-90s, and afternoon heat-index values are expected to jump into the low 100s, so anything outdoors around midday will feel hotter than what the thermometer shows.
Hot Through Midweek
The latest forecast calls for highs near 94 on Monday, April 27, and around 95 on Tuesday, April 28, with heat-index values in the 100 to 105 range across parts of the metro and the I-35 corridor. According to NWS Austin/San Antonio, humidity will stay stubbornly high at night, with lows mainly in the 70s. That combo will keep things sticky for sleeping and tough on anyone who has to work outdoors early.
Midweek Showers Could Bring Relief
A cold front is expected to slide into North Texas on Wednesday, April 29, then stall across the region, which will boost chances for showers and thunderstorms from Wednesday, April 29, through Friday, May 1. The forecast discussion highlights late Thursday night, April 30, into Friday, May 1, as the most likely window for more organized rain. Any storms that manage to develop could be on the strong side and drop locally heavy downpours.
Heat Safety And Cooling Options
The San Antonio Metropolitan Health District has issued a Level II heat advisory, a designation that signals a sustained heat-index of 105°F or higher and overnight lows that may not dip below 80°F for two straight nights. According to Metro Health, residents are urged to spend time in air-conditioned places such as libraries and community centers, check on neighbors and vulnerable family members, and call 3-1-1 or 2-1-1 for assistance or fan programs.
What To Change In Your Plans
Try to shift strenuous outdoor work or workouts to early morning or later in the evening, carry water, and build in extra breaks for outdoor crews. Never leave children or pets in parked cars, even for a quick stop. Commuters should plan for a mid-afternoon heat spike and expect walking or biking trips to take longer during the hottest part of the day.
For more on how this pattern set up, see our earlier piece on how San Antonio turns into steam room from April 26, 2026. We will post updates if NWS or Metro Health issues any new watches, warnings, or expanded cooling-center activations.
