Unseasonable Heat Wave: San Antonio Braces for Near-Record February Highs

Morning: A Muggy and Mild Start

San Antonio residents waking up this Wednesday, February 25, 2026, are greeted by an unusually warm and humid start to the day. Early morning temperatures hovered around 55°F with humidity levels peaking near 93%. While the air felt thick and muggy before sunrise, the clear skies served as a prelude to the rapid warming expected as the day progresses. The early morning calm is set to give way to a steady southwest wind that will play a major role in the day's dramatic temperature climb.

Afternoon: Chasing 90 Degrees

The headline for today is the significant heat spike hitting South Texas. Meteorologists are predicting high temperatures to reach between 88°F and 91°F, which is roughly 10 to 15 degrees warmer than Tuesday. If the mercury hits the 90-degree mark at the San Antonio International Airport, it would represent the first time the city has reached such a milestone in February since 2014. The afternoon will be characterized by partly sunny skies and a dry airmass moving in from the southwest, which will cause humidity to drop significantly to around 50% by mid-afternoon.

Evening: Clear Skies and Cooling Down

As the sun sets, the heat will dissipate fairly quickly thanks to the lower humidity levels. The evening forecast calls for clear skies with temperatures gradually retreating back into the 60s, eventually settling at a low of approximately 56°F overnight. It will be a pleasant night for outdoor activities, though the rapid cooling after such a hot day may be a stark contrast for those out late.

Alerts and Warnings: Fire Danger and Rain Chances

While there are no active rain warnings—with the chance of precipitation sitting at a negligible 0% to 10%—the primary concern for local officials is the increasing fire danger. The combination of gusty southwest winds and the influx of much drier air has heightened the risk of brush fires, particularly in areas west of the I-35 corridor. Residents are encouraged to avoid outdoor burning and exercise caution with potential ignition sources. Looking ahead, this warm trend is expected to continue into tomorrow before a weak cold front attempts to moderate temperatures by the weekend.