A Day of Two Seasons: Warm Winds Give Way to a Chilly Evening Plunge
Saturday Weather Overview
San Antonio residents can expect a weather rollercoaster this Saturday, February 21, 2026. While the day begins with unseasonably warm temperatures and plenty of sunshine, a potent cold front is scheduled to sweep through the Alamo City by midday, bringing sharp wind gusts and a significant temperature drop by nightfall.
Morning: Clouds Clearing and Winds Picking Up
The day starts with cool but comfortable temperatures in the upper 50s under partly cloudy skies. However, conditions will shift quickly as the morning progresses. By 10:00 a.m., northerly winds are expected to strengthen to approximately 15 mph, effectively pushing out the morning cloud cover and ushering in dry air. This transition will lead to mostly sunny skies by noon, setting the stage for a very warm afternoon.
Afternoon: Peak Heat and Red Flag Warning
Despite the arriving cold front, afternoon highs are projected to reach the mid-to-upper 70s, with some areas potentially touching 80 degrees. This warmth, combined with plummeting humidity levels near 20% and sustained northerly winds of 15 to 20 mph, has prompted the National Weather Service to issue a Red Flag Warning for the region. This warning is in effect from 10:00 a.m. to 9:00 p.m., indicating critical fire weather conditions. Residents are urged to avoid outdoor burning and exercise extreme caution with any equipment that could spark a fire.
- Temperature High: 74°F - 76°F
- Wind Gusts: Up to 30 mph
- Humidity: Dropping to 20%
- Precipitation: 0% chance during the day
Evening and Night: The Big Chill
The true impact of the cold front will be felt once the sun goes down. Temperatures are forecast to plunge rapidly during the evening hours, dropping from the 70s into the mid-40s by late night. The gusty northerly winds will persist, making the air feel significantly colder. By early Sunday morning, wind chill values may dip into the 30s, making it the coldest night the city has seen in over two weeks. If you are heading out for Saturday night plans, a heavy jacket is highly recommended.
Community Note
For those interested in weather safety, the National Weather Service is conducting free FloodAware and Skywarn training classes today from 8:30 a.m. to 12:00 p.m. at Trinity University. These sessions are open to the public and offer valuable information on reporting severe weather hazards.