Alamo City Shivers Through Frosty Morning Before a Golden Afternoon Rebound

San Antonio Wakes to Coldest Morning of the Week Before a Sunny Rebound

Residents across the Alamo City will need to reach for their heavy coats this Monday, February 23, 2026, as San Antonio experiences its most significant chill of the week. Following a clear night, temperatures have plummeted, marking a frosty start to the work week. However, the biting cold will be short-lived as bright South Texas sunshine is set to take over by midday.

Chilly Morning Commute

The early hours of Monday represent the coldest point of the week for the region. Meteorologists report that temperatures in the heart of San Antonio are expected to bottom out between 36 and 38 degrees Fahrenheit around 7:00 AM. Those commuting from the surrounding Hill Country should be even more cautious, as neighboring areas like Fredericksburg and Kerrville are expected to see temperatures dip slightly below the freezing mark. Dry air and clear skies have allowed for maximum cooling overnight, making wind-resistant layers essential for early outdoor activities.

• 7:00 AM: 37°F — Coldest point of the day with clear skies.
• 10:00 AM: 52°F — Rapid warming begins under direct sun.
• 12:00 PM: 60°F — Pleasant midday conditions with low humidity.

A Sunny Afternoon Thaw

Despite the shivering start, the afternoon promises beautiful conditions for San Antonians. High pressure and abundant sunshine will allow temperatures to rise steadily. By 3:00 PM, the city is forecast to reach a high of 66 to 67 degrees Fahrenheit. While this remains a few degrees below the climate average of 69 degrees for late February, the lack of significant wind and cloud cover will make it feel remarkably mild and comfortable for a walk at the River Walk or local parks.

Humidity levels will remain very low, hovering around 27% during the peak of the day. This dry air continues a concerning trend for South Central Texas, as no rain is in the forecast. Local authorities noted that the lack of precipitation is likely to worsen ongoing drought conditions in the coming days.

Evening Outlook and the Week Ahead

As the sun sets around 6:33 PM, the air will lose its warmth quickly. Evening temperatures will slide back into the 50s during the twilight hours and eventually settle into a low of approximately 41 to 42 degrees overnight. The sky is expected to remain clear, providing excellent visibility for the late-night hours.

• 6:33 PM: Sunset — Temperatures beginning to drop sharply.
• 9:00 PM: 50°F — Clear and cool conditions.
• Overnight Low: 42°F — One last chilly night before a major warm-up.

Looking ahead, today marks the start of a dramatic temperature swing. While today requires a jacket, a shift in wind direction by Tuesday will usher in much warmer air from the south, with highs expected to climb into the 70s and potentially the mid-80s by Wednesday.