Texas starts the morning under gray skies and a cool edge as winter briefly reminds South Central Texas it’s still December. Damp pavement glistens under streetlights, and temperatures sit near 42 degrees around San Antonio and Austin before sunrise. A light breeze adds a chill, especially on elevated roadways and open bridges.
This early cold snap fades quickly. Clouds thin through the morning, allowing temperatures to rebound into the mid-50s by afternoon. Roads remain mostly dry, but drivers should stay alert for slick spots where moisture lingered before sunrise. Jackets will be needed early, but not for long.
Warmer air pushes in Tuesday, and the transition becomes noticeable. Skies turn mostly cloudy, highs climb into the low 60s, and humidity begins to increase. Travel conditions stay favorable across I-35, though thicker cloud cover may limit visibility at times.
By Wednesday, December warmth takes center stage. Temperatures surge into the low 70s, and a slight chance of showers develops, mainly before midday. Any rain remains light, but changing conditions could impact morning commutes. Keep umbrellas handy and allow extra travel time if showers develop.
Thursday delivers the biggest shift. Sunshine returns, and highs soar near 80 degrees, an almost springlike feel for mid-December. The warmth arrives fast, signaling a classic Texas temperature swing. After sunset, clearer skies allow temperatures to cool again, though freezing is not expected.
Looking ahead to the weekend, mild conditions hold. Highs stay in the upper 70s, perfect for outdoor errands, holiday decorating, or early Christmas travel plans. While no winter weather threats are on the immediate horizon, rapid changes remain possible this time of year.
Five-Day Outlook for San Antonio–Austin, TX
• Today: Partly sunny, cool morning, high near 56°F
• Tuesday: Cloudy and mild, high near 61°F
• Wednesday: Slight shower chance, high near 71°F
• Thursday: Mostly sunny and warm, high near 80°F
• Friday: Sunny and mild, high near 71°F
