Texas starts the day under low clouds as mild December air hangs over San Antonio and Austin. Temperatures sit in the mid-40s, with damp pavement and reduced visibility already noticeable in spots. The air feels heavy, and drivers should expect changing conditions quickly.
Clouds dominate the morning. By late day, showers develop, mainly after dark, with a 30 percent chance of rain along the I-35 corridor. Patchy fog forms late, especially near rivers and low-lying roads. Commuters should plan extra time and watch for sudden visibility drops.
Wednesday keeps the unsettled theme going. Scattered showers and isolated thunderstorms remain possible early, then taper late morning. Highs climb to the upper 60s, and humidity lingers. While severe weather is not expected, brief downpours could create slick travel during peak hours.
By Wednesday night, clouds thin and conditions quiet. Lows stay mild near 62 degrees, setting the stage for a dramatic shift. Meteorologists are tracking strengthening ridging, which allows much warmer air to surge north.
Thursday delivers a December surprise. Sunshine returns, winds turn light, and highs soar near 79 degrees—more like late spring than winter. Outdoor plans benefit, but the warm-to-cool transition afterward deserves attention. Thursday night temperatures fall to the upper 40s, and lingering moisture could create fog again by early morning.
Friday stays bright and comfortable. Highs reach the upper 60s, ideal for travel and holiday errands. The weekend looks even warmer, with highs pushing upper 70s to near 80, reinforcing an unusual December warmth trend across South Central Texas.
What to do now: Expect wet roads tonight. Slow down in fog-prone areas. Prepare for rapid temperature swings later this week.
5-Day Outlook – San Antonio–Austin, TX
- Today: Cloudy, showers late, high near 61
- Wednesday: Showers early, high near 69
- Thursday: Mostly sunny, high near 79
- Friday: Sunny, high near 69
- Saturday: Mostly sunny, high near 78
