Texas December Weather Today: San Antonio Fog, 65°F Start, and Midweek Cloud Build-Up

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Texas — Texas wakes beneath a hazy glow this morning as fog and mist soften the skyline across San Antonio, blurring headlights and leaving a damp sheen on pavement. Moist air presses close to the ground, creating a muted, gray start that feels more like late fall than the December cool-down many hoped for ahead of Christmas travel.

Conditions sit near 65°F, but a north wind is already pushing cooler air toward the city. Drivers along I-35 and Loop 410 should expect reduced visibility in lingering fog pockets, especially before mid-morning. Pavement may feel slick at intersections where mist settles more heavily. Residents heading out early should plan a few extra minutes for slower traffic flow.

By late morning, skies begin to brighten, yet temperatures fall toward the upper 40s by 9 a.m. as that cooler push strengthens. North winds increase to 15–20 mph, with gusts around 35 mph, giving the day a sharp, brisk feel despite the mild start. This marks a subtle winter tease, a reminder that bigger seasonal swings remain possible as December deepens.

Monday brings calmer conditions with highs near 56°F under partly sunny skies. Winds ease, making travel smoother for families preparing for school break and early-season outings. Tuesday trends cloudier, with highs around 63°F, as models show a thicker mid-level deck sliding across South Texas—nothing wintry, but enough to dim the warmth and slow afternoon warming.

Five-Day Outlook

Today: Fog early, breezy north wind, temps falling to near 49°F by morning.
Monday: Partly sunny, high 56°F.
Tuesday: Cloudy, high 63°F.
Wednesday: Mostly cloudy, high 74°F.
Thursday: Mostly sunny, high 80°F.