Honestly, if you've lived in the Alamo City for more than a week, you know the drill. One day you’re wearing flip-flops at a Backyard on Broadway, and the next, you’re scouring the garage for that one heavy coat you bought for a trip to Colorado three years ago.
Weather for tomorrow in San Antonio is basically a masterclass in South Texas mood swings.
We’re looking at a Sunday, January 18, that starts with a literal slap to the face from a cold front before turning into a gorgeous, crisp winter afternoon. If you’re planning on hitting the Pearl Farmers Market or grabbing breakfast tacos early, you’re going to need to be strategic.
The Big Chill: Sunday Morning Reality Check
Let’s talk numbers because they're a bit startling. The low is hitting 29°F.
That is a hard freeze.
The National Weather Service has already slapped a Freeze Warning on the area, effective from 2:00 AM until 9:00 AM. If you haven't wrapped your pipes or moved your potted succulents inside yet, tonight is the night. We’ve been spoiled with a relatively warm start to the year, but the "4 P’s"—people, pets, plants, and pipes—need your attention right now.
The humidity is going to be incredibly low, hovering around 27%. This means it’s that "dry cold" that bites at your skin.
Highs, Lows, and Everything in Between
By the time the sun is fully up, things start to look a lot better. We’re expecting a high of 60°F.
That’s a 31-degree swing in a single day.
- Condition: Sunny and bright. Not a cloud in sight.
- Wind: Blowing from the west at about 9 mph. It’s enough to keep the air moving but shouldn't be knocking over your patio furniture.
- Precipitation: 0%. Absolutely none. Your car wash is safe for at least 24 hours.
It’s the kind of day where you leave the house in a parka and end up carrying it like a heavy, nylon burden by 2:00 PM.
Why This Freeze Matters for San Antonio
We’ve been stuck in a drought since 2022. While a freeze doesn't help the Edwards Aquifer levels, it does signal the peak of our "cool season," which usually wraps up by late February.
Historically, January is our driest and coldest month. The average high is usually around 64°F, so tomorrow’s 60°F is actually slightly below the norm.
If you're wondering about the long-term outlook, local experts at KSAT are keeping a close eye on the shift from La Niña to El Niño. For now, we're still in that dry, crisp pattern. This means no "winter mix" or sleet for this specific front—just pure, unadulterated sunshine and shivering mornings.
Survival Tips for a 30-Degree Swing
Don't be the person who gets caught off guard.
First off, dress in layers. A base layer, a sweater, and then a wind-resistant shell. You’ll be peeling them off like an onion as the clock hits noon.
Second, check on your neighbors. The city is opening warming centers, like the one at Travis Park Church, starting at 8:00 AM Sunday. If you know someone who might struggle with a sub-freezing morning, give them a shout.
Finally, do not forget the car hood tap. Cats love to crawl into warm engine bays when the temps drop below freezing. A quick knock on the hood before you start the ignition can save a life.
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Tomorrow is going to be a beautiful day once we get past the initial frostbite. Grab a coffee, enjoy the zero-percent chance of rain, and maybe keep an extra blanket in the trunk just in case.
Actionable Steps for Sunday:
- Before Bed Tonight: Wrap outdoor faucets and bring in sensitive plants.
- 7:00 AM: Expect frost on windshields; give yourself an extra 10 minutes for defrosting.
- 11:00 AM: Transition to lighter layers as the sun begins to warm the pavement.
- 9:00 PM: Keep an eye on Monday’s forecast, as clouds start rolling back in for MLK Day.