Honestly, if you're looking at a san antonio texas 30 day weather forecast and expecting a straight line, you've clearly never spent a winter in South Texas.
Right now, as we sit in mid-January 2026, the city is finally staring down its first real freeze. It's weirdly late this year. KENS 5 and other local experts have been tracking this "will-they-won't-they" relationship with the freezing mark for weeks, and it looks like Sunday, January 18th, is the day the streak finally breaks. We’re talking a low of 30°F.
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But that's the thing about San Antonio. One day you’re wrapping your pipes and covering the sago palms, and three days later you're wondering if it's too early to turn on the AC.
The Rollercoaster: January into February 2026
The next few weeks are basically a weather mood swing. Following that Sunday freeze, Monday the 19th bounces right back to a high of 66°F. It’s that classic "four seasons in a week" vibe that locals joke about, but it makes planning your life kinda difficult.
If you're looking at the long-range outlook for the rest of January, here is the gist:
The final week of January (around the 24th to the 31st) is trending colder again. We're expecting rainy periods, especially in the southern parts of Bexar County. It’s not going to be a "snowpocalypse," but it’ll be that damp, bone-chilling cold that feels way worse than the thermometer says because of the humidity.
February 2026 is looking a bit different. The Farmer's Almanac and NOAA long-range signals suggest February will actually be about 3°F warmer than average.
We might see a very cold snap right at the start of the month (Feb 1-6), but after that, it looks like a warm-up. If you're planning a Riverwalk stroll for Valentine's Day, the mid-month forecast (Feb 14-21) is calling for "showers and warm" conditions. Basically, bring an umbrella, but leave the heavy parka at home.
The Drought Factor Nobody Talks About
You can't talk about San Antonio weather without mentioning the drought. Sarah Spivey over at KSAT recently pointed out that Bexar County has been stuck in a drought for four straight years now.
That matters for your 30-day outlook because it affects how we feel the heat and how the "cold" behaves. Dry air heats up and cools down much faster than moist air.
- The La Niña Lingering: We’ve been stuck in a La Niña pattern that pushes the jet stream north, keeping us dry.
- The 2026 Flip: Meteorologists are watching for a shift to El Niño by the end of this year. While that's great for the Edwards Aquifer long-term, for your immediate 30-day forecast, it means we’re still fighting a rain deficit.
Expect a lot of "partly cloudy" days where it looks like it might rain, but the clouds just tease us and move on.
What to Actually Wear (The "Onion" Strategy)
If you’re visiting or just trying to survive the commute, stop trying to pick one outfit. It’s a fool’s errand. You have to layer like an onion.
In the morning, it might be 31°F (like it's predicted for early Sunday). You’ll need the beanie, the heavy coat, and maybe even gloves if you're scraping frost. By 2:00 PM, the sun hits that South Texas pavement and it’s 58°F or 60°F. If you’re still wearing that heavy coat, you’re going to be miserable.
I always tell people: a light hoodie under a windbreaker is the San Antonio "uniform" for January. You can ditch the windbreaker when the sun comes out and still be comfortable in the shade.
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Misconceptions About San Antonio "Winter"
People from up north laugh when we talk about a 30-degree night. But remember, our infrastructure isn't built for it. We don't have salt trucks on every corner.
Also, don't expect snow. Even though the "30 day" outlook shows some cold dips, the chance of actual measurable snow in San Antonio is nearly zero for 2026. We usually get "sleet" or "freezing rain," which is way more dangerous on I-10 than the fluffy white stuff.
Practical Steps for the Next 30 Days
Since we are officially hitting freeze territory, do the "4 P's" this weekend:
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- People: Check on elderly neighbors; their heaters might be struggling.
- Pets: Bring them inside. Even "outdoor" dogs aren't meant for a 30-degree night with a north wind.
- Plants: Cover the tropicals. If you have citrus or succulents, get the frost cloth out now.
- Pipes: Wrap those outdoor faucets. A $5 foam cover saves a $500 plumber bill.
Keep an eye on the humidity levels too. While the next few days are dry (around 13-30%), as we head into February, that humidity will climb back up to 60-70%. That’s when the "muggy" feeling returns, even in the 60s.
Check your local radar every morning before you leave the house—the 30-day forecast is a guide, but the San Antonio sky is the only thing that actually knows what it’s doing. Stay warm, or cool, or whatever the next hour requires.