So, you're looking at the 30 day forecast san antonio tx and wondering if you should pack a parka or a polo. Honestly? If you’ve lived in South Texas for more than a week, you know the struggle. One day you’re sweating at a backyard BBQ, and the next, you’re scrambling to cover your sago palms because a "Blue Norther" just screamed through town.
It’s messy.
Right now, we are sitting in that weird pocket of January 2026 where the weather can't quite decide what it wants to be. We just came off a record-breaking start to the year—Jan 2 saw a high of 89°F. That’s not just "warm for winter"; it literally tied the all-time record for the hottest January day ever recorded in the Alamo City. But don't let that fool you into a false sense of security. The next few weeks are looking like a total rollercoaster.
The Immediate Outlook: Freezes and Fronts
If you’re checking the 30 day forecast san antonio tx for immediate travel plans, pay attention to the next 72 hours. A cold front is currently dropping south, and it’s bringing a reality check. We are looking at a widespread freeze for Sunday morning, Jan 18. We're talking lows in the 20s for most of San Antonio, and even the upper teens if you're out in the wind-protected valleys of the Hill Country near Boerne or Helotes.
It’s going to be a sharp contrast to those 70-degree afternoons we just had.
💡 You might also like: Lava Beds National Monument: What Most People Get Wrong About California's Volcanic Underworld
The National Weather Service has already flagged increasing fire weather concerns because the air behind this front is bone-dry. Dewpoints are hitting the single digits. That means static electricity everywhere and "crunchy" grass.
By Tuesday, Jan 20, the pattern shifts again. Moisture starts creeping back from the Gulf. We’re expecting rain chances to ramp up by mid-week, particularly on Wednesday, Jan 21. If you're commuting along the I-35 corridor toward Austin, expect about a quarter-inch of rain, but if you’re heading south toward the coastal plains, you might see up to an inch.
Why the Next 30 Days Look So Bipolar
Predicting weather in San Antonio isn't just about looking at a local radar; it’s about the massive Pacific patterns. We are currently in a "weak La Niña" phase.
What does that actually mean for your February plans?
📖 Related: Road Conditions I40 Tennessee: What You Need to Know Before Hitting the Asphalt
- Dryness is the default: Usually, La Niña pushes the jet stream north, leaving Texas high and dry.
- Temperature Spikes: Because there's less moisture in the air, the ground heats up faster. This is why we hit nearly 90 degrees in early January.
- The "Switch" is Coming: Climatologists at the Climate Prediction Center are watching for a transition to "ENSO-neutral" conditions. Basically, the Pacific is cooling off, and by late spring, we might even see an El Niño pattern that could finally break our multi-year drought.
For the remainder of January and the first half of February 2026, the 30 day forecast san antonio tx suggests we will stay slightly warmer than the historical average, but with high volatility. February is notoriously the month where San Antonio gets its nastiest cold snaps. Remember the 2021 freeze? No one is predicting a repeat of that catastrophe, but the "Almanac" outlook does warn of a very cold period hitting in the first week of February.
Planning for the San Antonio Stock Show & Rodeo
If you're coming for the Rodeo (which kicks off in early February), you need to be a layering pro. The Frost Bank Center will be hosting huge names like Miranda Lambert and Brad Paisley between Feb 12 and Feb 25.
Historically, this window is a toss-up.
The average high in February is around 69°F, while the average low is 45°F. However, the "real" San Antonio experience involves a 30-degree temperature swing in a single afternoon. You’ll start the morning in a heavy flannel and end it in a t-shirt.
👉 See also: Finding Alta West Virginia: Why This Greenbrier County Spot Keeps People Coming Back
Specifically, looking at the long-range trends for the second week of February 2026, we’re seeing a signal for "sunny and warm" conditions, which is great for the trail riders. But don't sleep on the final week of February—the forecast is already hinting at rainy periods and "chilly" transitions as we head into March.
Misconceptions About San Antonio "Winter"
A lot of people think South Texas doesn't have a winter. Tell that to the people who lost their power five years ago.
The biggest mistake you can make with the 30 day forecast san antonio tx is assuming "sunny" means "warm." In the winter, our clearest days are often our coldest because there are no clouds to trap the heat. If you see a forecast for 60 degrees and "clear skies," that 60 is going to feel much colder once the sun drops behind the horizon at 6:00 PM.
Also, rainfall in January and February is usually "light and grey." We don't get many of those massive summer thunderstorms. Instead, it’s a misty, 45-degree drizzle that makes the limestone roads as slick as ice. Texans aren't great at driving in the rain; they're even worse when it's cold rain.
Quick Actionable Advice for the Next 30 Days:
- Drip your pipes tonight: If the forecast shows a low of 28°F or below, don't risk it.
- Watch the "Dew Point": If it’s below 20, your skin is going to feel like sandpaper. Moisturize like it’s your job.
- Check the wind: A 55-degree day with a 20mph North wind feels like 40 degrees. In San Antonio, the wind is usually the "real" temperature.
- Cover the plants: Sago palms and citrus trees are San Antonio staples, but they hate these 20-degree flashes.
Final Reality Check
The 30 day forecast san antonio tx is a moving target. While the data points toward a warmer-than-average month overall, the short-term freezes are where the danger lies. Stay tuned to local meteorologists like Sarah Spivey or the NWS Austin/San Antonio office for the most granular updates as these fronts move through.
Next Steps for Your Planning:
- Check your tire pressure; the sudden cold drops will trigger your "low air" light.
- If you’re attending the MLK Day march, prep for cold morning temps (mid-30s) but a sunny, comfortable afternoon.
- Keep an eye on the Feb 1-6 window for the most significant "Arctic blast" potential of the season.