Thinking about heading out around Preston tomorrow? Honestly, you’ve picked a pretty decent day for it, even if it is mid-January. If you were expecting a massive Idaho snow dump or a wind-chill that makes your face hurt, you might actually be a little surprised.
Basically, the weather tomorrow near Preston ID is looking surprisingly stable. We’re talking about a full day of sunshine on Saturday, January 17, 2026. After a week of varied conditions across the state, this little pocket of Franklin County is settling into a quiet rhythm.
What the numbers actually say
I'll get straight to the point. The high is hitting 33°F, which, let's be real, is just barely crossing that freezing mark. It’s that classic high-desert winter feel—crisp, but the sun actually does some work. When the sun goes down, it’ll drop to a low of 18°F.
It’s not "arctic blast" cold, but it’s definitely "keep the heater on" cold.
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The wind is almost a non-factor. We’re looking at a light breeze from the north at 4 mph. If you’ve ever stood out in a 20 mph gust in the Bear River Valley, you know how much of a blessing a 4 mph day is. It makes that 33-degree high actually feel like 33 degrees instead of a frozen nightmare.
Beyond the thermometer: The "feel" of the day
The humidity is hovering around 53%. In some parts of the country, that sounds low, but for us, it’s just enough to make the air feel "real" without being bone-dry. The UV index is a 1. Kinda goes without saying for January, but you won't be needing the SPF 50 unless you're spending hours staring at the snow glare up in the mountains.
Speaking of snow, the chance of precipitation is a flat 0%.
Zero. None.
Whether you’re looking at the daytime or the nighttime forecast, there’s no snow in the cards for tomorrow. It’s going to be a sunny day followed by a clear night.
Why this matters for your Saturday
If you're planning on running errands or maybe taking a drive out toward the reservoirs, you won't have to worry about slushy roads or sudden whiteouts. It’s a "dry cold" day.
- Morning (18°F - 24°F): Frozen windshield territory. Definitely give the car a few minutes to warm up.
- Mid-day (28°F - 33°F): This is the sweet spot. If you’re doing outdoor chores, this is when the sun will feel the warmest against the dark asphalt or dirt.
- Evening (Back down to the 20s): Once that sun dips behind the mountains, the temperature is going to plummet fast.
The Air Stagnation Factor
One thing locals should actually keep an eye on is the air quality. While the sky is clear and sunny, there has been an Air Stagnation Advisory in effect for the region, including Preston, until Sunday at noon.
When the air is this still (remember that 4 mph wind?), smoke and particulates tend to get trapped near the valley floor. If you have sensitive lungs or just hate that hazy "winter inversion" look, tomorrow might be a bit "soupy" in the lower elevations despite the blue sky above.
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Practical steps for tomorrow
Don't let the "sunny" description fool you into wearing a light hoodie. 33°F is still freezing.
- Layering is your friend: Heavy coat for the morning, but maybe something breathable if you're working outside in the afternoon sun.
- Check your tires: Even though it isn't snowing tomorrow, the low of 18°F means any lingering moisture from previous days will be solid ice in the morning.
- Enjoy the light: January can be pretty grey in Idaho. A full day of Vitamin D (even if it's cold Vitamin D) is worth taking advantage of.
Tomorrow is looking like a textbook quiet winter Saturday. No drama, no storms, just cold air and clear skies.