Honestly, if you're living in Plymouth, you already know the drill. You check the phone, see "cloudy," and think you're safe to run to the Piggly Wiggly in just a light fleece. Don't do it.
Right now, the Plymouth WI weather forecast is showing a deceptively calm 17°F. But here is the kicker: that west wind is humming at 12 mph, which drags the "feels like" temperature down to a biting 4°F. That is the difference between a brisk walk and your face going numb before you hit the car.
The Immediate Outlook: Snow and Shivers
If you’re looking at the rest of today, Saturday, January 17, 2026, we are topping out at 22°F. It’s going to stay cloudy, and there is about a 20% chance of snow during the day, bumping up to 25% tonight. It’s not a blizzard, but it's that fine, powdery Wisconsin dust that makes the roads just greasy enough to be annoying. Tonight the mercury drops to 11°F.
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Sunday is where things start to get kinda real. We are looking at a high of only 11°F with snow showers likely throughout the day. By the time you’re heading to bed Sunday night, it’ll be a crisp 2°F.
Why the "January Thaw" is a Myth This Year
A lot of locals talk about the mid-January thaw like it's a guaranteed holiday. Not in 2026. While some parts of the central plains are seeing warmer trends, Plymouth is caught in a classic squeeze. We have high humidity—currently sitting at 89%—which makes the cold feel "heavy." It’s that damp cold that gets into your joints.
According to data from the National Weather Service out of Milwaukee/Sullivan, we are entering a stretch where the Polar Vortex is wiggling just enough to send some Arctic surges our way.
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- Monday, Jan 19: Mostly sunny, but don't let the light fool you. The high is 2°F and the low is -6°F.
- Tuesday, Jan 20: A slight "warm-up" to 14°F, then right back down to -6°F at night.
- Mid-week (Jan 21-22): More snow showers and highs hovering in the low teens.
What You Actually Need to Do
Basically, the next 72 hours are about moisture management and wind protection. With a west wind being the dominant player this week, if your house faces west, check those window seals.
If you're heading out to the Kettle Moraine State Forest for some winter hiking or cross-country skiing, pay attention to that Sunday snow shower window. The visibility is expected to stay around 10 miles for now, but that can drop fast when the wind kicks up to that 14-16 mph range we're expecting by Monday.
Actionable Next Steps:
- Layers are non-negotiable: Since the humidity is high (hitting 99% by next Sunday), moisture-wicking base layers are better than just a heavy wool sweater.
- Vehicle Check: With lows hitting -6°F early next week, ensure your battery is up to snuff. This is the exact temperature range where older batteries tend to give up the ghost.
- Snow Strategy: We aren't seeing massive accumulation in the immediate 48-hour Plymouth WI weather forecast, but the 20-25% daily chances mean a constant dusting. Keep the salt or sand near the door now so you aren't chipping at ice on Monday morning.