Honestly, if you're living in Vincennes, you've probably learned to never trust a clear sky in January. One minute it’s crisp and sunny, and the next, you’re digging your car out of a sudden dusting of lake-effect leftovers. Right now, on January 17, 2026, we’re staring down a forecast that’s a perfect example of why Indiana winters are so unpredictable.
Basically, the weather forecast for Vincennes Indiana is about to get a whole lot colder. While the high today managed to stay somewhat reasonable, the floor is about to drop out. If you’ve got outdoor plans for the next week, you might want to rethink them—or at least double-check your thermal layers.
The Immediate Outlook: A Chill is Settling In
It’s gonna be a bit of a roller coaster. Sunday, January 18, brings us a high of 27°F, but the real kicker is the low of 14°F at night. We’re looking at cloudy skies during the day with a light southwest wind around 14 mph. There’s a slim 10% chance of snow, which usually means just enough to make the sidewalks annoying but not enough for a snow day.
👉 See also: Why the Water Tower Farmers Market is Still the Best Weekend Bet
Then comes Monday. If you hate the cold, stay inside. The high is only hitting 17°F, and with a northwest wind kicking up to 18 mph, the wind chill is going to be brutal. It’ll be sunny, which is a nice lie from the atmosphere, but that 9°F low on Monday night is the real deal.
What the Next Few Days Look Like
- Tuesday, January 20: A slight "warm-up" to 32°F. It’ll be partly sunny with a 20% chance of some light snow during the day.
- Wednesday, January 21: This is the outlier. We hit 42°F. It’ll feel like spring for exactly five minutes before the clouds move back in.
- Thursday, January 22: Back to reality. Sunny but colder with a high of 36°F and a low of 27°F.
Why Vincennes Weather is So Moody
Most people think being in Southern Indiana means we dodge the worst of the "North" weather. Wrong. We’re in a weird pocket where we get the moisture from the south hitting the cold air masses from the plains.
Earlier this month, we saw that shift. On January 5-6, nearly a foot of snow dumped on parts of southern Indiana. We’ve even had weirdly late tornadoes in the region recently, like the EF-1 that hit Linton just back in December 2025. It’s that constant tug-of-war between warm and cold air that keeps the weather forecast for Vincennes Indiana so chaotic.
Humidity and Your Bones
In January, Vincennes usually sits at around 89% relative humidity. That’s why 30 degrees here feels way worse than 30 degrees in a dry place like Colorado. It’s a "wet cold." It gets into your clothes and stays there. Tomorrow, we’re looking at about 40% humidity, which is actually quite dry for us, but it’ll climb back up to 81% by next Monday.
👉 See also: Keys Soulcare It's Like Skin 2-in-1 Concealer Tint: Why I'm Finally Tossing My Heavy Foundations
Looking Ahead: The Late January Deep Freeze
If you think the mid-teens are bad, wait for the end of the month. By Tuesday, January 27, the forecast is calling for a high of only 11°F. The low? A staggering -6°F.
West winds will be light at 8 mph, but at those temperatures, it doesn’t take much to cause frostbite. This aligns with the long-range outlooks from the Old Farmer’s Almanac and local meteorologists who predicted this winter would be colder than our 30-year averages. We’re seeing a significant dip below the "normal" January high of 40°F.
Preparing for the -6°F Low
- Drip your faucets: Those old Vincennes homes have pipes that love to freeze when it hits the negatives.
- Check your tires: Pressure drops fast when it goes from 42°F on Wednesday to 11°F the following week.
- Pet safety: If it’s too cold for you to stand outside in a coat, it’s too cold for them.
The Actionable Bottom Line
The weather forecast for Vincennes Indiana shows a brief window of "mild" weather on Wednesday the 21st. Use that day. It’s your chance to run errands, check your roof for ice dams, or get the salt ready for your driveway.
After that, the temperature trend is a straight line down. We are moving into the heart of winter where the lows stay in the single digits or below zero. Keep your tanks half-full to prevent gas line freeze-up and stay tuned to local Knox County alerts, as these lake-effect systems can shift 20 miles and change a "dusting" into four inches of slush in a heartbeat.