If you’ve spent any time in Chester County lately, you’ve probably noticed that January is doing exactly what it loves to do—keeping us all guessing. One minute you're thinking about a light jacket for a quick run to the Borough, and the next, you're looking for the ice scraper that you definitely left in the trunk back in November. Honestly, the 10 day weather forecast for west chester pa is looking like a bit of a rollercoaster, and if you have plans for Martin Luther King Jr. Day or the following week, you might want to pay attention to the shift coming our way.
Right now, as of Saturday, January 17, 2026, we're sitting in a weirdly humid, mostly cloudy stretch. It’s about 35°F out there, but with the 7 mph southwest wind, it actually feels more like 29°F. We’ve got that classic Pennsylvania "winter damp" going on—humidity is at 84%.
The Immediate Outlook: Snow, Slush, and Messy Commutes
Today is basically a mix of everything. We’re looking at a high of 36°F with rain and snow likely throughout both the day and night. The chance of precipitation is hovering around 45%. It’s not a blizzard, but it’s that annoying kind of slush that makes the brick sidewalks in downtown West Chester a bit of a gamble.
Tomorrow, Sunday, January 18, things get a little more serious on the temperature front. While the high stays near 33°F with more snow expected (about a 45% chance during the day), the low is going to plummet. We're talking 17°F by tomorrow night. If you’ve got standing water or slush on your driveway, it’s going to turn into a sheet of ice by Monday morning.
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Basically, Sunday is your transition day. The wind is shifting to come from the North at 10 mph, which is usually the signal that the "mild-ish" winter days are taking a backseat for a while.
Looking Into Next Week: The Big Chill
Monday, January 19—Martin Luther King Jr. Day—is going to be a gorgeous but biting day. The sun will be out, but don't let those clear skies fool you. The high is only 33°F, and the overnight low is hitting 15°F.
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Then comes Tuesday.
Tuesday, January 20, is looking like the coldest day in this current 10 day weather forecast for west chester pa. We’re talking a high of only 22°F. It’s going to be sunny, which is great for the soul but less great for your heating bill. With a low of 12°F that night, you'll want to make sure your outdoor faucets are covered and your pets are cozy inside.
Mid-Week Fluctuations
Interestingly, we see a tiny bit of a rebound toward the middle of the week, but "warm" is a relative term here.
- Wednesday, Jan 21: High of 33°F, partly sunny, but another bone-chilling low of 12°F.
- Thursday, Jan 22: This is the outlier. We might actually hit 43°F. It’ll feel like a heatwave compared to Tuesday, though the 15 mph west wind will keep it brisk.
- Friday, Jan 23: Back down to 31°F for the high and 20°F for the low.
What to Expect Toward the End of the Month
As we head into the weekend of January 24 and 25, the pattern stays pretty consistent with typical Chester County winters. Saturday looks quiet with a high of 33°F and a low of 21°F.
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However, keep an eye on Sunday, January 25. The forecast is currently calling for snow with a high of only 20°F and a low of 11°F. If this holds, it’s going to be a legitimate winter day. Monday, January 26, continues the trend with snow showers and a high of 25°F.
Practical Steps for West Chester Residents
Since the temperatures are going to be swinging from the 40s down to the low teens, here’s the game plan. First, check your tire pressure. These 20-degree drops are notorious for triggering that annoying "low pressure" light on your dashboard. Second, if you’re walking the dog near the university or the parks, remember that the ground is going to be significantly colder than the air by mid-week—salt is your friend on those steps.
Lastly, with the humidity staying fairly high today (74%) but dropping significantly as the cold air moves in (down to 31% by next Saturday), expect some dry air issues. Now is the time to dig out the humidifier if you want to avoid waking up with a scratchy throat.
Stay warm, West Chester. It looks like winter has finally decided to actually show up.