National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Chester County Airport (KMQS)

Lat: 39.98°NLon: 75.87°WElev: 659ft.

Light Snow Fog/Mist

31°F

-1°C

Humidity 100%
Wind Speed Calm
Barometer 30.03 in
Dewpoint 31°F (-1°C)
Visibility 2.00 mi
Last update 18 Jan 8:35 am EST
Extended Forecast for

3 Miles NNE Unionville PA

Winter Weather Advisory until January 18, 08:00pm
Click here for hazard details and duration
Winter Weather Advisory
  •  
    Winter Weather Advisory until January 18, 08:00pm

    NOW until 8:00pm Sun

    Winter Weather Advisory

  • Today

    High: 35 °F

    Snow then
    Chance Snow

  • Tonight

    Tonight: Cloudy during the early evening, then gradual clearing, with a low around 16. Northwest wind 5 to 10 mph.

    Low: 16 °F

    Gradual
    Clearing

  • M.L.King Day

    M.L.King Day: Mostly sunny, with a high near 34. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 34 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 10. West wind around 10 mph, with gusts as high as 20 mph.

    Low: 10 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 23. West wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 23 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 7.

    Low: 7 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 33.

    High: 33 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 25.

    Low: 25 °F

    Mostly Cloudy

Detailed Forecast

Today
Snow, mainly before 11am. High near 35. Light and variable wind becoming northwest 5 to 10 mph in the morning. Chance of precipitation is 80%. Total daytime snow accumulation of 2 to 4 inches possible.
Tonight
Cloudy during the early evening, then gradual clearing, with a low around 16. Northwest wind 5 to 10 mph.
M.L.King Day
Mostly sunny, with a high near 34. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 10. West wind around 10 mph, with gusts as high as 20 mph.
Tuesday
Sunny, with a high near 23. West wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly clear, with a low around 7.
Wednesday
Mostly sunny, with a high near 33.
Wednesday Night
Mostly cloudy, with a low around 25.
Thursday
Mostly sunny, with a high near 37.
Thursday Night
Mostly clear, with a low around 16.
Friday
Mostly sunny, with a high near 33.
Friday Night
Mostly cloudy, with a low around 24.
Saturday
A chance of rain and snow. Mostly cloudy, with a high near 36. Chance of precipitation is 30%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNE Unionville PA
 39.93°N 75.71°W (Elev. 295 ft)
Last Update:
4:11 am EST Jan 18, 2026
Forecast Valid:
8am EST Jan 18, 2026-6pm EST Jan 24, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation