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.

Overcast

24°F

-4°C

Humidity 89%
Wind Speed NW 10 mph
Barometer 29.89 in
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill14°F (-10°C)
Last update 18 Jan 7:35 pm EST
Extended Forecast for

3 Miles NNE Unionville PA

Winter Weather Advisory January 18, 07:56pm until January 18, 08:00pm
Click here for hazard details and duration
...
  •  
    Winter Weather Advisory January 18, 07:56pm until January 18, 08:00pm

    NOW until 8:00pm Sun

    Winter Weather Advisory

  • Tonight

    Low: 16 °F

    Slight Chance
    Snow then
    Mostly Clear

  • 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 12. West wind 10 to 15 mph.

    Low: 12 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 22. Wind chill values as low as zero. West wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 22 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 7. West wind around 5 mph becoming calm in the evening.

    Low: 7 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 39.

    High: 39 °F

    Partly Sunny

Detailed Forecast

Tonight
A slight chance of snow before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 16. Northwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
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 12. West wind 10 to 15 mph.
Tuesday
Sunny, with a high near 22. Wind chill values as low as zero. West wind 10 to 15 mph, with gusts as high as 30 mph.
Tuesday Night
Mostly clear, with a low around 7. West wind around 5 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 34.
Wednesday Night
Mostly cloudy, with a low around 27.
Thursday
Partly sunny, with a high near 39.
Thursday Night
Mostly clear, with a low around 16.
Friday
Mostly sunny, with a high near 30.
Friday Night
Partly cloudy, with a low around 18.
Saturday
A chance of snow. Partly sunny, with a high near 29. Chance of precipitation is 30%.
Saturday Night
A chance of snow. Mostly cloudy, with a low around 13. Chance of precipitation is 30%.
Sunday
A chance of snow. Partly sunny, with a high near 22. Chance of precipitation is 40%.
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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:
4:12 pm EST Jan 18, 2026
Forecast Valid:
7pm EST Jan 18, 2026-6pm EST Jan 25, 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