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.

Fog/Mist

27°F

-3°C

Humidity 100%
Wind Speed Calm
Barometer 30.07 in
Dewpoint 27°F (-3°C)
Visibility 4.00 mi
Last update 17 Jan 11:55 pm EST
Extended Forecast for

3 Miles NNE Unionville PA

Winter Weather Advisory January 18, 06:00am until January 18, 08:00pm
Click here for hazard details and duration
Winter Weather Advisory

  • Overnight

    Overnight: A slight chance of snow before 4am, then a chance of rain between 4am and 5am, then a chance of rain and snow after 5am. Areas of dense fog before 1am. Otherwise, cloudy, with a low around 27. Calm wind. Chance of precipitation is 30%. Total nighttime snow accumulation of less than a half inch possible.

    Low: 27 °F

    Chance
    Rain/Snow and
    Areas Dense
    Fog

  • Sunday

    Sunday: Snow likely, mainly before 2pm. Cloudy, with a high near 33. Calm wind becoming northwest around 5 mph in the morning. Chance of precipitation is 60%. New snow accumulation of 1 to 3 inches possible.

    High: 33 °F

    Snow Likely

  • Sunday Night

    Sunday Night: A slight chance of snow before 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 17. West wind 5 to 10 mph. Chance of precipitation is 20%.

    Low: 17 °F

    Slight Chance
    Snow

  • M.L.King Day

    M.L.King Day: Sunny, with a high near 34. Southwest wind 5 to 15 mph, with gusts as high as 30 mph.

    High: 34 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 12. West wind around 10 mph, with gusts as high as 20 mph.

    Low: 12 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 22.

    High: 22 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 8.

    Low: 8 °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 24.

    Low: 24 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A slight chance of snow before 4am, then a chance of rain between 4am and 5am, then a chance of rain and snow after 5am. Areas of dense fog before 1am. Otherwise, cloudy, with a low around 27. Calm wind. Chance of precipitation is 30%. Total nighttime snow accumulation of less than a half inch possible.
Sunday
Snow likely, mainly before 2pm. Cloudy, with a high near 33. Calm wind becoming northwest around 5 mph in the morning. Chance of precipitation is 60%. New snow accumulation of 1 to 3 inches possible.
Sunday Night
A slight chance of snow before 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 17. West wind 5 to 10 mph. Chance of precipitation is 20%.
M.L.King Day
Sunny, with a high near 34. Southwest wind 5 to 15 mph, with gusts as high as 30 mph.
Monday Night
Partly cloudy, with a low around 12. West wind around 10 mph, with gusts as high as 20 mph.
Tuesday
Sunny, with a high near 22.
Tuesday Night
Mostly clear, with a low around 8.
Wednesday
Mostly sunny, with a high near 34.
Wednesday Night
Mostly cloudy, with a low around 24.
Thursday
Partly sunny, with a high near 37.
Thursday Night
Mostly clear, with a low around 17.
Friday
Mostly sunny, with a high near 31.
Friday Night
Partly cloudy, with a low around 21.
Saturday
Mostly sunny, with a high near 33.
Basemap Options
Click map to change the forecast location
Loading map...
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:
8:24 pm EST Jan 17, 2026
Forecast Valid:
12am EST Jan 18, 2026-6pm EST Jan 24, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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