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

34°F

1°C

Humidity 99%
Wind Speed Calm
Barometer 29.64 in
Dewpoint 33°F (1°C)
Visibility 2.00 mi
Last update 7 Jan 2:15 am EST
Extended Forecast for

2 Miles WSW Unionville PA

Dense Fog Advisory until January 7, 08:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory until January 7, 08:00am

    NOW until 8:00am Wed

    Dense Fog Advisory

  • Overnight

    Low: 35 °F

    Slight Chance
    Rain and
    Patchy Fog

  • Wednesday

    Wednesday: Partly sunny, with a high near 49. West wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 49 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 32. Northwest wind 5 to 10 mph.

    Low: 32 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 48. Northwest wind around 5 mph becoming calm in the afternoon.

    High: 48 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 36. Calm wind becoming south around 5 mph after midnight.

    Low: 36 °F

    Mostly Cloudy

  • Friday

    Friday: Showers likely, mainly after 1pm. Cloudy, with a high near 56. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 56 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Showers likely, mainly after 1am. Cloudy, with a low around 48. Chance of precipitation is 60%.

    Low: 48 °F

    Showers
    Likely

  • Saturday

    Saturday: Showers. High near 56. Chance of precipitation is 90%.

    High: 56 °F

    Showers

Detailed Forecast

Overnight
A slight chance of rain before 4am. Patchy fog. Otherwise, mostly cloudy, with a low around 35. West wind around 5 mph. Chance of precipitation is 20%.
Wednesday
Partly sunny, with a high near 49. West wind 10 to 15 mph, with gusts as high as 30 mph.
Wednesday Night
Partly cloudy, with a low around 32. Northwest wind 5 to 10 mph.
Thursday
Mostly sunny, with a high near 48. Northwest wind around 5 mph becoming calm in the afternoon.
Thursday Night
Mostly cloudy, with a low around 36. Calm wind becoming south around 5 mph after midnight.
Friday
Showers likely, mainly after 1pm. Cloudy, with a high near 56. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
Showers likely, mainly after 1am. Cloudy, with a low around 48. Chance of precipitation is 60%.
Saturday
Showers. High near 56. Chance of precipitation is 90%.
Saturday Night
Showers likely, mainly before 1am. Cloudy, with a low around 39. Chance of precipitation is 60%.
Sunday
A chance of showers before 1pm. Partly sunny, with a high near 47. Chance of precipitation is 30%.
Sunday Night
Partly cloudy, with a low around 28.
Monday
Sunny, with a high near 40.
Monday Night
Partly cloudy, with a low around 29.
Tuesday
Mostly sunny, with a high near 43.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WSW Unionville PA
 39.89°N 75.78°W (Elev. 449 ft)
Last Update:
12:23 am EST Jan 7, 2026
Forecast Valid:
2am EST Jan 7, 2026-6pm EST Jan 13, 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