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

63°F

17°C

Humidity 100%
Wind Speed N 5 mph
Barometer 30.09 in
Dewpoint 63°F (17°C)
Visibility 6.00 mi
Last update 26 May 4:55 am EDT
Extended Forecast for

Downingtown PA

Dense Fog Advisory May 26, 05:02am until May 26, 08:00am
Click here for hazard details and duration
...
  •  
    Dense Fog Advisory May 26, 05:02am until May 26, 08:00am

    NOW until 8:00am Tue

    Dense Fog Advisory

  • Today

    High: 79 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Tonight

    Tonight: A chance of showers after 2am. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 62. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 62 °F

    Mostly Cloudy
    then Chance
    Showers and
    Patchy Fog

  • Wednesday

    Wednesday: Showers likely, mainly before 1pm. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 79. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 79 °F

    Showers
    Likely and
    Patchy Fog

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 60. West wind around 5 mph becoming calm.

    Low: 60 °F

    Mostly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 75. North wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 75 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 52.

    Low: 52 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 74.

    High: 74 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 52.

    Low: 52 °F

    Mostly Clear

Detailed Forecast

Today
Patchy fog before 7am. Otherwise, mostly cloudy, with a high near 79. Calm wind becoming south around 5 mph in the afternoon.
Tonight
A chance of showers after 2am. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 62. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
Showers likely, mainly before 1pm. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 79. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
Mostly cloudy, with a low around 60. West wind around 5 mph becoming calm.
Thursday
Sunny, with a high near 75. North wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday Night
Mostly clear, with a low around 52.
Friday
Sunny, with a high near 74.
Friday Night
Mostly clear, with a low around 52.
Saturday
Sunny, with a high near 71.
Saturday Night
Partly cloudy, with a low around 50.
Sunday
Mostly sunny, with a high near 71.
Sunday Night
Partly cloudy, with a low around 53.
Monday
Sunny, with a high near 73.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Downingtown PA
 39.99°N 75.67°W (Elev. 348 ft)
Last Update:
4:08 am EDT May 26, 2026
Forecast Valid:
5am EDT May 26, 2026-6pm EDT Jun 1, 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