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

Chester County Airport (KMQS)

Lat: 39.98°NLon: 75.87°WElev: 659ft.

Fog

43°F

6°C

Humidity 100%
Wind Speed Calm
Barometer 30.20 in
Dewpoint 43°F (6°C)
Visibility 0.50 mi
Last update 5 Mar 2:35 am EST
Extended Forecast for

Downingtown PA

  • Overnight

    Overnight: Rain, mainly after 4am. Widespread fog, mainly between 3am and 4am. Low around 42. Calm wind becoming east around 5 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 42 °F

    Rain and Fog

  • Thursday

    Thursday: Rain, mainly before 10am. Widespread fog, mainly after 4pm. High near 47. East wind 5 to 10 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 47 °F

    Rain and
    Areas Fog
    then Chance
    Rain and Fog

  • Thursday Night

    Thursday Night: Rain, mainly before 2am. Widespread fog before 1am, then patchy fog after 2am. Low around 38. Northeast wind 10 to 15 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 38 °F

    Rain and Fog

  • Friday

    Friday: Areas of fog before 10am. Otherwise, cloudy, with a high near 46. Northeast wind around 5 mph.

    High: 46 °F

    Areas Fog
    then Cloudy

  • Friday Night

    Friday Night: A chance of showers, mainly after 1am. Patchy fog after 1am. Otherwise, cloudy, with a low around 38. East 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: 38 °F

    Chance
    Showers and
    Patchy Fog

  • Saturday

    Saturday: A slight chance of showers after 1pm. Patchy fog before 10am. Otherwise, cloudy, with a high near 60. Chance of precipitation is 20%.

    High: 60 °F

    Patchy Fog
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: Showers likely, mainly before 1am. Mostly cloudy, with a low around 52. Chance of precipitation is 70%.

    Low: 52 °F

    Showers
    Likely

  • Sunday

    Sunday: Partly sunny, with a high near 64.

    High: 64 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy

Detailed Forecast

Overnight
Rain, mainly after 4am. Widespread fog, mainly between 3am and 4am. Low around 42. Calm wind becoming east around 5 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
Rain, mainly before 10am. Widespread fog, mainly after 4pm. High near 47. East wind 5 to 10 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
Rain, mainly before 2am. Widespread fog before 1am, then patchy fog after 2am. Low around 38. Northeast wind 10 to 15 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Friday
Areas of fog before 10am. Otherwise, cloudy, with a high near 46. Northeast wind around 5 mph.
Friday Night
A chance of showers, mainly after 1am. Patchy fog after 1am. Otherwise, cloudy, with a low around 38. East 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.
Saturday
A slight chance of showers after 1pm. Patchy fog before 10am. Otherwise, cloudy, with a high near 60. Chance of precipitation is 20%.
Saturday Night
Showers likely, mainly before 1am. Mostly cloudy, with a low around 52. Chance of precipitation is 70%.
Sunday
Partly sunny, with a high near 64.
Sunday Night
Partly cloudy, with a low around 44.
Monday
Sunny, with a high near 63.
Monday Night
Partly cloudy, with a low around 48.
Tuesday
Mostly sunny, with a high near 72.
Tuesday Night
Partly cloudy, with a low around 55.
Wednesday
A chance of showers. Mostly cloudy, with a high near 74. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
Downingtown PA
 39.99°N 75.67°W (Elev. 348 ft)
Last Update:
1:33 am EST Mar 5, 2026
Forecast Valid:
2am EST Mar 5, 2026-6pm EDT Mar 11, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation