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.

66°F

19°C

Humidity 98%
Wind Speed Vrbl 7 mph
Barometer 29.88 in
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 14 Oct 4:15 am EDT
Extended Forecast for

Downingtown PA

  • Today

    Today: A slight chance of showers after 10am. Increasing clouds, with a high near 81. West wind around 5 mph. Chance of precipitation is 20%.

    High: 81 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: Partly cloudy, with a low around 54. Northwest wind around 5 mph becoming north after midnight.

    Low: 54 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 67. North wind around 5 mph becoming east in the afternoon.

    High: 67 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Showers likely, mainly after 2am. Increasing clouds, with a low around 53. Southeast wind around 5 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 53 °F

    Chance
    Showers then
    Showers
    Likely

  • Friday

    Friday: Showers, mainly after 2pm. High near 76. Southwest wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 76 °F

    Showers

  • Friday Night

    Friday Night: Showers, mainly before 8pm. Low around 42. Breezy. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 42 °F

    Showers then
    Chance
    Showers and
    Breezy

  • Saturday

    Saturday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

  • Saturday Night

    Saturday Night: Patchy frost. Otherwise, mostly clear, with a low around 35.

    Low: 35 °F

    Patchy Frost

  • Sunday

    Sunday: Patchy frost before 9am. Otherwise, sunny, with a high near 59.

    High: 59 °F

    Patchy Frost
    then Sunny

Detailed Forecast

Today
A slight chance of showers after 10am. Increasing clouds, with a high near 81. West wind around 5 mph. Chance of precipitation is 20%.
Tonight
Partly cloudy, with a low around 54. Northwest wind around 5 mph becoming north after midnight.
Thursday
Mostly sunny, with a high near 67. North wind around 5 mph becoming east in the afternoon.
Thursday Night
Showers likely, mainly after 2am. Increasing clouds, with a low around 53. Southeast wind around 5 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Showers, mainly after 2pm. High near 76. Southwest wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
Showers, mainly before 8pm. Low around 42. Breezy. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Sunny, with a high near 52.
Saturday Night
Patchy frost. Otherwise, mostly clear, with a low around 35.
Sunday
Patchy frost before 9am. Otherwise, sunny, with a high near 59.
Sunday Night
Mostly clear, with a low around 38.
Monday
Sunny, with a high near 64.
Monday Night
Partly cloudy, with a low around 44.
Tuesday
Partly sunny, with a high near 67.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Downingtown PA
 40.02°N 75.7°W (Elev. 338 ft)
Last Update:
4:09 am EDT Oct 14, 2026
Forecast Valid:
4am EDT Oct 14, 2026-6pm EDT Oct 20, 2026
 
Forecast Discussion
 
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Additional Resources

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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