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

Heavy to Excessive Rainfall This Week from the Southwest into Central U.S.

Pacific tropical moisture wrapping into a storm over the southwest U.S. will continue a multi-day heavy rainfall event this week that will extend into the Midwest and southern Plains. Considerable flash flooding is possible across portions of New Mexico and west Texas today through Wednesday. Read More >

Current conditions at

Chester County Airport (KMQS)

Lat: 39.98°NLon: 75.87°WElev: 659ft.

Fair

59°F

15°C

Humidity 100%
Wind Speed Calm
Barometer 30.02 in
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 29 Sep 7:55 am EDT
Extended Forecast for

Downingtown PA

  • Today

    Today: Partly sunny, with a high near 73. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 73 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 56. Calm wind.

    Low: 56 °F

    Mostly Clear

  • Wednesday

    Wednesday: Patchy fog between 7am and 8am. Otherwise, mostly sunny, with a high near 77. Calm wind becoming west around 5 mph.

    High: 77 °F

    Patchy Fog
    then Partly
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 60. Calm wind.

    Low: 60 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 80. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 80 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 62.

    Low: 62 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 60.

    Low: 60 °F

    Mostly Cloudy

  • Saturday

    Saturday: A chance of showers after 2pm. Mostly cloudy, with a high near 71. Chance of precipitation is 30%.

    High: 71 °F

    Partly Sunny
    then Chance
    Showers

Detailed Forecast

Today
Partly sunny, with a high near 73. Calm wind becoming northwest around 5 mph in the afternoon.
Tonight
Mostly clear, with a low around 56. Calm wind.
Wednesday
Patchy fog between 7am and 8am. Otherwise, mostly sunny, with a high near 77. Calm wind becoming west around 5 mph.
Wednesday Night
Mostly cloudy, with a low around 60. Calm wind.
Thursday
Mostly sunny, with a high near 80. Calm wind becoming southwest around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 62.
Friday
Mostly sunny, with a high near 82.
Friday Night
Mostly cloudy, with a low around 60.
Saturday
A chance of showers after 2pm. Mostly cloudy, with a high near 71. Chance of precipitation is 30%.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 55. Chance of precipitation is 50%.
Sunday
Showers likely. Cloudy, with a high near 67. Chance of precipitation is 60%.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 52. Chance of precipitation is 40%.
Monday
Partly sunny, with a high near 66.
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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 Sep 29, 2026
Forecast Valid:
8am EDT Sep 29, 2026-6pm EDT Oct 5, 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