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.

Overcast

56°F

13°C

Humidity 100%
Wind Speed E 10 mph
Barometer 30.24 in
Dewpoint 56°F (13°C)
Visibility 9.00 mi
Last update 24 May 1:55 pm EDT
Extended Forecast for

Downingtown PA

  • This Afternoon

    This Afternoon: A chance of showers. Patchy fog before 5pm. Otherwise, cloudy, with a high near 62. Northeast wind around 5 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    High: 62 °F

    Chance
    Showers and
    Patchy Fog

  • Tonight

    Tonight: Showers, mainly after 10pm. Patchy fog after 11pm. Low around 57. Northeast wind around 5 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 57 °F

    Chance
    Showers and
    Patchy Fog
    then Showers
    and Patchy
    Fog

  • Memorial Day

    Memorial Day: Showers likely, with thunderstorms also possible after 2pm. Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 75. South wind around 5 mph becoming west in the afternoon. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 75 °F

    Showers
    Likely and
    Patchy Fog

  • Monday Night

    Monday Night: A chance of showers after 2am. Increasing clouds, with a low around 60. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 60 °F

    Mostly Cloudy
    then Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers before 2pm. Mostly cloudy, with a high near 76. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 76 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 61.

    Low: 61 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 79.

    High: 79 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 61.

    Low: 61 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 78.

    High: 78 °F

    Partly Sunny

Detailed Forecast

This Afternoon
A chance of showers. Patchy fog before 5pm. Otherwise, cloudy, with a high near 62. Northeast wind around 5 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Showers, mainly after 10pm. Patchy fog after 11pm. Low around 57. Northeast wind around 5 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Memorial Day
Showers likely, with thunderstorms also possible after 2pm. Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 75. South wind around 5 mph becoming west in the afternoon. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday Night
A chance of showers after 2am. Increasing clouds, with a low around 60. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
A chance of showers before 2pm. Mostly cloudy, with a high near 76. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night
Mostly cloudy, with a low around 61.
Wednesday
Mostly cloudy, with a high near 79.
Wednesday Night
Mostly cloudy, with a low around 61.
Thursday
Partly sunny, with a high near 78.
Thursday Night
Partly cloudy, with a low around 55.
Friday
Sunny, with a high near 73.
Friday Night
Partly cloudy, with a low around 52.
Saturday
Mostly sunny, with a high near 72.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Downingtown PA
 40°N 75.7°W (Elev. 299 ft)
Last Update:
7:52 am EDT May 24, 2026
Forecast Valid:
2pm EDT May 24, 2026-6pm EDT May 30, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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