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 NE 5 mph
Barometer 30.22 in
Dewpoint 56°F (13°C)
Visibility 7.00 mi
Last update 21 May 5:15 pm EDT
Extended Forecast for

Downingtown PA

  • This Afternoon

    This Afternoon: Showers. High near 60. Northeast wind around 5 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 60 °F

    Showers

  • Tonight

    Tonight: Showers likely, mainly before 10pm. Cloudy, with a low around 50. Northeast wind around 5 mph becoming calm. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 50 °F

    Showers
    Likely then
    Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 62. East wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 62 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A chance of showers before midnight, then rain likely, mainly after 2am. Cloudy, with a low around 45. East wind around 5 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 45 °F

    Chance
    Showers then
    Rain Likely

  • Saturday

    Saturday: Rain. High near 54. East wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 54 °F

    Rain

  • Saturday Night

    Saturday Night: Rain. Low around 47. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 47 °F

    Rain

  • Sunday

    Sunday: A chance of rain before 11am, then a chance of showers between 11am and 2pm. Mostly cloudy, with a high near 66. Chance of precipitation is 50%.

    High: 66 °F

    Chance Rain

  • Sunday Night

    Sunday Night: A chance of showers after 2am. Mostly cloudy, with a low around 54. Chance of precipitation is 30%.

    Low: 54 °F

    Mostly Cloudy
    then Chance
    Showers

  • Memorial Day

    Memorial Day: A chance of showers. Mostly cloudy, with a high near 69. Chance of precipitation is 40%.

    High: 69 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Showers. High near 60. Northeast wind around 5 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Showers likely, mainly before 10pm. Cloudy, with a low around 50. Northeast wind around 5 mph becoming calm. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Mostly cloudy, with a high near 62. East wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
A chance of showers before midnight, then rain likely, mainly after 2am. Cloudy, with a low around 45. East wind around 5 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
Rain. High near 54. East wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Saturday Night
Rain. Low around 47. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday
A chance of rain before 11am, then a chance of showers between 11am and 2pm. Mostly cloudy, with a high near 66. Chance of precipitation is 50%.
Sunday Night
A chance of showers after 2am. Mostly cloudy, with a low around 54. Chance of precipitation is 30%.
Memorial Day
A chance of showers. Mostly cloudy, with a high near 69. Chance of precipitation is 40%.
Monday Night
A chance of showers before 2am. Mostly cloudy, with a low around 57. Chance of precipitation is 30%.
Tuesday
Mostly cloudy, with a high near 77.
Tuesday Night
Mostly cloudy, with a low around 58.
Wednesday
Partly sunny, with a high near 80.
Wednesday Night
Mostly cloudy, with a low around 58.
Thursday
Mostly sunny, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Downingtown PA
 40.02°N 75.7°W (Elev. 338 ft)
Last Update:
4:08 pm EDT May 21, 2026
Forecast Valid:
5pm EDT May 21, 2026-6pm EDT May 28, 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