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.

Fair

48°F

9°C

Humidity 37%
Wind Speed Vrbl 5 mph
Barometer 29.98 in
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Wind Chill46°F (8°C)
Last update 13 Jan 12:35 pm EST
Extended Forecast for

Downingtown PA

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 47. South wind around 10 mph.

    High: 47 °F

    Mostly Sunny

  • Tonight

    Tonight: A slight chance of rain after 1am. Mostly cloudy, with a low around 37. Southwest wind 5 to 10 mph. Chance of precipitation is 20%.

    Low: 37 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday

    Wednesday: A chance of rain, mainly after 1pm. Mostly cloudy, with a high near 49. Southwest wind around 5 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    High: 49 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: Rain likely before 1am, then a chance of rain and snow between 1am and 4am, then a chance of snow after 4am. Cloudy, with a low around 24. Southwest wind 5 to 10 mph becoming west 10 to 15 mph after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 24 °F

    Rain Likely
    then
    Rain/Snow
    Likely

  • Thursday

    Thursday: Partly sunny, with a high near 29. West wind around 15 mph, with gusts as high as 35 mph.

    High: 29 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 15.

    Low: 15 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 30.

    High: 30 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 24.

    Low: 24 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 40.

    High: 40 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 47. South wind around 10 mph.
Tonight
A slight chance of rain after 1am. Mostly cloudy, with a low around 37. Southwest wind 5 to 10 mph. Chance of precipitation is 20%.
Wednesday
A chance of rain, mainly after 1pm. Mostly cloudy, with a high near 49. Southwest wind around 5 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
Rain likely before 1am, then a chance of rain and snow between 1am and 4am, then a chance of snow after 4am. Cloudy, with a low around 24. Southwest wind 5 to 10 mph becoming west 10 to 15 mph after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Thursday
Partly sunny, with a high near 29. West wind around 15 mph, with gusts as high as 35 mph.
Thursday Night
Partly cloudy, with a low around 15.
Friday
Mostly sunny, with a high near 30.
Friday Night
Partly cloudy, with a low around 24.
Saturday
Partly sunny, with a high near 40.
Saturday Night
Mostly cloudy, with a low around 22.
Sunday
Mostly sunny, with a high near 32.
Sunday Night
Partly cloudy, with a low around 16.
M.L.King Day
Mostly sunny, with a high near 29.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Downingtown PA
 40°N 75.7°W (Elev. 299 ft)
Last Update:
4:10 am EST Jan 13, 2026
Forecast Valid:
12pm EST Jan 13, 2026-6pm EST Jan 19, 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