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

Briefing for Impacts from Hurricane Erin through Friday

Hurricane Erin is expected to bring several coastal and marine hazards to the coasts of New Jersey and Delaware through Friday. Widespread coastal flooding, high surf, high risk of rip currents, beach erosion, and dangerous marine conditions are forecast. View this briefing for details on these threats. Read More >

Current conditions at

Chester County Airport (KMQS)

Lat: 39.98°NLon: 75.87°WElev: 659ft.

Overcast

68°F

20°C

Humidity 100%
Wind Speed N 8 mph
Barometer 29.94 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 21 Aug 4:35 pm EDT
Extended Forecast for

3 Miles NNE Chatham PA

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 55. North wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 55 °F

    Decreasing
    Clouds

  • Friday

    Friday: Sunny, with a high near 80. North wind 5 to 10 mph.

    High: 80 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 57. Calm wind.

    Low: 57 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 81. Light southwest wind becoming south 5 to 10 mph in the morning.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 63. South wind around 5 mph.

    Low: 63 °F

    Mostly Clear

  • Sunday

    Sunday: A chance of showers, mainly after 2pm. Mostly cloudy, with a high near 81. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    High: 81 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Showers likely, mainly between 8pm and 2am. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.

    Low: 64 °F

    Showers
    Likely

  • Monday

    Monday: A chance of showers before 2pm. Partly sunny, with a high near 79. Chance of precipitation is 30%.

    High: 79 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming clear, with a low around 55. North wind 5 to 10 mph, with gusts as high as 20 mph.
Friday
Sunny, with a high near 80. North wind 5 to 10 mph.
Friday Night
Clear, with a low around 57. Calm wind.
Saturday
Sunny, with a high near 81. Light southwest wind becoming south 5 to 10 mph in the morning.
Saturday Night
Mostly clear, with a low around 63. South wind around 5 mph.
Sunday
A chance of showers, mainly after 2pm. Mostly cloudy, with a high near 81. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Sunday Night
Showers likely, mainly between 8pm and 2am. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Monday
A chance of showers before 2pm. Partly sunny, with a high near 79. Chance of precipitation is 30%.
Monday Night
Mostly clear, with a low around 57.
Tuesday
Mostly sunny, with a high near 75.
Tuesday Night
Mostly clear, with a low around 54.
Wednesday
Sunny, with a high near 74.
Wednesday Night
Mostly clear, with a low around 53.
Thursday
Sunny, with a high near 77.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNE Chatham PA
 39.87°N 75.81°W (Elev. 427 ft)
Last Update:
4:10 pm EDT Aug 21, 2025
Forecast Valid:
4pm EDT Aug 21, 2025-6pm EDT Aug 28, 2025
 
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