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

75°F

24°C

Humidity 69%
Wind Speed S 3 mph
Barometer 30.12 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 17 May 8:55 pm EDT
Extended Forecast for

Westtown PA

  • Tonight

    Tonight: Partly cloudy, with a low around 65. Southwest wind around 5 mph becoming calm after midnight.

    Low: 65 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, then gradually becoming sunny, with a high near 92. Light south wind becoming southwest 5 to 10 mph in the afternoon.

    High: 92 °F

    Becoming
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 68. South wind around 5 mph.

    Low: 68 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 70. Southwest wind 5 to 10 mph.

    Low: 70 °F

    Mostly Clear

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm after 2pm. High near 91. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 91 °F

    Sunny then
    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Low around 56. Chance of precipitation is 80%.

    Low: 56 °F

    Showers then
    Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 70.

    High: 70 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 65. Southwest wind around 5 mph becoming calm after midnight.
Monday
Partly sunny, then gradually becoming sunny, with a high near 92. Light south wind becoming southwest 5 to 10 mph in the afternoon.
Monday Night
Mostly clear, with a low around 68. South wind around 5 mph.
Tuesday
Sunny, with a high near 93. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 70. Southwest wind 5 to 10 mph.
Wednesday
Showers and possibly a thunderstorm after 2pm. High near 91. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Low around 56. Chance of precipitation is 80%.
Thursday
Partly sunny, with a high near 70.
Thursday Night
Mostly cloudy, with a low around 51.
Friday
A chance of showers after 8am. Mostly cloudy, with a high near 67. Chance of precipitation is 40%.
Friday Night
A chance of showers. Mostly cloudy, with a low around 51. Chance of precipitation is 50%.
Saturday
Showers likely. Mostly cloudy, with a high near 69. Chance of precipitation is 60%.
Saturday Night
Showers likely. Mostly cloudy, with a low around 55. Chance of precipitation is 60%.
Sunday
Showers likely. Mostly cloudy, with a high near 73. Chance of precipitation is 60%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Westtown PA
 39.94°N 75.57°W (Elev. 299 ft)
Last Update:
4:09 pm EDT May 17, 2026
Forecast Valid:
9pm EDT May 17, 2026-6pm EDT May 24, 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