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

Dangerous Heat and Humidity Through Saturday

Dangerously hot and humid conditions are expected to continue through Saturday. Additionally, there will be a threat of thunderstorms through Sunday. View this briefing for details. Read More >

Hazardous Weather Conditions

Current conditions at

Chester County Airport (KMQS)

Lat: 39.98°NLon: 75.87°WElev: 659ft.

Partly Cloudy

94°F

34°C

Humidity 48%
Wind Speed W 7 mph
Barometer 29.96 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index102°F (39°C)
Last update 3 Jul 5:35 pm EDT
Extended Forecast for

Atglen PA

Severe T-storm Watch until July 3, 11:00pm
Extreme Heat Warning July 3, 05:57pm until July 4, 08:00pm
Click here for hazard details and duration
Severe T-storm Watch
Extreme Heat Warning
  •  
    Severe T-storm Watch until July 3, 11:00pm
    Extreme Heat Warning July 3, 05:57pm until July 4, 08:00pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • This Afternoon

    High: 100 °F

    Severe
    Thunderstorms

  • Tonight

    Tonight: A chance of showers and thunderstorms, mainly before 8pm. Some of the storms could be severe. Partly cloudy, with a low around 75. West wind around 5 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 75 °F

    Severe
    Thunderstorms
    then Partly
    Cloudy

  • Independence Day

    Independence Day: A chance of showers and thunderstorms, mainly after 4pm. Mostly sunny, with a high near 96. Heat index values as high as 101. Northwest wind 5 to 10 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 96 °F

    Sunny then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: Showers and thunderstorms likely before midnight, then showers likely and possibly a thunderstorm between midnight and 1am. Mostly cloudy, with a low around 72. West wind around 5 mph becoming calm. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 72 °F

    Showers
    Likely

  • Sunday

    Sunday: Showers and possibly a thunderstorm after 2pm. High near 88. Northeast wind around 5 mph becoming southeast in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 88 °F

    Mostly Cloudy
    then Showers

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm before 5am, then showers likely. Low around 69. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

    Low: 69 °F

    Showers

  • Monday

    Monday: Showers likely, then showers and possibly a thunderstorm after 2pm. High near 78. Chance of precipitation is 80%.

    High: 78 °F

    Showers
    Likely then
    T-storms

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 66. Chance of precipitation is 80%.

    Low: 66 °F

    T-storms then
    Showers

Detailed Forecast

This Afternoon
A slight chance of showers and thunderstorms. Some of the storms could be severe. Mostly sunny and hot, with a high near 100. Heat index values as high as 105. West wind around 15 mph. Chance of precipitation is 20%.
Tonight
A chance of showers and thunderstorms, mainly before 8pm. Some of the storms could be severe. Partly cloudy, with a low around 75. West wind around 5 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Independence Day
A chance of showers and thunderstorms, mainly after 4pm. Mostly sunny, with a high near 96. Heat index values as high as 101. Northwest wind 5 to 10 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Showers and thunderstorms likely before midnight, then showers likely and possibly a thunderstorm between midnight and 1am. Mostly cloudy, with a low around 72. West wind around 5 mph becoming calm. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
Showers and possibly a thunderstorm after 2pm. High near 88. Northeast wind around 5 mph becoming southeast in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Showers and possibly a thunderstorm before 5am, then showers likely. Low around 69. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Monday
Showers likely, then showers and possibly a thunderstorm after 2pm. High near 78. Chance of precipitation is 80%.
Monday Night
Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 66. Chance of precipitation is 80%.
Tuesday
A chance of showers before 8am, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 80. Chance of precipitation is 50%.
Tuesday Night
A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 65. Chance of precipitation is 40%.
Wednesday
A chance of showers. Partly sunny, with a high near 81. Chance of precipitation is 30%.
Wednesday Night
A chance of showers. Partly cloudy, with a low around 66. Chance of precipitation is 30%.
Thursday
A chance of showers. Mostly sunny, with a high near 86. Chance of precipitation is 30%.
Thursday Night
A chance of showers. Partly cloudy, with a low around 68. Chance of precipitation is 30%.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Atglen PA
 39.94°N 75.97°W (Elev. 577 ft)
Last Update:
4:08 pm EDT Jul 3, 2026
Forecast Valid:
5pm EDT Jul 3, 2026-6pm EDT Jul 10, 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