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

Philadelphia - Wings Field Airport (KLOM)

Lat: 40.14°NLon: 75.27°WElev: 282ft.

Fair

81°F

27°C

Humidity 78%
Wind Speed Calm
Barometer 30.03 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 3 Jul 6:55 am EDT
Extended Forecast for

Norristown PA

Extreme Heat Warning July 3, 07:16am until July 4, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning July 3, 07:16am until July 4, 08:00pm

    NOW until 8:00pm Sat

    Extreme Heat Warning

  • Today

    High: 103 °F

    Hot

  • Tonight

    Tonight: Isolated showers and thunderstorms before midnight. Mostly clear, with a low around 79. Northwest wind around 5 mph. Chance of precipitation is 20%.

    Low: 79 °F

    Isolated
    T-storms then
    Mostly Clear

  • Independence Day

    Independence Day: Isolated showers and thunderstorms after 2pm. Increasing clouds and hot, with a high near 99. Heat index values as high as 105. Northwest wind 5 to 10 mph. Chance of precipitation is 20%.

    High: 99 °F

    Sunny then
    Isolated
    T-storms

  • Saturday Night

    Saturday Night: Scattered showers and thunderstorms. Mostly cloudy, with a low around 74. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 74 °F

    Scattered
    T-storms

  • Sunday

    Sunday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 90. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 90 °F

    Chance
    Showers then
    Showers
    Likely

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm. Low around 70. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

    Low: 70 °F

    Showers

  • Monday

    Monday: Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 83. Chance of precipitation is 70%.

    High: 83 °F

    Showers
    Likely then
    T-storms
    Likely

  • Monday Night

    Monday Night: Showers and thunderstorms likely before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then showers likely after 2am. Mostly cloudy, with a low around 67. Chance of precipitation is 70%.

    Low: 67 °F

    T-storms
    Likely then
    Showers
    Likely

Detailed Forecast

Today
Sunny and hot, with a high near 103. Heat index values as high as 111. Light west wind increasing to 5 to 10 mph in the morning.
Tonight
Isolated showers and thunderstorms before midnight. Mostly clear, with a low around 79. Northwest wind around 5 mph. Chance of precipitation is 20%.
Independence Day
Isolated showers and thunderstorms after 2pm. Increasing clouds and hot, with a high near 99. Heat index values as high as 105. Northwest wind 5 to 10 mph. Chance of precipitation is 20%.
Saturday Night
Scattered showers and thunderstorms. Mostly cloudy, with a low around 74. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 90. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Showers and possibly a thunderstorm. Low around 70. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Monday
Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 83. Chance of precipitation is 70%.
Monday Night
Showers and thunderstorms likely before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then showers likely after 2am. Mostly cloudy, with a low around 67. Chance of precipitation is 70%.
Tuesday
A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 83. Chance of precipitation is 40%.
Tuesday Night
A chance of thunderstorms before 8pm. Mostly cloudy, with a low around 67. Chance of precipitation is 30%.
Wednesday
Partly sunny, with a high near 87.
Wednesday Night
Partly cloudy, with a low around 68.
Thursday
Mostly sunny, with a high near 90.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Norristown PA
 40.13°N 75.33°W (Elev. 200 ft)
Last Update:
4:08 am EDT Jul 3, 2026
Forecast Valid:
7am EDT Jul 3, 2026-6pm EDT Jul 9, 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