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

Heat Wave and Severe Thunderstorms this Independence Day

A prolonged, dangerous heat wave will persist through the Independence Day weekend across the Ohio Valley, Midwest, and Mid-Atlantic. Numerous temperature records are expected. Clusters of severe thunderstorms will move across parts of the Allegheny Plateau into Mid Atlantic this Independence Day, with potential for widespread damaging winds. Additional severe thunderstorms in the Great Plains. Read More >

Hazardous Weather Conditions

Current conditions at

Johnstown - Cambria County Airport (KJST)

Lat: 40.31°NLon: 78.83°WElev: 2274ft.

A Few Clouds

67°F

19°C

Humidity 93%
Wind Speed Calm
Barometer 30.01 in (1014.3 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 5 Jul 3:54 am EDT
Extended Forecast for

3 Miles SE Portage PA

Dense Fog Advisory until July 5, 09:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory until July 5, 09:00am

    NOW until 9:00am Sun

    Dense Fog Advisory

  • Overnight

    Low: 65 °F

    Slight Chance
    Showers and
    Areas Dense
    Fog

  • Sunday

    Sunday: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 3pm. Some of the storms could produce heavy rainfall. Areas of dense fog before 9am. High near 78. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 78 °F

    Slight Chance
    T-storms and
    Areas Dense
    Fog then
    Heavy Rain

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm before midnight, then showers likely. Some of the storms could produce heavy rainfall. Low around 66. East wind 3 to 6 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 66 °F

    Heavy Rain

  • Monday

    Monday: A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 74. Southeast wind around 6 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    High: 74 °F

    Showers
    Likely

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm. Low around 64. East wind around 7 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 64 °F

    Showers

  • Tuesday

    Tuesday: Showers likely, then showers and possibly a thunderstorm after 11am. High near 73. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 73 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 11pm, then a chance of showers after 11pm. Low around 62. Chance of precipitation is 80%.

    Low: 62 °F

    Showers then
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 76. Chance of precipitation is 40%.

    High: 76 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Overnight
A slight chance of showers. Areas of dense fog. Otherwise, mostly cloudy, with a low around 65. West wind around 5 mph. Chance of precipitation is 20%.
Sunday
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 3pm. Some of the storms could produce heavy rainfall. Areas of dense fog before 9am. High near 78. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday Night
Showers and possibly a thunderstorm before midnight, then showers likely. Some of the storms could produce heavy rainfall. Low around 66. East wind 3 to 6 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Monday
A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 74. Southeast wind around 6 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Monday Night
Showers and possibly a thunderstorm. Low around 64. East wind around 7 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday
Showers likely, then showers and possibly a thunderstorm after 11am. High near 73. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 11pm, then a chance of showers after 11pm. Low around 62. Chance of precipitation is 80%.
Wednesday
A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 76. Chance of precipitation is 40%.
Wednesday Night
A chance of thunderstorms before 8pm. Partly cloudy, with a low around 64. Chance of precipitation is 30%.
Thursday
A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 78. Chance of precipitation is 50%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Chance of precipitation is 30%.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 76. Chance of precipitation is 70%.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 62. Chance of precipitation is 60%.
Saturday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 75. Chance of precipitation is 50%.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE Portage PA
 40.36°N 78.63°W (Elev. 2326 ft)
Last Update:
3:26 am EDT Jul 5, 2026
Forecast Valid:
4am EDT Jul 5, 2026-6pm EDT Jul 11, 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