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

Johnstown - Cambria County Airport (KJST)

Lat: 40.31°NLon: 78.83°WElev: 2274ft.

Partly Cloudy

74°F

23°C

Humidity 88%
Wind Speed NW 10 mph
Barometer 29.96 in (1013.1 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 17 Aug 1:54 pm EDT
Extended Forecast for

Portage PA

  • This Afternoon

    This Afternoon: Showers and thunderstorms likely, mainly before 4pm. Mostly cloudy, with a high near 79. West wind around 9 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 79 °F

    Showers
    Likely

  • Tonight

    Tonight: Partly cloudy, with a low around 61. Northwest wind around 5 mph becoming calm in the evening.

    Low: 61 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 76. Calm wind becoming northwest 5 to 9 mph in the afternoon.

    High: 76 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 58. Light and variable wind.

    Low: 58 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 77. Light southwest wind becoming west 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 77 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A chance of showers. Mostly cloudy, with a low around 61. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 61 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 75. Chance of precipitation is 70%.

    High: 75 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 8pm. Mostly cloudy, with a low around 57. Chance of precipitation is 60%.

    Low: 57 °F

    Showers
    Likely then
    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 75.

    High: 75 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Showers and thunderstorms likely, mainly before 4pm. Mostly cloudy, with a high near 79. West wind around 9 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
Partly cloudy, with a low around 61. Northwest wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 76. Calm wind becoming northwest 5 to 9 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 58. Light and variable wind.
Wednesday
Mostly sunny, with a high near 77. Light southwest wind becoming west 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 61. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 75. Chance of precipitation is 70%.
Thursday Night
Showers likely and possibly a thunderstorm before 8pm. Mostly cloudy, with a low around 57. Chance of precipitation is 60%.
Friday
Mostly sunny, with a high near 75.
Friday Night
A chance of showers between 8pm and 2am. Partly cloudy, with a low around 60. Chance of precipitation is 30%.
Saturday
A chance of showers. Partly sunny, with a high near 76. Chance of precipitation is 50%.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 60. Chance of precipitation is 50%.
Sunday
A chance of showers. Partly sunny, with a high near 73. Chance of precipitation is 50%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Portage PA
 40.39°N 78.68°W (Elev. 1621 ft)
Last Update:
1:41 pm EDT Aug 17, 2026
Forecast Valid:
2pm EDT Aug 17, 2026-6pm EDT Aug 23, 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