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.

Fair

73°F

23°C

Humidity 55%
Wind Speed NW 7 mph
Barometer 30.06 in (1016.6 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 11 Sep 5:54 pm EDT
Extended Forecast for

Twin Rocks PA

  • Tonight

    Tonight: Increasing clouds, with a low around 61. Calm wind becoming southeast around 6 mph after midnight.

    Low: 61 °F

    Increasing
    Clouds

  • Saturday

    Saturday: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 76. South wind around 9 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 76 °F

    Chance
    Showers then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms between midnight and 2am, then a chance of showers after 2am. Low around 64. Southeast wind around 6 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 64 °F

    Showers then
    Chance
    Showers

  • Sunday

    Sunday: A chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Partly sunny, with a high near 77. West wind 5 to 8 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 77 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 57. Northwest wind around 6 mph. Chance of precipitation is 30%.

    Low: 57 °F

    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 69.

    High: 69 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 51.

    Low: 51 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 73.

    High: 73 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 59.

    Low: 59 °F

    Partly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 61. Calm wind becoming southeast around 6 mph after midnight.
Saturday
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 76. South wind around 9 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Showers and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms between midnight and 2am, then a chance of showers after 2am. Low around 64. Southeast wind around 6 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
A chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Partly sunny, with a high near 77. West wind 5 to 8 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 57. Northwest wind around 6 mph. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 69.
Monday Night
Mostly clear, with a low around 51.
Tuesday
Sunny, with a high near 73.
Tuesday Night
Partly cloudy, with a low around 59.
Wednesday
A chance of showers after 2pm. Mostly sunny, with a high near 80. Chance of precipitation is 30%.
Wednesday Night
A chance of showers. Partly cloudy, with a low around 64. Chance of precipitation is 30%.
Thursday
Showers likely. Partly sunny, with a high near 76. Chance of precipitation is 60%.
Thursday Night
Showers likely. Mostly cloudy, with a low around 58. Chance of precipitation is 60%.
Friday
A chance of showers. Mostly sunny, with a high near 73. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
Twin Rocks PA
 40.51°N 78.84°W (Elev. 2103 ft)
Last Update:
2:21 pm EDT Sep 11, 2026
Forecast Valid:
6pm EDT Sep 11, 2026-6pm EDT Sep 18, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation