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

69°F

21°C

Humidity 90%
Wind Speed S 6 mph
Barometer 30.17 in (1019.9 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 12 Aug 1:54 am EDT
Extended Forecast for

Twin Rocks PA

  • Overnight

    Overnight: Mostly clear, with a low around 66. Light south wind.

    Low: 66 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 86. Calm wind becoming south around 5 mph in the afternoon.

    High: 86 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 68. Calm wind. Chance of precipitation is 20%.

    Low: 68 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Wednesday

    Wednesday: Showers and thunderstorms. High near 81. West wind 3 to 6 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 81 °F

    T-storms

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms before 2am, then a slight chance of showers. Low around 67. Light west wind. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 67 °F

    T-storms then
    Chance
    T-storms

  • Thursday

    Thursday: A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 82 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 62. Chance of precipitation is 30%.

    Low: 62 °F

    Chance
    T-storms then
    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 66. Light south wind.
Tuesday
Sunny, with a high near 86. Calm wind becoming south around 5 mph in the afternoon.
Tuesday Night
A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 68. Calm wind. Chance of precipitation is 20%.
Wednesday
Showers and thunderstorms. High near 81. West wind 3 to 6 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
Showers and thunderstorms before 2am, then a slight chance of showers. Low around 67. Light west wind. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
A chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 62. Chance of precipitation is 30%.
Friday
Sunny, with a high near 85.
Friday Night
Mostly clear, with a low around 65.
Saturday
Sunny, with a high near 87.
Saturday Night
Mostly clear, with a low around 66.
Sunday
Mostly sunny, with a high near 87.
Sunday Night
Partly cloudy, with a low around 67.
Monday
Mostly sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Twin Rocks PA
 40.51°N 78.87°W (Elev. 1831 ft)
Last Update:
1:52 am EDT Aug 12, 2025
Forecast Valid:
2am EDT Aug 12, 2025-6pm EDT Aug 18, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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