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

Muir Army Air Field / Indiantown (KMUI)

Lat: 40.44°NLon: 76.56°WElev: 476ft.

Fair

63°F

17°C

Humidity 90%
Wind Speed Calm
Barometer 30.05 in (1017.7 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 25 Aug 10:55 pm EDT
Extended Forecast for

3 Miles NNW Mount Gretna PA

  • Overnight

    Overnight: Patchy fog after 4am. Otherwise, partly cloudy, with a low around 58. Calm wind.

    Low: 58 °F

    Patchy Fog

  • Wednesday

    Wednesday: Mostly sunny, with a high near 85. Calm wind becoming south around 6 mph in the afternoon.

    High: 85 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms after 2am. Partly cloudy, with a low around 68. Southeast wind around 8 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 68 °F

    Partly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 86. South wind 7 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 86 °F

    Chance
    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 66. South wind 5 to 8 mph becoming calm in the evening. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 66 °F

    Showers

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 84. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 84 °F

    Chance
    Showers then
    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 63. Chance of precipitation is 30%.

    Low: 63 °F

    Chance
    T-storms then
    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy

Detailed Forecast

Overnight
Patchy fog after 4am. Otherwise, partly cloudy, with a low around 58. Calm wind.
Wednesday
Mostly sunny, with a high near 85. Calm wind becoming south around 6 mph in the afternoon.
Wednesday Night
A chance of showers and thunderstorms after 2am. Partly cloudy, with a low around 68. Southeast wind around 8 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 86. South wind 7 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 66. South wind 5 to 8 mph becoming calm in the evening. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 84. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday Night
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 63. Chance of precipitation is 30%.
Saturday
Mostly sunny, with a high near 83.
Saturday Night
Partly cloudy, with a low around 63.
Sunday
Mostly sunny, with a high near 85.
Sunday Night
Partly cloudy, with a low around 67.
Monday
Mostly sunny, with a high near 88.
Monday Night
Partly cloudy, with a low around 70.
Tuesday
Partly sunny, with a high near 88.
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Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW Mount Gretna PA
 40.28°N 76.49°W (Elev. 499 ft)
Last Update:
9:26 pm EDT Aug 25, 2026
Forecast Valid:
1am EDT Aug 26, 2026-6pm EDT Sep 1, 2026
 
Forecast Discussion
 
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Additional Resources

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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