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

Harrisburg, Harrisburg International Airport (KMDT)

Lat: 40.19°NLon: 76.76°WElev: 312ft.

Mostly Cloudy

65°F

18°C

Humidity 84%
Wind Speed Calm
Barometer 30.07 in (1018.1 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 17 May 7:56 am EDT
Extended Forecast for

Marietta PA

  • Today

    Today: A chance of showers and thunderstorms, mainly after 5pm. Mostly sunny, with a high near 87. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 87 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 64. Calm wind.

    Low: 64 °F

    Decreasing
    Clouds

  • Monday

    Monday: Sunny and hot, with a high near 92. Calm wind becoming south around 6 mph in the afternoon.

    High: 92 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 68. South wind 6 to 8 mph.

    Low: 68 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny and hot, with a high near 93. Calm wind becoming southwest 5 to 9 mph in the afternoon.

    High: 93 °F

    Hot

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm after 2pm. High near 90. Chance of precipitation is 80%.

    High: 90 °F

    Sunny then
    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm before 8pm. Low around 55. Chance of precipitation is 80%.

    Low: 55 °F

    Showers then
    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 71.

    High: 71 °F

    Partly Sunny

Detailed Forecast

Today
A chance of showers and thunderstorms, mainly after 5pm. Mostly sunny, with a high near 87. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 64. Calm wind.
Monday
Sunny and hot, with a high near 92. Calm wind becoming south around 6 mph in the afternoon.
Monday Night
Mostly clear, with a low around 68. South wind 6 to 8 mph.
Tuesday
Mostly sunny and hot, with a high near 93. Calm wind becoming southwest 5 to 9 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 70.
Wednesday
Showers and possibly a thunderstorm after 2pm. High near 90. Chance of precipitation is 80%.
Wednesday Night
Showers and possibly a thunderstorm before 8pm. Low around 55. Chance of precipitation is 80%.
Thursday
Partly sunny, with a high near 71.
Thursday Night
A chance of showers after 2am. Mostly cloudy, with a low around 51. Chance of precipitation is 30%.
Friday
A chance of showers. Partly sunny, with a high near 67. Chance of precipitation is 50%.
Friday Night
A chance of showers. Mostly cloudy, with a low around 51. Chance of precipitation is 30%.
Saturday
A chance of showers. Mostly cloudy, with a high near 70. Chance of precipitation is 50%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marietta PA
 40.07°N 76.56°W (Elev. 299 ft)
Last Update:
8:01 am EDT May 17, 2026
Forecast Valid:
8am EDT May 17, 2026-6pm EDT May 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