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

Hazardous Weather Conditions

Current conditions at

Selinsgrove Penn Valley Airport (KSEG)

Lat: 40.82°NLon: 76.87°WElev: 443ft.

Fair

79°F

26°C

Humidity 60%
Wind Speed Calm
Barometer 30.06 in (1017.6 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 18 May 8:53 pm EDT
Extended Forecast for

Mechanicsville PA

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and midnight. Partly cloudy, with a low around 67. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 67 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 90. Calm wind becoming west 5 to 9 mph in the afternoon. Winds could gust as high as 22 mph.

    High: 90 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 69. Southwest wind 3 to 5 mph.

    Low: 69 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Showers likely, then showers and possibly a thunderstorm after 11am. High near 84. Southwest wind 6 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 84 °F

    Showers
    Likely then
    Showers

  • Wednesday Night

    Wednesday Night: Showers before 8pm. Low around 49. North wind around 9 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 49 °F

    Showers then
    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 67.

    High: 67 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 47.

    Low: 47 °F

    Partly Cloudy

  • Friday

    Friday: A chance of showers. Partly sunny, with a high near 66. Chance of precipitation is 40%.

    High: 66 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Showers. Low around 49. Chance of precipitation is 80%.

    Low: 49 °F

    Showers

Detailed Forecast

Tonight
A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and midnight. Partly cloudy, with a low around 67. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Tuesday
Mostly sunny, with a high near 90. Calm wind becoming west 5 to 9 mph in the afternoon. Winds could gust as high as 22 mph.
Tuesday Night
Partly cloudy, with a low around 69. Southwest wind 3 to 5 mph.
Wednesday
Showers likely, then showers and possibly a thunderstorm after 11am. High near 84. Southwest wind 6 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers before 8pm. Low around 49. North wind around 9 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
Partly sunny, with a high near 67.
Thursday Night
Partly cloudy, with a low around 47.
Friday
A chance of showers. Partly sunny, with a high near 66. Chance of precipitation is 40%.
Friday Night
Showers. Low around 49. Chance of precipitation is 80%.
Saturday
Showers. High near 62. Chance of precipitation is 80%.
Saturday Night
Showers likely. Mostly cloudy, with a low around 52. Chance of precipitation is 70%.
Sunday
Showers likely. Mostly cloudy, with a high near 69. Chance of precipitation is 60%.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 55. Chance of precipitation is 50%.
Memorial Day
A chance of showers. Mostly cloudy, with a high near 73. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mechanicsville PA
 40.98°N 76.6°W (Elev. 968 ft)
Last Update:
8:06 pm EDT May 18, 2026
Forecast Valid:
9pm EDT May 18, 2026-6pm EDT May 25, 2026
 
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