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.

A Few Clouds

79°F

26°C

Humidity 65%
Wind Speed SW 6 mph
Barometer 30.04 in (1016.8 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 19 May 6:53 pm EDT
Extended Forecast for

Herndon PA

  • Tonight

    Tonight: Partly cloudy, with a low around 69. Southwest wind around 5 mph becoming calm in the evening.

    Low: 69 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Showers and thunderstorms before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. High near 87. Calm wind becoming west 5 to 8 mph in the morning. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 87 °F

    Chance
    Showers then
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers after 2am. Mostly cloudy, with a low around 52. North wind around 6 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 52 °F

    Mostly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: A chance of showers, mainly before 8am. Mostly cloudy, with a high near 68. North wind 5 to 8 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.

    High: 68 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 48. Calm wind.

    Low: 48 °F

    Mostly Cloudy

  • Friday

    Friday: Showers likely, mainly after 2pm. Mostly cloudy, with a high near 65. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 65 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Showers. Low around 48. Chance of precipitation is 90%.

    Low: 48 °F

    Showers

  • Saturday

    Saturday: Showers. High near 59. Chance of precipitation is 90%.

    High: 59 °F

    Showers

  • Saturday Night

    Saturday Night: Showers, mainly before 2am. Low around 50. Chance of precipitation is 80%.

    Low: 50 °F

    Showers

Detailed Forecast

Tonight
Partly cloudy, with a low around 69. Southwest wind around 5 mph becoming calm in the evening.
Wednesday
Showers and thunderstorms before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. High near 87. Calm wind becoming west 5 to 8 mph in the morning. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
A chance of showers after 2am. Mostly cloudy, with a low around 52. North wind around 6 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
A chance of showers, mainly before 8am. Mostly cloudy, with a high near 68. North wind 5 to 8 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.
Thursday Night
Mostly cloudy, with a low around 48. Calm wind.
Friday
Showers likely, mainly after 2pm. Mostly cloudy, with a high near 65. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
Showers. Low around 48. Chance of precipitation is 90%.
Saturday
Showers. High near 59. Chance of precipitation is 90%.
Saturday Night
Showers, mainly before 2am. Low around 50. Chance of precipitation is 80%.
Sunday
Showers likely, mainly after 2pm. Mostly cloudy, with a high near 68. Chance of precipitation is 60%.
Sunday Night
Showers likely. Mostly cloudy, with a low around 54. Chance of precipitation is 60%.
Memorial Day
A chance of showers. Mostly cloudy, with a high near 76. Chance of precipitation is 40%.
Monday Night
A chance of showers. Mostly cloudy, with a low around 57. Chance of precipitation is 40%.
Tuesday
A chance of showers. Mostly cloudy, with a high near 77. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Herndon PA
 40.72°N 76.85°W (Elev. 397 ft)
Last Update:
5:25 pm EDT May 19, 2026
Forecast Valid:
7pm EDT May 19, 2026-6pm EDT May 26, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation