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

Selinsgrove Penn Valley Airport (KSEG)

Lat: 40.82°NLon: 76.87°WElev: 443ft.

Overcast

45°F

7°C

Humidity 90%
Wind Speed Calm
Barometer 29.97 in (1015.0 mb)
Dewpoint 42°F (6°C)
Visibility 7.00 mi
Last update 21 Nov 5:53 pm EST
Extended Forecast for

Herndon PA

  • Tonight

    Tonight: Rain, mainly after 2am. Patchy fog after midnight. Low around 41. Calm wind. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 41 °F

    Slight Chance
    Rain then
    Rain and
    Patchy Fog

  • Saturday

    Saturday: A chance of rain, mainly before 8am. Patchy fog before 9am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 52. Calm wind becoming north around 6 mph in the afternoon. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    High: 52 °F

    Chance Rain
    and Patchy
    Fog then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 28. Calm wind.

    Low: 28 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 53. Calm wind becoming west 5 to 7 mph in the afternoon.

    High: 53 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 31. Light west wind.

    Low: 31 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 53.

    High: 53 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 34.

    Low: 34 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A chance of rain. Cloudy, with a high near 50. Chance of precipitation is 50%.

    High: 50 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: A chance of rain before 1am. Cloudy, with a low around 43. Chance of precipitation is 50%.

    Low: 43 °F

    Chance Rain

Detailed Forecast

Tonight
Rain, mainly after 2am. Patchy fog after midnight. Low around 41. Calm wind. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
A chance of rain, mainly before 8am. Patchy fog before 9am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 52. Calm wind becoming north around 6 mph in the afternoon. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Saturday Night
Partly cloudy, with a low around 28. Calm wind.
Sunday
Mostly sunny, with a high near 53. Calm wind becoming west 5 to 7 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 31. Light west wind.
Monday
Mostly sunny, with a high near 53.
Monday Night
Mostly cloudy, with a low around 34.
Tuesday
A chance of rain. Cloudy, with a high near 50. Chance of precipitation is 50%.
Tuesday Night
A chance of rain before 1am. Cloudy, with a low around 43. Chance of precipitation is 50%.
Wednesday
A chance of showers. Mostly cloudy, with a high near 60. Chance of precipitation is 30%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 35. Chance of precipitation is 30%.
Thanksgiving Day
Mostly sunny, with a high near 46.
Thursday Night
Partly cloudy, with a low around 28.
Friday
Partly sunny, with a high near 42.
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ABOUT THIS FORECAST

 
Point Forecast:
Herndon PA
 40.72°N 76.85°W (Elev. 397 ft)
Last Update:
2:51 pm EST Nov 21, 2025
Forecast Valid:
6pm EST Nov 21, 2025-6pm EST Nov 28, 2025
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation