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

Heat the Southwest; Fire Weather in the Central U.S.; Kona Low Impacting Hawaii

A rare March heat wave is ongoing with much above-normal temperatures over the Southwest U.S. through this weekend. Periods of critical fire weather will persist from the central Rockies to the central and southern Plains through the weekend as gusty winds and low relative humidity continue. A Kona low will continue to bring several rounds of moderate to heavy rainfall to Hawaii through Sunday. Read More >

Current conditions at

Selinsgrove Penn Valley Airport (KSEG)

Lat: 40.82°NLon: 76.87°WElev: 443ft.

Fair

50°F

10°C

Humidity 59%
Wind Speed NE 12 mph
Barometer 29.95 in (1014.3 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 21 Mar 3:53 pm EDT
Extended Forecast for

Millersburg PA

  • Tonight

    Tonight: Mostly cloudy, with a low around 44. Light and variable wind.

    Low: 44 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of showers and thunderstorms, mainly after 4pm. Some of the storms could be severe. Mostly cloudy, then gradually becoming sunny, with a high near 74. Southeast wind 5 to 8 mph becoming southwest in the afternoon. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 74 °F

    Partly Sunny
    then Severe
    Thunderstorms

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm. Low around 39. North wind 5 to 8 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 39 °F

    Showers

  • Monday

    Monday: Cloudy through mid morning, then gradual clearing, with a high near 48. North wind around 11 mph, with gusts as high as 25 mph.

    High: 48 °F

    Gradual
    Clearing

  • Monday Night

    Monday Night: Mostly clear, with a low around 29. North wind 3 to 7 mph. Winds could gust as high as 20 mph.

    Low: 29 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 48.

    High: 48 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 54.

    High: 54 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 44. Light and variable wind.
Sunday
A chance of showers and thunderstorms, mainly after 4pm. Some of the storms could be severe. Mostly cloudy, then gradually becoming sunny, with a high near 74. Southeast wind 5 to 8 mph becoming southwest in the afternoon. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Showers and possibly a thunderstorm. Low around 39. North wind 5 to 8 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Monday
Cloudy through mid morning, then gradual clearing, with a high near 48. North wind around 11 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 29. North wind 3 to 7 mph. Winds could gust as high as 20 mph.
Tuesday
Sunny, with a high near 48.
Tuesday Night
Mostly cloudy, with a low around 33.
Wednesday
Mostly cloudy, with a high near 54.
Wednesday Night
Mostly cloudy, with a low around 37.
Thursday
A chance of showers after 2pm. Partly sunny, with a high near 58. Chance of precipitation is 30%.
Thursday Night
Showers likely. Mostly cloudy, with a low around 41. Chance of precipitation is 60%.
Friday
A chance of showers. Mostly sunny, with a high near 49. Chance of precipitation is 30%.
Friday Night
Partly cloudy, with a low around 27.
Saturday
Mostly sunny, with a high near 47.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Millersburg PA
 40.55°N 76.94°W (Elev. 525 ft)
Last Update:
2:21 pm EDT Mar 21, 2026
Forecast Valid:
4pm EDT Mar 21, 2026-6pm EDT Mar 28, 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