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Fire Weather Issues; Pacific System Moving Inland

Dry fuels, strong winds and dry weather will continue to bring elevated to critical fire weather conditions to the areas of the Plains, Midwest and Southeast today. A Pacific storm system will bring low elevation rain and heavy high elevation mountain snow to California through early week, expanding into the Pacific Northwest, Great Basin, and southern California on Tuesday. Read More >

Hazardous Weather Conditions

Current conditions at

Selinsgrove Penn Valley Airport (KSEG)

Lat: 40.82°NLon: 76.87°WElev: 443ft.

Mostly Cloudy

42°F

6°C

Humidity 62%
Wind Speed NW 10 G 20 mph
Barometer 30.20 in (1023.0 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 20 Apr 8:53 am EDT
Extended Forecast for

Mechanicsville PA

Freeze Warning April 21, 12:00am until April 21, 09:00am
Click here for hazard details and duration
Freeze Warning

  • Today

    Today: Isolated showers before 10am. Mostly sunny, with a high near 47. Northwest wind 8 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.

    High: 47 °F

    Isolated
    Showers then
    Mostly Sunny

  • Tonight

    Tonight: Widespread frost after 3am. Otherwise, mostly clear, with a low around 26. North wind 5 to 7 mph becoming calm in the evening.

    Low: 26 °F

    Partly Cloudy
    then Frost

  • Tuesday

    Tuesday: Widespread frost before 7am. Otherwise, increasing clouds, with a high near 53. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 53 °F

    Frost then
    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers. Mostly cloudy, with a low around 42. South wind around 6 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 42 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A slight chance of showers. Mostly sunny, with a high near 66. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 20%.

    High: 66 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 70.

    High: 70 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 45.

    Low: 45 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 70.

    High: 70 °F

    Mostly Sunny

Detailed Forecast

Today
Isolated showers before 10am. Mostly sunny, with a high near 47. Northwest wind 8 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Tonight
Widespread frost after 3am. Otherwise, mostly clear, with a low around 26. North wind 5 to 7 mph becoming calm in the evening.
Tuesday
Widespread frost before 7am. Otherwise, increasing clouds, with a high near 53. Calm wind becoming southwest around 6 mph in the afternoon.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 42. South wind around 6 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
A slight chance of showers. Mostly sunny, with a high near 66. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 20%.
Wednesday Night
Partly cloudy, with a low around 43.
Thursday
Sunny, with a high near 70.
Thursday Night
Mostly clear, with a low around 45.
Friday
Mostly sunny, with a high near 70.
Friday Night
A chance of showers after 8pm. Mostly cloudy, with a low around 49. Chance of precipitation is 40%.
Saturday
A chance of showers. Mostly cloudy, with a high near 58. Chance of precipitation is 50%.
Saturday Night
Showers likely. Mostly cloudy, with a low around 46. Chance of precipitation is 60%.
Sunday
A chance of showers. Mostly cloudy, with a high near 61. Chance of precipitation is 40%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mechanicsville PA
 40.98°N 76.57°W (Elev. 961 ft)
Last Update:
8:06 am EDT Apr 20, 2026
Forecast Valid:
8am EDT Apr 20, 2026-6pm EDT Apr 26, 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