Big Mountain, Pennsylvania Weather
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Weather Forecast for Big Mountain, Pennsylvania : Northumberland County
Issued: 10:46 pm EDT Sep 4, 2025 Latitude: 40.7706413 Longitude: -76.5335692 View on Google Maps

MouseOver for Detail Forecast
Tonight Friday Saturday Sunday Monday Tuesday Wednesday Thursday
30% chance of rain on Tonight Morning Fog on Friday 80% chance of thunderstorms on Saturday Mostly Sunny on Sunday Sunny on Monday Sunny on Tuesday Sunny on Wednesday Mostly Sunny on Thursday
Low: 60°F High: 80°F High: 76°F High: 70°F High: 69°F High: 71°F High: 73°F High: 74°F
Low: 63°F Low: 52°F Low: 46°F Low: 45°F Low: 47°F Low: 50°F  
Rain Morning Fog Thunderstorms Mostly Sunny Sunny Sunny Sunny Mostly Sunny
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Current Conditions at
SELINSGROVE - (KSEG)
63°
Mostly Cloudy
as of 10:53 PM EDST
Rel. Humidity: 100%
Dew Point: 63°F
Visibility: 7 Miles
Pressure: 29.83 in.
Flight Rule: VFR
Wind Data
3 MPH
350° North
Cloud Level(s): Few at 2900ft, Scattered at 4700ft, Broken at 6000ft
Current Conditions at
MUIR AAF - (KMUI)
66°
Cloudy
as of 10:52 PM EDST
Rel. Humidity: 100%
Dew Point: 66°F
Visibility: 10 Miles
Pressure: 29.80 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Broken at 6000ft, Solid Overcast at 8000ft
Current Conditions at
WILLIAMSPORT - (KIPT)
63°
Mostly Cloudy
as of 10:54 PM EDST
Rel. Humidity: 93%
Dew Point: 61°F
Visibility: 10 Miles
Pressure: 29.82 in.
Flight Rule: VFR
Wind Data
7 MPH
280° West
Cloud Level(s): Scattered at 7000ft, Broken at 8000ft, Broken at 10000ft
Current Conditions at
READING - (KRDG)
68°
Cloudy
Light Thunderstorm Rain
as of 11:01 PM EDST
Rel. Humidity: 88%
Dew Point: 64°F
Visibility: 7 Miles
Pressure: 29.82 in.
Flight Rule: VFR
Wind Data
5 MPH
110° East
Cloud Level(s): Few at 1600ft, Broken at 5000ft, Solid Overcast at 8000ft
30% chance of rain Tonight Tonight... A chance of showers, mainly before midnight. Patchy fog. Otherwise, mostly cloudy, with a low around 60. Light southwest wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Morning Fog on Friday Friday... Areas of fog before 9am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 80. Calm wind becoming southwest 5 to 8 mph in the morning. Winds could gust as high as 21 mph.
Cloudy on Friday Night Friday Night... Partly cloudy, with a low around 63. South wind around 5 mph becoming calm in the evening.
80% chance of thunderstorms Saturday Saturday... A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers and possibly a thunderstorm after 2pm. High near 76. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
80% chance of thunderstorms Saturday Night Saturday Night... Showers and possibly a thunderstorm before 8pm, then a chance of showers. Low around 52. Light northwest wind. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 70.
Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 46.
Sunny on Monday Monday... Sunny, with a high near 69.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 45.
Sunny on Tuesday Tuesday... Sunny, with a high near 71.
Mostly Clear on Tuesday Night Tuesday Night... Mostly clear, with a low around 47.
Sunny on Wednesday Wednesday... Sunny, with a high near 73.
Mostly Clear on Wednesday Night Wednesday Night... Mostly clear, with a low around 50.
Mostly Sunny on Thursday Thursday... Mostly sunny, with a high near 74.
Current Radar Image


Sun Almanac for Big Mountain, Pennsylvania
Sunrise: 06:37 AM
Sunset: 7:33 PM
Civil Sunrise:06:09 AM
Civil Sunset: 8:01 PM
Nautical Sunrise: 05:35 AM
Nautical Sunset: 8:35 PM
Astro Sunrise: 05:01 AM
Astro Sunset: 9:09 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.