Big Mountain, Pennsylvania Weather
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Weather Forecast for Big Mountain, Pennsylvania : Northumberland County
Issued: 10:48 pm EDT Jul 6, 2025 Latitude: 40.7706413 Longitude: -76.5335692 View on Google Maps

MouseOver for Detail Forecast
Tonight Monday Tuesday Wednesday Thursday Friday Saturday Sunday
Increasing Clouds on Tonight 40% chance of thunderstorms on Monday 50% chance of thunderstorms on Tuesday 30% chance of thunderstorms on Wednesday 70% chance of thunderstorms on Thursday 60% chance of thunderstorms on Friday 70% chance of thunderstorms on Saturday 60% chance of thunderstorms on Sunday
Low: 69°F High: 86°F High: 83°F High: 84°F High: 81°F High: 80°F High: 80°F High: 81°F
Low: 69°F Low: 66°F Low: 67°F Low: 66°F Low: 66°F Low: 65°F  
Increasing Clouds Thunderstorms Thunderstorms Thunderstorms Thunderstorms Thunderstorms Thunderstorms Thunderstorms
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Current Conditions at
SELINSGROVE - (KSEG)
73°
Clear
as of 10:53 PM EDST
Rel. Humidity: 88%
Dew Point: 70°F
Visibility: 10 Miles
Pressure: 29.99 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
MUIR AAF - (KMUI)
79°
Mostly Cloudy
as of 10:55 PM EDST
Rel. Humidity: 78%
Dew Point: 72°F
Visibility: 10 Miles
Pressure: 30.00 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Broken at 4600ft
Current Conditions at
WILLIAMSPORT - (KIPT)
75°
Clear
as of 10:54 PM EDST
Rel. Humidity: 73%
Dew Point: 66°F
Visibility: 10 Miles
Pressure: 29.97 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
READING - (KRDG)
79°
Clear
as of 10:54 PM EDST
Rel. Humidity: 78%
Dew Point: 72°F
Visibility: 10 Miles
Pressure: 30.00 in.
Flight Rule: VFR
Wind Data
8 MPH
160° South
Cloud Level(s): Clear
Increasing Clouds on Tonight Tonight... Increasing clouds, with a low around 69. Light south wind.
40% chance of thunderstorms Monday Monday... A slight chance of showers, then a chance of showers and thunderstorms after 11am. Mostly cloudy, with a high near 86. South wind 3 to 5 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
30% chance of thunderstorms Monday Night Monday Night... A chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 69. Calm wind. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
50% chance of thunderstorms Tuesday Tuesday... A slight chance of showers, then a chance of showers and thunderstorms after 11am. Mostly sunny, with a high near 83. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
30% chance of thunderstorms Tuesday Night Tuesday Night... A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 66. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
30% chance of thunderstorms Wednesday Wednesday... A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 84. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
30% chance of thunderstorms Wednesday Night Wednesday Night... A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 67. Chance of precipitation is 30%.
70% chance of thunderstorms Thursday Thursday... Showers likely and possibly a thunderstorm, mainly after 2pm. Mostly cloudy, with a high near 81. Chance of precipitation is 70%.
60% chance of thunderstorms Thursday Night Thursday Night... Showers likely and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
60% chance of thunderstorms Friday Friday... Showers likely and possibly a thunderstorm, mainly after 2pm. Mostly cloudy, with a high near 80. Chance of precipitation is 60%.
60% chance of thunderstorms Friday Night Friday Night... Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
70% chance of thunderstorms Saturday Saturday... Showers likely and possibly a thunderstorm. Partly sunny, with a high near 80. Chance of precipitation is 70%.
60% chance of thunderstorms Saturday Night Saturday Night... Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.
60% chance of thunderstorms Sunday Sunday... Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 81. Chance of precipitation is 60%.
Current Radar Image


Sun Almanac for Big Mountain, Pennsylvania
Sunrise: 05:42 AM
Sunset: 8:40 PM
Civil Sunrise:05:09 AM
Civil Sunset: 9:13 PM
Nautical Sunrise: 04:27 AM
Nautical Sunset: 9:55 PM
Astro Sunrise: 03:38 AM
Astro Sunset: 10:44 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.