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Arnold, Pennsylvania Weather Forecast
Arnold, Pennsylvania Weather
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Weather Forecast for Arnold, Pennsylvania : Westmoreland County
Issued: 8:39 pm EST Jan 18, 2026 Latitude: 40.5800669 Longitude: -79.7667152 View on Google Maps

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Tonight M.L.King Day Tuesday Wednesday Thursday Friday Saturday Sunday
60% chance of snow on Tonight 30% chance of snow on M.L.King Day Mostly Sunny on Tuesday 50% chance of rain & snow on Wednesday 40% chance of snow on Thursday Partly Sunny on Friday 40% chance of snow on Saturday 50% chance of snow on Sunday
Low: 17°F High: 27°F High: 19°F High: 38°F High: 31°F High: 28°F High: 24°F High: 18°F
Low: 5 °F Low: 8 °F Low: 24°F Low: 10°F Low: 14°F Low: 7 °F  
Snow Snow Mostly Sunny Rain & Snow Snow Partly Sunny Snow Snow
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Current Conditions at
BUTLER COUNTY - (KBTP)
18°
Cloudy
as of 7:56 PM EST
Rel. Humidity: 67%
Dew Point: 9°F
Visibility: 10 Miles
Pressure: 29.96 in.
Flight Rule: MVFR
Wind Data
8 MPH
260° West
Cloud Level(s): Solid Overcast at 3000ft
Current Conditions at
ALLEGHENY COUNTY ARPT - (KAGC)
19°
Cloudy
as of 7:53 PM EST
Rel. Humidity: 67%
Dew Point: 10°F
Visibility: 10 Miles
Pressure: 29.95 in.
Flight Rule: VFR
Wind Data
5 MPH
310° Northwest
Cloud Level(s): Solid Overcast at 3500ft
Current Conditions at
PITTSBURGH - (KPIT)
18°
Cloudy
as of 7:51 PM EST
Rel. Humidity: 67%
Dew Point: 9°F
Visibility: 10 Miles
Pressure: 29.96 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Solid Overcast at 3200ft
Current Conditions at
LATROBE - (KLBE)
21°
Cloudy
as of 7:47 PM EST
Rel. Humidity: 79%
Dew Point: 16°F
Visibility: 10 Miles
Pressure: 29.96 in.
Flight Rule: VFR
Wind Data
6 MPH
250° West
Cloud Level(s): Solid Overcast at 3900ft
60% chance of snow Tonight Tonight... Snow likely, mainly after 5am. Mostly cloudy, with a low around 17. Calm wind becoming southwest 5 to 7 mph in the evening. Winds could gust as high as 21 mph. Chance of precipitation is 60%. Total nighttime snow accumulation of less than a half inch possible.
30% chance of snow M.L.King Day M.L.King Day... A chance of snow showers between 11am and 4pm. Mostly cloudy, with a high near 27. Breezy, with a southwest wind 10 to 15 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 36 mph. Chance of precipitation is 30%. New snow accumulation of less than one inch possible.
Mostly Cloudy on Monday Night Monday Night... Mostly cloudy, with a low around 5. Wind chill values as low as -7. West wind 9 to 16 mph, with gusts as high as 26 mph.
Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 19. Wind chill values as low as -8. West wind 9 to 14 mph, with gusts as high as 28 mph.
Mostly Clear on Tuesday Night Tuesday Night... Mostly clear, with a low around 8. Southwest wind 3 to 6 mph.
50% chance of rain & snow Wednesday Wednesday... A slight chance of snow showers before 1pm, then a chance of rain and snow showers. Mostly cloudy, with a high near 38. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.
60% chance of rain & snow Wednesday Night Wednesday Night... Rain and snow showers likely, becoming all snow after 1am. Mostly cloudy, with a low around 24. Chance of precipitation is 60%.
40% chance of snow Thursday Thursday... A chance of snow showers before 1pm. Partly sunny, with a high near 31. Chance of precipitation is 40%.
Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 10.
Partly Sunny on Friday Friday... Partly sunny, with a high near 28.
30% chance of snow Friday Night Friday Night... A chance of snow showers. Mostly cloudy, with a low around 14. Chance of precipitation is 30%.
40% chance of snow Saturday Saturday... A chance of snow showers. Partly sunny, with a high near 24. Chance of precipitation is 40%.
40% chance of snow Saturday Night Saturday Night... A chance of snow showers. Mostly cloudy, with a low around 7. Chance of precipitation is 40%.
50% chance of snow Sunday Sunday... A chance of snow showers. Mostly cloudy, with a high near 18. Chance of precipitation is 50%.
Current Radar Image


Sun Almanac for Arnold, Pennsylvania
Sunrise: 07:39 AM
Sunset: 5:20 PM
Civil Sunrise:07:09 AM
Civil Sunset: 5:50 PM
Nautical Sunrise: 06:36 AM
Nautical Sunset: 6:23 PM
Astro Sunrise: 06:03 AM
Astro Sunset: 6:56 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.