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Arnold, Pennsylvania Weather Forecast
Arnold, Pennsylvania Weather
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Weather Forecast for Arnold, Pennsylvania : Westmoreland County
Issued: 3:56 pm EST Jan 17, 2026 Latitude: 40.5800669 Longitude: -79.7667152 View on Google Maps

MouseOver for Detail Forecast
This Afternoon Tonight Sunday M.L.King Day Tuesday Wednesday Thursday Friday Saturday
30% chance of snow on This Afternoon 30% chance of snow on Tonight Partly Sunny on Sunday 50% chance of snow on M.L.King Day Mostly Sunny on Tuesday 30% chance of snow on Wednesday 30% chance of snow on Thursday Partly Sunny on Friday 20% chance of snow on Saturday
High: 37°F Low: 18°F High: 26°F High: 26°F High: 17°F High: 37°F High: 30°F High: 31°F High: 30°F
Low: 16°F Low: 5°F Low: 9°F Low: 21°F Low: 12°F Low: 18°F  
Snow Snow Partly Sunny Snow Mostly Sunny Snow Snow Partly Sunny Snow
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Current Conditions at
BUTLER COUNTY - (KBTP)
34°
Feels like 25°F
Mostly Cloudy
as of 4:56 PM EST
Rel. Humidity: 74%
Dew Point: 27°F
Visibility: 10 Miles
Pressure: 29.98 in.
Flight Rule: VFR
Wind Data
10 MPH
230° Southwest
Cloud Level(s): Broken at 5000ft
Current Conditions at
ALLEGHENY COUNTY ARPT - (KAGC)
36°
Feels like 28°F
Cloudy
as of 4:53 PM EST
Rel. Humidity: 64%
Dew Point: 25°F
Visibility: 10 Miles
Pressure: 29.98 in.
Flight Rule: VFR
Wind Data
9 MPH
240° Southwest
Cloud Level(s): Broken at 4200ft, Solid Overcast at 5000ft
Current Conditions at
PITTSBURGH - (KPIT)
36°
Mostly Cloudy
as of 4:51 PM EST
Rel. Humidity: 59%
Dew Point: 23°F
Visibility: 10 Miles
Pressure: 29.97 in.
Flight Rule: VFR
Wind Data
8 MPH
Gust: 23 MPH
240° Southwest
Cloud Level(s): Broken at 3500ft, Broken at 5000ft
30% chance of snow This Afternoon This Afternoon... A chance of snow showers. Partly sunny, with a high near 37. Calm wind. Chance of precipitation is 30%. Total daytime snow accumulation of less than a half inch possible.

30% chance of snow Tonight Tonight... A chance of snow, mainly between 1am and 4am. Mostly cloudy, with a low around 18. West wind around 6 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.

Partly Sunny on Sunday Sunday... Partly sunny, with a high near 26. West wind 5 to 9 mph.

30% chance of snow Sunday Night Sunday Night... A chance of snow showers after 1am. Mostly cloudy, with a low around 16. Light southwest wind increasing to 5 to 9 mph in the evening. Chance of precipitation is 30%. Little or no snow accumulation expected.

50% chance of snow M.L.King Day M.L.King Day... A chance of snow showers before 1pm. Mostly cloudy, with a high near 26. West wind 10 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.

Mostly Cloudy on Monday Night Monday Night... Mostly cloudy, with a low around 5.

Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 17.

Cloudy on Tuesday Night Tuesday Night... Partly cloudy, with a low around 9.

30% chance of snow Wednesday Wednesday... A chance of snow showers after 1pm. Partly sunny, with a high near 37. Chance of precipitation is 30%.

40% chance of snow Wednesday Night Wednesday Night... A chance of snow showers. Mostly cloudy, with a low around 21. Chance of precipitation is 40%.

30% chance of snow Thursday Thursday... A chance of snow showers. Partly sunny, with a high near 30. Chance of precipitation is 30%.

Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 12.

Partly Sunny on Friday Friday... Partly sunny, with a high near 31.

30% chance of snow Friday Night Friday Night... A chance of snow showers. Mostly cloudy, with a low around 18. Chance of precipitation is 30%.

20% chance of snow Saturday Saturday... A chance of snow showers. Mostly cloudy, with a high near 30.

Sun Almanac for Arnold, Pennsylvania
Sunrise: 07:40 AM
Sunset: 5:19 PM
Civil Sunrise:07:10 AM
Civil Sunset: 5:49 PM
Nautical Sunrise: 06:36 AM
Nautical Sunset: 6:22 PM
Astro Sunrise: 06:03 AM
Astro Sunset: 6:55 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.