Mammoth, Pennsylvania Weather
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Weather Forecast for Mammoth, Pennsylvania : Westmoreland County
Issued: 1:02 pm EDT Sep 3, 2025 Latitude: 40.2009043 Longitude: -79.4630927 View on Google Maps

MouseOver for Detail Forecast
This Afternoon Tonight Thursday Friday Saturday Sunday Monday Tuesday
Sunny on This Afternoon Mostly Clear on Tonight 90% chance of thunderstorms on Thursday Mostly Sunny on Friday 60% chance of rain on Saturday Mostly Sunny on Sunday Sunny on Monday Sunny on Tuesday
High: 82°F Low: 61°F High: 73°F High: 81°F High: 66°F High: 69°F High: 71°F High: 76°F
Low: 58°F Low: 59°F Low: 49°F Low: 45°F Low: 47°F  
Sunny Mostly Clear Thunderstorms Mostly Sunny Rain Mostly Sunny Sunny Sunny
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Current Conditions at
ALLEGHENY COUNTY ARPT - (KAGC)
81°
Partly Cloudy
as of 2:53 PM EDST
Rel. Humidity: 39%
Dew Point: 54°F
Visibility: 10 Miles
Pressure: 29.85 in.
Flight Rule: VFR
Wind Data
12 MPH
240° Southwest
Cloud Level(s): Few at 5500ft, Few at 7000ft, Scattered at 9500ft
Current Conditions at
JOHNSTOWN - (KJST)
75°
Mostly Cloudy
as of 2:54 PM EDST
Rel. Humidity: 33%
Dew Point: 45°F
Visibility: 10 Miles
Pressure: 29.91 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Broken at 7000ft, Broken at 8500ft
Current Conditions at
STEWART FIELD - (KIDI)
79°
Partly Cloudy
as of 2:55 PM EDST
Rel. Humidity: 34%
Dew Point: 48°F
Visibility: 10 Miles
Pressure: 29.87 in.
Flight Rule: VFR
Wind Data
6 MPH
Gust: 15 MPH
Cloud Level(s): Scattered at 7000ft, Scattered at 8000ft
Sunny on This Afternoon This Afternoon... Sunny, with a high near 82. Southwest wind around 7 mph.
Mostly Clear on Tonight Tonight... Mostly clear, with a low around 61. South wind 6 to 8 mph.
90% chance of thunderstorms Thursday Thursday... Showers and thunderstorms before 3pm, then showers and possibly a thunderstorm, mainly after 3pm. High near 73. Southwest wind 10 to 14 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
80% chance of thunderstorms Thursday Night Thursday Night... Showers and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Low around 58. Southwest wind around 6 mph becoming calm after midnight. 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 Friday Friday... Mostly sunny, with a high near 81. Southwest wind 6 to 15 mph.
60% chance of thunderstorms Friday Night Friday Night... A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 59. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
60% chance of rain Saturday Saturday... Showers likely, mainly before 8am. Mostly cloudy, with a high near 66. Chance of precipitation is 60%.
Cloudy on Saturday Night Saturday Night... Partly cloudy, with a low around 49.
Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 69.
Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 45.
Sunny on Monday Monday... Sunny, with a high near 71.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 47.
Sunny on Tuesday Tuesday... Sunny, with a high near 76.
Current Radar Image


Sun Almanac for Mammoth, Pennsylvania
Sunrise: 06:48 AM
Sunset: 7:46 PM
Civil Sunrise:06:20 AM
Civil Sunset: 8:14 PM
Nautical Sunrise: 05:47 AM
Nautical Sunset: 8:47 PM
Astro Sunrise: 05:13 AM
Astro Sunset: 9:21 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.