National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Areas of Showers and Thunderstorms to Start the Work Week

Areas of rain and thunderstorms are forecast Monday across the central and eastern states. Some mixed rain and snow is possible in the high Sierra Mountains. Heavy to excessive rain may bring flooding in the central Appalachians. Read More >

Hazardous Weather Conditions

Current conditions at

Pittsburgh/Butler Regional Airport (KBTP)

Lat: 40.78°NLon: 79.96°WElev: 1248ft.

Mostly Cloudy

62°F

17°C

Humidity 96%
Wind Speed NE 7 mph
Barometer 30.05 in (1017.5 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 21 Sep 1:56 am EDT
Extended Forecast for

Tarentum PA

Flood Watch September 21, 02:15am until September 21, 12:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch September 21, 02:15am until September 21, 12:00pm

    NOW until 12:00pm Mon

    Flood Watch

  • Overnight

    Low: 56 °F

    Chance
    Showers and
    Patchy Fog

  • Monday

    Monday: Showers likely, then showers and possibly a thunderstorm after 11am. Patchy fog between 4pm and 5pm. High near 65. East wind 11 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 65 °F

    Showers and
    Patchy Fog

  • Monday Night

    Monday Night: Showers, mainly before midnight. Low around 54. East wind 11 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 54 °F

    Showers

  • Tuesday

    Tuesday: Showers likely, mainly before 3pm. Cloudy, with a high near 65. East wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 65 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Showers likely, mainly after 8pm. Cloudy, with a low around 52. East wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 52 °F

    Showers
    Likely

  • Wednesday

    Wednesday: A chance of showers. Mostly cloudy, with a high near 64. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 64 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers. Mostly cloudy, with a low around 50. Chance of precipitation is 40%.

    Low: 50 °F

    Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 66.

    High: 66 °F

    Partly Sunny

Detailed Forecast

Overnight
A chance of showers. Patchy fog. Otherwise, mostly cloudy, with a low around 56. Northeast wind around 8 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Monday
Showers likely, then showers and possibly a thunderstorm after 11am. Patchy fog between 4pm and 5pm. High near 65. East wind 11 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Monday Night
Showers, mainly before midnight. Low around 54. East wind 11 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday
Showers likely, mainly before 3pm. Cloudy, with a high near 65. East wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday Night
Showers likely, mainly after 8pm. Cloudy, with a low around 52. East wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
A chance of showers. Mostly cloudy, with a high near 64. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 50. Chance of precipitation is 40%.
Thursday
Partly sunny, with a high near 66.
Thursday Night
Partly cloudy, with a low around 46.
Friday
Mostly sunny, with a high near 69.
Friday Night
Partly cloudy, with a low around 47.
Saturday
Mostly sunny, with a high near 69.
Saturday Night
Partly cloudy, with a low around 48.
Sunday
Mostly sunny, with a high near 72.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Tarentum PA
 40.61°N 79.75°W (Elev. 833 ft)
Last Update:
2:11 am EDT Sep 21, 2026
Forecast Valid:
2am EDT Sep 21, 2026-6pm EDT Sep 27, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation