Tarentum Weather Forecast

    • 57
    • 70

    Mostly Cloudy

    • 58
    • 68

    Mostly Cloudy

    • 56
    • 74

    Partly Sunny

    • 58
    • 77

    Partly Sunny

    • 61
    • 82

    Chance Rain Showers

    • 50
    • 73

    Chance Rain Showers

Today 27 Sep Allegheny

Partly sunny. Near steady temperature in the upper 60s. North Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 27 Sep Allegheny

Considerable cloudiness. Lows in the mid 50s. North Winds 10 to 15 Mph.

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Tarentum Temperature Statistics

September Temperature

Butler, Butler County Airport/K W Scholter Field (15.5 miles)

  • Lowest 25 September, 2026

    39 °F

  • Average September

    67.6 °F

  • Highest 2 September, 2026

    91.9 °F

Climate (2021–2026)

Butler, Butler County Airport/K W Scholter Field (15.5 miles)

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  • Average Low 2021–2026

    42 °F

  • Average 2021–2026

    51.4 °F

  • Average High 2021–2026

    60.6 °F
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