Grand Valley Weather Forecast

    • 49
    • 75

    Partly Sunny

    • 50
    • 76

    Partly Sunny

    • 60
    • 80

    Partly Sunny

    • 63
    • 85

    Chance Rain Showers

    • 51
    • 74

    Slight Chance Rain Showers

    • 50
    • 71

    Partly Sunny

Today 6 Sep Warren

Patchy fog this morning. Mostly sunny. Highs in the mid 70s. Northeast Winds around 5 Mph.

Tonight 6 Sep Warren

Mostly clear in the Evening, then becoming partly cloudy. Patchy fog after midnight. Lows in the upper 40s. Northeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grand Valley Temperature Statistics

September Temperature

Franklin, Venango Regional Airport (28.6 miles)

  • Lowest 3 September, 2026

    66 °F

  • Average September

    74.1 °F

  • Highest 2 September, 2026

    87.1 °F

Climate (2021–2026)

Franklin, Venango Regional Airport (28.6 miles)

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  • Average Low 2021–2026

    40.7 °F

  • Average 2021–2026

    49.4 °F

  • Average High 2021–2026

    58.2 °F
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