Penngrove Weather Forecast

    • 51
    • 79

    Becoming Sunny

    • 54
    • 86

    Partly Sunny

    • 56
    • 84

    Partly Sunny

    • 48
    • 78

    Partly Sunny

    • 49
    • 75

    Partly Sunny

    • 49
    • 73

    Mostly Sunny

    • 51
    • 77

    Mostly Sunny

Today 22 Sep North Bay Interior Valleys

Sunny. Highs in the lower 70s to mid 80s. Southwest Winds 5 to 10 Mph.

Tonight 22 Sep North Bay Interior Valleys

Mostly clear except patchy fog in the evening. Areas of fog after midnight. Lows in the 40s to upper 50s. West Winds 5 to 10 Mph.

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  • Temperature Real-Time

Penngrove Temperature Statistics

September Temperature

Petaluma Municipal Airport (4.3 miles)

  • Lowest 7 September, 2026

    44.6 °F

  • Average September

    64.4 °F

  • Highest 9 September, 2026

    96.8 °F

Climate (2021–2026)

Petaluma Municipal Airport (4.3 miles)

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  • Average Low 2021–2026

    44.7 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    68.5 °F
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