Grassy Lake Weather Forecast

    • 62
    • 87

    Partly Sunny

    • 56
    • 86

    Partly Sunny

    • 47
    • 78

    Sunny

    • 42
    • 61

    Mostly Sunny

    • 47
    • 67

    Mostly Sunny

    • 49
    • 72

    Mostly Sunny

    • 48
    • 69

    Mostly Sunny

Today 9 Sep Northeastern Interior Mendocino

Sunny then becoming mostly cloudy late in the morning then becoming sunny. Highs 89 to 104.

Tonight 9 Sep Northeastern Interior Mendocino

Partly cloudy then becoming mostly cloudy late in the evening then becoming partly cloudy. Lows 60 to 70.

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Grassy Lake Temperature Statistics

September Temperature

Ukiah Municipal Airport (37.9 miles)

  • Lowest 6 September, 2026

    45.6 °F

  • Average September

    64.2 °F

  • Highest 7 September, 2026

    90 °F

Climate (2021–2026)

Ukiah Municipal Airport (37.9 miles)

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  • Average Low 2021–2026

    47.1 °F

  • Average 2021–2026

    61 °F

  • Average High 2021–2026

    76.1 °F
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