Graven Reservoir Weather Forecast

    • 47
    • 77

    Partly Sunny

    • 43
    • 75

    Mostly Sunny

    • 45
    • 76

    Partly Sunny

    • 46
    • 77

    Partly Sunny

    • 36
    • 65

    Partly Sunny

    • 39
    • 67

    Partly Sunny

    • 36
    • 63

    Mostly Sunny

Today 21 Sep Modoc County

Mostly clear. Lows in the mid 30s to lower 40s. Highs in the lower to mid 60s.

Tonight 21 Sep Modoc County

Mostly clear early this evening then becoming partly cloudy. Lows in the mid 40s to lower 50s. Northwest Winds around 5 Mph.

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Graven Reservoir Temperature Statistics

September Temperature

Alturas (14.9 miles)

  • Lowest 14 September, 2026

    28.7 °F

  • Average September

    58.3 °F

  • Highest 10 September, 2026

    85.6 °F

Climate (2021–2026)

Alturas (14.9 miles)

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  • Average Low 2021–2026

    33.2 °F

  • Average 2021–2026

    49.1 °F

  • Average High 2021–2026

    64.7 °F
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