South Mountain Reservoir Weather Forecast

    • 33
    • 56

    Decreasing Clouds

    • 28
    • 49

    Partly Sunny

    • 27
    • 51

    Partly Sunny

    • 32
    • 58

    Mostly Sunny

    • 34
    • 62

    Mostly Sunny

    • 37
    • 68

    Mostly Sunny

Today 10 Oct Modoc County

Partly cloudy until early afternoon then becoming mostly cloudy. Patchy frost early this morning. Highs in the mid 50s to lower 60s. Northwest Winds 5 to 10 Mph.

Tonight 10 Oct Modoc County

Mostly cloudy in the evening then becoming partly cloudy. Lows in the lower to mid 30s. Northeast Winds 10 to 15 Mph.

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South Mountain Reservoir Temperature Statistics

October Temperature

Alturas (22.4 miles)

  • Lowest 1 October, 2026

    34.6 °F

  • Average October

    64.9 °F

  • Highest 3 October, 2026

    89.7 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.3 °F

  • Average 2021–2026

    49.2 °F

  • Average High 2021–2026

    64.8 °F
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