South Mountain Reservoir Weather Forecast

    • 54
    • 88

    Mostly Sunny

    • 54
    • 87

    Partly Sunny

    • 51
    • 84

    Mostly Sunny

    • 51
    • 85

    Mostly Sunny

    • 51
    • 84

    Mostly Sunny

    • 52
    • 85

    Mostly Sunny

Today 4 Jul Modoc County

Sunny. Highs in the mid 80s to lower 90s. West Winds around 5 Mph increasing to 10 to 15 Mph.

Tonight 4 Jul Modoc County

Mostly clear. Lows in the mid 50s. West Winds 10 to 15 Mph.

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  • Temperature Real-Time

South Mountain Reservoir Temperature Statistics

July Temperature

Alturas (22.4 miles)

  • Lowest 1 July, 2026

    37.9 °F

  • Average July

    60 °F

  • Highest 1 July, 2026

    77 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.4 °F

  • Average 2021–2026

    49.4 °F

  • Average High 2021–2026

    64.8 °F
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