South Mountain Reservoir Weather Forecast

    • 51
    • 89

    Sunny

    • 49
    • 84

    Mostly Sunny

    • 48
    • 84

    Sunny

    • 49
    • 85

    Sunny

    • 50
    • 85

    Sunny

    • 51
    • 88

    Sunny

Today 24 Jul Modoc County

Sunny. Highs in the mid 80s to lower 90s. South Winds 5 to 10 Mph shifting to the southwest 10 to 20 Mph in the afternoon.

Tonight 24 Jul Modoc County

Mostly clear. Lows in the lower to mid 50s. Southwest Winds 15 to 20 Mph decreasing to 5 to 10 Mph in the late evening and early Morning, then shifting to the south well after midnight.

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South Mountain Reservoir Temperature Statistics

July Temperature

Alturas (22.4 miles)

  • Lowest 1 July, 2026

    38.6 °F

  • Average July

    69.3 °F

  • Highest 11 July, 2026

    95.6 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.4 °F

  • Average 2021–2026

    49.3 °F

  • Average High 2021–2026

    64.7 °F
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