South Mountain Reservoir Weather Forecast

    • 52
    • 86

    Mostly Sunny

    • 52
    • 86

    Mostly Sunny

    • 52
    • 88

    Sunny

    • 53
    • 88

    Partly Sunny

    • 54
    • 87

    Mostly Cloudy

    • 54
    • 86

    Partly Sunny

Today 8 Jul Modoc County

Sunny. Highs in the mid 80s to lower 90s. West Winds around 5 Mph shifting to the north late this Morning, then shifting to the west 10 to 15 Mph this afternoon.

Tonight 8 Jul Modoc County

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

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South Mountain Reservoir Temperature Statistics

July Temperature

Alturas (22.4 miles)

  • Lowest 1 July, 2026

    38.6 °F

  • Average July

    66.8 °F

  • Highest 4 July, 2026

    93.7 °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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