South Mountain Reservoir Weather Forecast

    • 51
    • 87

    Sunny

    • 51
    • 85

    Sunny

    • 52
    • 86

    Sunny

    • 51
    • 88

    Mostly Sunny

    • 53
    • 88

    Partly Sunny

    • 54
    • 87

    Partly Sunny

Today 7 Jul Modoc County

Sunny. Highs in the lower 80s to lower 90s. Light Winds becoming southwest around 5 Mph late this Morning, then increasing to 10 to 15 Mph this afternoon.

Tonight 7 Jul Modoc County

Clear. Lows in the lower to mid 50s. Southwest Winds 10 to 15 Mph shifting to the west around 5 Mph 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

    65.8 °F

  • Highest 4 July, 2026

    93 °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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