South Mountain Reservoir Weather Forecast

    • 52
    • 87

    Sunny

    • 54
    • 88

    Partly Sunny

    • 56
    • 87

    Mostly Cloudy

    • 54
    • 83

    Partly Sunny

    • 54
    • 86

    Mostly Sunny

    • 54
    • 89

    Mostly Sunny

Today 10 Jul Modoc County

Sunny. Highs in the mid 80s to lower 90s. Light Winds becoming southwest 15 to 20 Mph with Gusts to around 35 Mph in the late morning and afternoon.

Tonight 10 Jul Modoc County

Clear. Lows in the lower to mid 50s. Southwest Winds 10 to 20 Mph with Gusts to around 35 Mph becoming south around 5 Mph 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

    68 °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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