South Mountain Reservoir Weather Forecast

    • 50
    • 84

    Mostly Sunny

    • 48
    • 84

    Sunny

    • 49
    • 85

    Sunny

    • 50
    • 85

    Sunny

    • 51
    • 88

    Sunny

    • 52
    • 89

    Mostly Sunny

Today 25 Jul Modoc County

Sunny. Highs in the lower to mid 80s. Southwest Winds 15 to 20 Mph with Gusts to around 35 Mph.

Tonight 25 Jul Modoc County

Mostly clear. Lows around 50. 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

    69.9 °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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