South Mountain Reservoir Weather Forecast

    • 49
    • 84

    Sunny

    • 49
    • 84

    Sunny

    • 50
    • 84

    Sunny

    • 52
    • 88

    Sunny

    • 52
    • 89

    Mostly Sunny

    • 52
    • 91

    Mostly Sunny

Today 26 Jul Modoc County

Sunny. Highs in the lower to mid 80s. South Winds 5 to 10 Mph shifting to the southwest 10 to 15 Mph with Gusts to around 30 Mph in the afternoon.

Tonight 26 Jul Modoc County

Clear. Lows around 50. Southwest Winds 10 to 15 Mph with Gusts to around 30 Mph shifting to the west around 5 Mph after Midnight, then becoming light 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

    70.1 °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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