South Mountain Reservoir Weather Forecast

    • 52
    • 85

    Areas Smoke

    • 52
    • 88

    Sunny

    • 52
    • 89

    Sunny

    • 54
    • 92

    Sunny

    • 51
    • 90

    Mostly Sunny

    • 51
    • 87

    Sunny

Today 28 Jul Modoc County

Sunny. Patchy smoke until early afternoon. Highs in the mid 80s to lower 90s. West Winds 10 to 15 Mph.

Tonight 28 Jul Modoc County

Clear. Smoke after midnight. Lows in the lower to mid 50s. Northwest Winds 10 to 15 Mph shifting to the north 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

    70.1 °F

  • Highest 24 July, 2026

    97.6 °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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