South Mountain Reservoir Weather Forecast

    • 50
    • 85

    Areas Smoke

    • 49
    • 81

    Patchy Smoke

    • 47
    • 79

    Mostly Sunny

    • 46
    • 80

    Partly Sunny

    • 48
    • 81

    Partly Sunny

    • 49
    • 81

    Partly Sunny

    • 48
    • 78

    Partly Sunny

Today 12 Aug Modoc County

Sunny. Patchy smoke until early afternoon. Highs in the lower 80s to lower 90s. Northeast Winds around 5 Mph shifting to the southwest 10 to 15 Mph in the late morning and afternoon.

Tonight 12 Aug Modoc County

Partly cloudy. Patchy smoke. Lows in the lower to mid 50s. West Winds 10 to 15 Mph decreasing to around 5 Mph well after midnight.

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South Mountain Reservoir Temperature Statistics

August Temperature

Alturas (22.4 miles)

  • Lowest 4 August, 2026

    43.6 °F

  • Average August

    72.9 °F

  • Highest 7 August, 2026

    101.6 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.3 °F

  • Average 2021–2026

    49.3 °F

  • Average High 2021–2026

    64.8 °F
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