South Mountain Reservoir Weather Forecast

    • 51
    • 85

    Areas Smoke

    • 53
    • 91

    Patchy Smoke

    • 55
    • 93

    Sunny

    • 56
    • 93

    Sunny

    • 57
    • 93

    Mostly Sunny

    • 54
    • 91

    Sunny

Today 3 Aug Modoc County

Sunny. Areas of smoke this Morning, then patchy smoke this afternoon. Highs in the lower 80s to lower 90s. Northeast Winds 10 to 15 Mph.

Tonight 3 Aug Modoc County

Clear. Patchy smoke in the evening. Lows in the lower to mid 50s. Northeast Winds 10 to 15 Mph.

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South Mountain Reservoir Temperature Statistics

August Temperature

Alturas (22.4 miles)

  • Lowest 1 August, 2026

    48.9 °F

  • Average August

    80.7 °F

  • Highest 1 August, 2026

    93.9 °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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