South Mountain Reservoir Weather Forecast

    • 55
    • 93

    Patchy Smoke

    • 56
    • 93

    Sunny

    • 58
    • 94

    Mostly Sunny

    • 56
    • 93

    Sunny

    • 54
    • 91

    Sunny

    • 53
    • 89

    Mostly Sunny

Today 5 Aug Modoc County

Sunny. Patchy smoke early this morning. Highs in the lower to mid 90s. South Winds around 5 Mph shifting to the southwest 10 to 15 Mph this afternoon.

Tonight 5 Aug Modoc County

Clear. Lows in the mid 50s to lower 60s. Southwest Winds 10 to 15 Mph shifting to the south around 5 Mph well after midnight.

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South Mountain Reservoir Temperature Statistics

August Temperature

Alturas (22.4 miles)

  • Lowest 1 August, 2026

    46.7 °F

  • Average August

    70.7 °F

  • Highest 1 August, 2026

    95.6 °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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