South Mountain Reservoir Weather Forecast

    • 54
    • 93

    Smoke

    • 53
    • 91

    Smoke

    • 53
    • 90

    Sunny

    • 53
    • 88

    Sunny

    • 52
    • 86

    Mostly Sunny

    • 52
    • 85

    Partly Sunny

Today 8 Aug Modoc County

Sunny. Smoke this Morning, then Areas of smoke early this afternoon. Haze and patchy smoke late this afternoon. Highs 90 to 100. East Winds around 5 Mph shifting to the west 10 to 15 Mph in the late morning and afternoon.

Tonight 8 Aug Modoc County

Clear. Haze in the evening. Smoke through the night. Lows in the mid 50s to lower 60s. 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

August Temperature

Alturas (22.4 miles)

  • Lowest 4 August, 2026

    43.6 °F

  • Average August

    75.8 °F

  • Highest 6 August, 2026

    98.1 °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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