South Mountain Reservoir Weather Forecast

    • 52
    • 90

    Smoke

    • 51
    • 89

    Mostly Sunny

    • 52
    • 86

    Mostly Sunny

    • 50
    • 81

    Slight Chance Rain Showers

    • 49
    • 80

    Chance Rain Showers

    • 49
    • 80

    Chance Rain Showers

Today 10 Aug Modoc County

Sunny. Areas of smoke early this Morning, then patchy smoke in the late morning and afternoon. Highs in the mid 80s to mid 90s. Northeast Winds around 5 Mph shifting to the west 10 to 15 Mph this afternoon.

Tonight 10 Aug Modoc County

Mostly clear. Patchy smoke. Lows in the lower 50s to lower 60s. West Winds 10 to 15 Mph shifting to the northwest around 5 Mph after Midnight, then shifting to the north 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

    73.5 °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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