South Mountain Reservoir Weather Forecast

    • 30
    • 38

    Snow

    • 31
    • 39

    Chance Rain/Snow

    • 24
    • 38

    Snow Likely

    • 21
    • 35

    Chance Snow

    • 23
    • 39

    Partly Sunny

    • 25
    • 44

    Mostly Sunny

Today 5 Jan Modoc County

Snow likely in the Morning, then chance of rain and snow in the afternoon. Snow level 4200 feet. Snow accumulation up to 1 inch except 3 to 4 Inches in the warner Mountains. Highs in the mid 30s to lower 40s. South Winds 10 to 15 Mph. Chance of precipitation 60 percent.

Tonight 5 Jan Modoc County

Mostly cloudy. Chance of rain and snow in the evening. Snow level 4500 feet. Little or no snow accumulation except snow accumulation up to 1 inch in the warner Mountains. Lows around 30. South Winds 10 to 15 Mph. Chance of precipitation 30 percent.

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South Mountain Reservoir Temperature Statistics

January Temperature

Alturas (22.4 miles)

  • Lowest 1 January, 2026

    37.9 °F

  • Average January

    43.7 °F

  • Highest 2 January, 2026

    51.1 °F

Climate (2021–Present)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.5 °F

  • Average 2021–2026

    49.4 °F

  • Average High 2021–2026

    64.5 °F
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