South Mountain Reservoir Weather Forecast

    • 31
    • 55

    Partly Sunny

    • 34
    • 57

    Mostly Cloudy

    • 28
    • 53

    Partly Sunny

    • 29
    • 52

    Mostly Sunny

    • 30
    • 57

    Mostly Sunny

    • 32
    • 61

    Mostly Sunny

Today 30 Jan Modoc County

Mostly cloudy this morning then becoming partly cloudy. Highs in the lower 50s to lower 60s. South Winds 5 to 10 Mph.

Tonight 30 Jan Modoc County

Partly cloudy. Lows in the lower to mid 30s. Southeast Winds 5 to 10 Mph.

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South Mountain Reservoir Temperature Statistics

January Temperature

Alturas (22.4 miles)

  • Lowest 9 January, 2026

    4.6 °F

  • Average January

    36 °F

  • Highest 14 January, 2026

    60.7 °F

Climate (2021–Present)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.4 °F

  • Average 2021–2026

    49.5 °F

  • Average High 2021–2026

    64.6 °F
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