South Mountain Reservoir Weather Forecast

    • 28
    • 47

    Slight Chance Rain/Snow

    • 32
    • 59

    Mostly Sunny

    • 35
    • 62

    Mostly Sunny

    • 34
    • 57

    Rain/Snow Likely

    • 33
    • 48

    Rain/Snow Likely

    • 32
    • 52

    Chance Rain

    • 36
    • 57

    Chance Rain

Today 22 Apr Modoc County

Mostly cloudy with a 30 percent chance of rain and snow. Snow level 4300 feet this morning. Snow accumulation up to 1 inch except 3 to 5 Inches in the warner Mountains. Highs in the mid 40s to lower 50s. West Winds 10 to 20 Mph.

Tonight 22 Apr Modoc County

Mostly cloudy. Lows in the mid 20s to lower 30s. West Winds 10 to 20 Mph decreasing to 5 to 10 Mph after midnight.

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South Mountain Reservoir Temperature Statistics

April Temperature

Alturas (22.4 miles)

  • Lowest 17 April, 2026

    13.6 °F

  • Average April

    44.9 °F

  • Highest 5 April, 2026

    73.7 °F

Climate (2021–Present)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.5 °F

  • Average 2021–2026

    49.6 °F

  • Average High 2021–2026

    64.9 °F
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