South Mountain Reservoir Weather Forecast

    • 45
    • 77

    Decreasing Clouds

    • 46
    • 77

    Mostly Sunny

    • 38
    • 73

    Breezy

    • 34
    • 55

    Chance Snow

    • 37
    • 56

    Chance Rain

    • 40
    • 63

    Chance Rain

    • 40
    • 66

    Chance Rain Showers

Today 23 May Modoc County

Sunny early this afternoon then becoming partly cloudy. Highs in the mid 70s to lower 80s. West Winds 10 to 15 Mph.

Tonight 23 May Modoc County

Partly cloudy this evening then clearing. Lows in the mid 40s to lower 50s. Southwest Winds 10 to 15 Mph shifting to the south around 5 Mph well after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Mountain Reservoir Temperature Statistics

May Temperature

Alturas (22.4 miles)

  • Lowest 19 May, 2026

    27.6 °F

  • Average May

    56.1 °F

  • Highest 12 May, 2026

    88.6 °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

    65 °F
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