South Mountain Reservoir Weather Forecast

    • 50
    • 83

    Becoming Sunny

    • 51
    • 86

    Sunny

    • 50
    • 84

    Sunny

    • 52
    • 86

    Sunny

    • 51
    • 87

    Mostly Sunny

    • 52
    • 87

    Partly Sunny

Today 6 Jul Modoc County

Sunny until early afternoon then becoming partly cloudy. Highs in the lower to mid 80s. Southwest Winds 5 to 10 Mph increasing to 10 to 15 Mph late this afternoon.

Tonight 6 Jul Modoc County

Mostly clear. Slight chance of Thunderstorms in the evening. Lows in the lower to mid 50s. Southwest Winds 10 to 15 Mph shifting to the south around 5 Mph after midnight.

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South Mountain Reservoir Temperature Statistics

July Temperature

Alturas (22.4 miles)

  • Lowest 1 July, 2026

    38.6 °F

  • Average July

    63.5 °F

  • Highest 3 July, 2026

    87.1 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.4 °F

  • Average 2021–2026

    49.4 °F

  • Average High 2021–2026

    64.8 °F
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