South Mountain Reservoir Weather Forecast

    • 59
    • 89

    Mostly Cloudy

    • 57
    • 84

    Mostly Cloudy

    • 57
    • 86

    Mostly Cloudy

    • 55
    • 88

    Slight Chance Thunderstorms

    • 52
    • 88

    Mostly Sunny

    • 51
    • 86

    Mostly Sunny

    • 51
    • 86

    Mostly Sunny

Today 19 Jul Modoc County

Partly cloudy this morning then becoming mostly cloudy. Smoke early this morning. Patchy smoke in the late morning and early afternoon. Highs in the mid 80s to lower 90s. South Winds 5 to 10 Mph shifting to the southwest late this afternoon.

Tonight 19 Jul Modoc County

Mostly cloudy. Lows in the lower to mid 60s. West Winds 10 to 15 Mph shifting to the northwest around 5 Mph well 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

    69.4 °F

  • Highest 11 July, 2026

    95.6 °F

Climate (2021–2026)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.4 °F

  • Average 2021–2026

    49.3 °F

  • Average High 2021–2026

    64.7 °F
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