South Mountain Reservoir Weather Forecast

    • 54
    • 86

    Slight Chance Thunderstorms

    • 51
    • 83

    Mostly Sunny

    • 51
    • 86

    Sunny

    • 51
    • 84

    Sunny

    • 52
    • 86

    Mostly Sunny

    • 52
    • 87

    Mostly Sunny

Today 5 Jul Modoc County

Partly cloudy in the Morning, then mostly cloudy with a slight chance of Thunderstorms in the afternoon. Highs in the lower to mid 80s. West Winds 10 to 15 Mph.

Tonight 5 Jul Modoc County

Mostly cloudy. Slight chance of dry Thunderstorms. Lows in the mid 50s to lower 60s. West Winds 10 to 15 Mph shifting to the south 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

    61.5 °F

  • Highest 2 July, 2026

    82 °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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