South Mountain Reservoir Weather Forecast

    • 56
    • 85

    Increasing Clouds

    • 55
    • 82

    Mostly Cloudy

    • 53
    • 84

    Chance Rain Showers

    • 51
    • 87

    Sunny

    • 51
    • 87

    Mostly Sunny

    • 54
    • 89

    Partly Sunny

Today 12 Jul Modoc County

Mostly cloudy. Patchy smoke early this morning. Highs in the lower to mid 80s. Southeast Winds around 5 Mph shifting to the southwest 10 to 15 Mph with Gusts to around 30 Mph early this Afternoon, then increasing to around 20 Mph late this afternoon.

Tonight 12 Jul Modoc County

Mostly cloudy. Lows in the mid 50s to lower 60s. Southwest Winds around 20 Mph shifting to the west 10 to 15 Mph in the late evening and early Morning, then 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

    68.2 °F

  • Highest 4 July, 2026

    93.7 °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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