South Mountain Reservoir Weather Forecast

    • 57
    • 85

    Decreasing Clouds

    • 58
    • 86

    Patchy Smoke

    • 56
    • 88

    Slight Chance Thunderstorms

    • 52
    • 88

    Sunny

    • 52
    • 87

    Sunny

    • 51
    • 87

    Sunny

    • 51
    • 87

    Mostly Sunny

Today 20 Jul Modoc County

Partly cloudy. Patchy smoke early this afternoon. Highs in the lower 80s to lower 90s. West Winds 5 to 10 Mph.

Tonight 20 Jul Modoc County

Partly cloudy. Patchy smoke well after midnight. Lows in the mid 50s to lower 60s. West Winds 10 to 15 Mph shifting to the southwest around 5 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Mountain Reservoir Temperature Statistics

July Temperature

Alturas (22.4 miles)

  • Lowest 1 July, 2026

    38.6 °F

  • Average July

    69.2 °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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