South Mountain Reservoir Weather Forecast

    • 48
    • 76

    Sunny

    • 53
    • 82

    Sunny

    • 50
    • 80

    Sunny

    • 52
    • 85

    Sunny

    • 54
    • 87

    Mostly Sunny

    • 54
    • 88

    Mostly Sunny

Today 11 Jun Modoc County

Sunny. Highs in the mid 70s to lower 80s. North Winds 5 to 10 Mph.

Tonight 11 Jun Modoc County

Clear. Lows in the mid 40s to lower 50s. North Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Mountain Reservoir Temperature Statistics

June Temperature

Alturas (22.4 miles)

  • Lowest 8 June, 2026

    35.7 °F

  • Average June

    58.7 °F

  • Highest 2 June, 2026

    83.6 °F

Climate (2021–Present)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.5 °F

  • Average 2021–2026

    49.6 °F

  • Average High 2021–2026

    64.9 °F
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