South Mountain Reservoir Weather Forecast

    • 53
    • 85

    Sunny

    • 54
    • 88

    Mostly Sunny

    • 52
    • 89

    Sunny

    • 53
    • 87

    Sunny

    • 54
    • 88

    Mostly Sunny

    • 50
    • 81

    Slight Chance Rain Showers

Today 14 Jun Modoc County

Sunny. Highs in the lower 80s to lower 90s. North Winds 5 to 10 Mph.

Tonight 14 Jun Modoc County

Clear. Lows in the lower to mid 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 10 June, 2026

    33.7 °F

  • Average June

    59.9 °F

  • Highest 12 June, 2026

    87.1 °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

    65 °F
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