South Mountain Reservoir Weather Forecast

    • 42
    • 61

    Rain Likely

    • 38
    • 66

    Mostly Sunny

    • 43
    • 72

    Sunny

    • 46
    • 78

    Sunny

    • 48
    • 80

    Sunny

    • 50
    • 80

    Sunny

Today 8 Jun Modoc County

Mostly cloudy. A 10 percent chance of rain this afternoon. Highs in the lower to mid 60s. South Winds around 5 Mph increasing to southwest 10 to 20 Mph in the late morning and afternoon.

Tonight 8 Jun Modoc County

Mostly cloudy with a 10 percent chance of rain. Lows in the lower to mid 40s. Southwest Winds 10 to 20 Mph.

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South Mountain Reservoir Temperature Statistics

June Temperature

Alturas (22.4 miles)

  • Lowest 1 June, 2026

    37.7 °F

  • Average June

    62.3 °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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