South Mountain Reservoir Weather Forecast

    • 38
    • 62

    Mostly Sunny

    • 39
    • 66

    Mostly Sunny

    • 44
    • 71

    Partly Sunny

    • 44
    • 70

    Slight Chance Rain

    • 41
    • 69

    Rain Likely

    • 40
    • 56

    Rain Showers

    • 39
    • 60

    Chance Rain

Today 29 Apr Modoc County

Sunny. Highs in the lower to mid 60s. Northeast Winds around 5 Mph shifting to the northwest in the late morning and afternoon.

Tonight 29 Apr Modoc County

Mostly clear. Lows in the mid 30s to lower 40s. North Winds 5 to 10 Mph shifting to the northeast well after midnight.

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South Mountain Reservoir Temperature Statistics

April Temperature

Alturas (22.4 miles)

  • Lowest 17 April, 2026

    13.6 °F

  • Average April

    44.9 °F

  • Highest 5 April, 2026

    73.7 °F

Climate (2021–Present)

Alturas (22.4 miles)

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  • Average Low 2021–2026

    33.5 °F

  • Average 2021–2026

    49.7 °F

  • Average High 2021–2026

    64.9 °F
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