Alta Sierra Weather Forecast

    • 54
    • 78

    Becoming Sunny

    • 56
    • 79

    Sunny

    • 59
    • 85

    Mostly Sunny

    • 60
    • 88

    Partly Sunny

    • 55
    • 79

    Mostly Sunny

    • 55
    • 78

    Mostly Sunny

Today 21 Sep Northern Motherlode Between 1000-3000 ft

Mostly sunny. Highs 76 to 82. Light Winds becoming southwest up to 10 Mph in the afternoon.

Tonight 21 Sep Northern Motherlode Between 1000-3000 ft

Mostly clear. Lows 53 to 59. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Alta Sierra Temperature Statistics

September Temperature

Nevada County Air Park (6.2 miles)

  • Lowest 17 September, 2026

    46.4 °F

  • Average September

    66.1 °F

  • Highest 9 September, 2026

    91.4 °F

Climate (2021–2026)

Nevada County Air Park (6.2 miles)

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  • Average Low 2021–2026

    52.1 °F

  • Average 2021–2026

    60.1 °F

  • Average High 2021–2026

    68.4 °F
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