Boulder Reservoir Weather Forecast

    • 47
    • 74

    Decreasing Clouds

    • 50
    • 77

    Mostly Sunny

    • 49
    • 78

    Partly Sunny

    • 41
    • 68

    Breezy

    • 43
    • 68

    Partly Sunny

    • 39
    • 66

    Mostly Sunny

Today 22 Sep Northern Washoe County

Partly cloudy. Slight chance of Showers and Thunderstorms in the afternoon. Highs 77 to 87. Light Winds becoming southwest around 10 Mph in the afternoon.

Tonight 22 Sep Northern Washoe County

Partly cloudy in the evening then clearing. Lows 45 to 55. West Winds around 10 Mph in the evening becoming light.

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Boulder Reservoir Temperature Statistics

September Temperature

Alturas (42.9 miles)

  • Lowest 14 September, 2026

    28.7 °F

  • Average September

    58.3 °F

  • Highest 10 September, 2026

    85.6 °F

Climate (2021–2026)

Alturas (42.9 miles)

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  • Average Low 2021–2026

    33.2 °F

  • Average 2021–2026

    49.1 °F

  • Average High 2021–2026

    64.7 °F
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