Boulder Reservoir Weather Forecast

    • 44
    • 70

    Increasing Clouds

    • 43
    • 66

    Slight Chance Thunderstorms

    • 46
    • 70

    Mostly Sunny

    • 49
    • 74

    Mostly Sunny

    • 51
    • 77

    Partly Sunny

    • 49
    • 77

    Mostly Sunny

Today 16 Sep Northern Washoe County

Mostly sunny. Slight chance of Showers in the afternoon. Highs 71 to 81. North Winds around 10 Mph shifting to the southeast in the afternoon.

Tonight 16 Sep Northern Washoe County

Partly cloudy in the Evening, then mostly cloudy with a chance of Showers after midnight. Lows 41 to 51. West Winds 10 to 15 Mph.

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Boulder Reservoir Temperature Statistics

September Temperature

Alturas (42.9 miles)

  • Lowest 13 September, 2026

    36 °F

  • Average September

    61.5 °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

    64.6 °F
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