Crystal Lake Weather Forecast

    • 52
    • 75

    Chance Rain Showers

    • 50
    • 59

    Chance Rain Showers

    • 51
    • 64

    Slight Chance Rain Showers

    • 52
    • 67

    Sunny

    • 54
    • 72

    Mostly Sunny

    • 52
    • 70

    Chance Rain Showers

Today 18 Sep Western Plumas County/Lassen Park

Mostly cloudy. Highs 69 to 84 higher Elevations. 75 to 90 lower Elevations. Light Winds becoming southwest up to 10 Mph in the afternoon.

Tonight 18 Sep Western Plumas County/Lassen Park

Mostly cloudy. A slight chance of rain Showers after midnight. Cooler. Lows 48 to 63. Prevailing southwest Winds up to 10 Mph in the evening becoming light.

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Crystal Lake Temperature Statistics

September Temperature

Emigrant Gap, Blue Canyon Nyack Airport (54.1 miles)

  • Lowest 10 September, 2025

    46.9 °F

  • Average September

    63.6 °F

  • Highest 2 September, 2025

    84 °F

Climate (2020–Present)

Emigrant Gap, Blue Canyon Nyack Airport (54.1 miles)

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  • Average Low 2020–2025

    46.7 °F

  • Average 2020–2025

    53.4 °F

  • Average High 2020–2025

    60.5 °F
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