Grassy Lake Weather Forecast

    • 49
    • 65

    Mostly Sunny

    • 48
    • 61

    Mostly Sunny

    • 52
    • 68

    Sunny

    • 53
    • 70

    Sunny

    • 52
    • 69

    Sunny

    • 52
    • 68

    Mostly Sunny

Today 13 Sep Western Plumas County/Lassen Park

Sunny. Highs 62 to 77 higher Elevations. 68 to 83 lower Elevations. Light Winds becoming southwest up to 10 Mph in the afternoon.

Tonight 13 Sep Western Plumas County/Lassen Park

Mostly clear. Lows 44 to 59. Prevailing southwest Winds up to 10 Mph in the evening becoming light.

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Grassy Lake Temperature Statistics

September Temperature

Chico Municipal Airport (29.2 miles)

  • Lowest 5 September, 2025

    62.6 °F

  • Average September

    74.8 °F

  • Highest 1 September, 2025

    102.2 °F

Climate (2020–Present)

Chico Municipal Airport (29.2 miles)

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  • Average Low 2020–2025

    52.3 °F

  • Average 2020–2025

    61.2 °F

  • Average High 2020–2025

    75.4 °F
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