Grass Lake Weather Forecast

    • 46
    • 66

    Sunny

    • 45
    • 65

    Sunny

    • 43
    • 59

    Sunny

    • 44
    • 58

    Sunny

    • 48
    • 66

    Mostly Sunny

    • 49
    • 68

    Mostly Sunny

Today 14 Sep Lassen-Eastern Plumas-Eastern Sierra Counties

Sunny. Highs 67 to 77. East Winds 10 to 15 Mph.

Tonight 14 Sep Lassen-Eastern Plumas-Eastern Sierra Counties

Clear. Lows 36 to 46. Light Winds.

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  • Temperature Real-Time

Grass Lake Temperature Statistics

September Temperature

Emigrant Gap, Blue Canyon Nyack Airport (31.1 miles)

  • Lowest 1 September, 2026

    43.6 °F

  • Average September

    60 °F

  • Highest 9 September, 2026

    84.7 °F

Climate (2021–2026)

Emigrant Gap, Blue Canyon Nyack Airport (31.1 miles)

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  • Average Low 2021–2026

    46.7 °F

  • Average 2021–2026

    53.4 °F

  • Average High 2021–2026

    60.4 °F
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