Grass Lake Weather Forecast

    • 60
    • 83

    Decreasing Clouds

    • 61
    • 81

    Mostly Cloudy

    • 63
    • 79

    Rain Showers

    • 60
    • 81

    Chance Rain Showers

    • 50
    • 78

    Partly Sunny

    • 48
    • 74

    Partly Sunny

Today 5 Sep Washburn

Mostly cloudy in the Morning, then becoming partly sunny. Areas of fog in the morning. Hot with Highs in the mid 80s. Northeast Winds around 5 Mph.

Tonight 5 Sep Washburn

Partly cloudy. Humid with Lows around 60. East Winds around 5 Mph.

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Grass Lake Temperature Statistics

September Temperature

Siren, Burnett County Airport (19.3 miles)

  • Lowest 1 September, 2026

    52.2 °F

  • Average September

    70.5 °F

  • Highest 1 September, 2026

    85.5 °F

Climate (2021–2026)

Siren, Burnett County Airport (19.3 miles)

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  • Average Low 2021–2026

    33 °F

  • Average 2021–2026

    44 °F

  • Average High 2021–2026

    53.9 °F
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