Trillium Lake Weather Forecast

    • 61
    • 80

    Chance Thunderstorms

    • 58
    • 83

    Slight Chance Thunderstorms

    • 57
    • 78

    Chance Thunderstorms

    • 53
    • 71

    Chance Rain Showers

    • 53
    • 68

    Chance Rain Showers

    • 54
    • 70

    Chance Rain Showers

Today 15 Sep North Cass

Mostly cloudy with a slight chance of Showers this Morning, then mostly sunny with a chance of Showers and Thunderstorms this afternoon. Highs in the upper 70s. South Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 40 percent.

Tonight 15 Sep North Cass

Mostly clear. A slight chance of Showers in the evening. Humid with Lows in the lower 60s. South Winds 5 to 10 Mph. Chance of rain 20 percent.

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Trillium Lake Temperature Statistics

September Temperature

Longville, Longville Municipal Airport (9.3 miles)

  • Lowest 7 September, 2025

    35.6 °F

  • Average September

    56.4 °F

  • Highest 13 September, 2025

    80.6 °F

Climate (2020–Present)

Longville, Longville Municipal Airport (9.3 miles)

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  • Average Low 2020–2025

    31.5 °F

  • Average 2020–2025

    41.8 °F

  • Average High 2020–2025

    51.4 °F
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