Trillium Lake Weather Forecast

    • 50
    • 64

    Increasing Clouds

    • 52
    • 60

    Rain Showers

    • 52
    • 66

    Cloudy

    • 52
    • 63

    Chance Rain Showers

    • 50
    • 69

    Chance Rain Showers

    • 48
    • 66

    Chance Rain Showers

Today 23 Sep North Cass

Mostly sunny. Highs in the mid 60s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 23 Sep North Cass

Mostly cloudy. Showers likely with a slight chance of Thunderstorms after midnight. Not as cool with Lows in the lower 50s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Trillium Lake Temperature Statistics

September Temperature

Longville, Longville Municipal Airport (9.3 miles)

  • Lowest 14 September, 2026

    35.4 °F

  • Average September

    61.7 °F

  • Highest 3 September, 2026

    84 °F

Climate (2021–2026)

Longville, Longville Municipal Airport (9.3 miles)

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  • Average Low 2021–2026

    31.3 °F

  • Average 2021–2026

    41.6 °F

  • Average High 2021–2026

    51.2 °F
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