Sylvan Lake Weather Forecast

    • 47
    • 57

    Chance Rain

    • 50
    • 72

    Mostly Sunny

    • 52
    • 77

    Sunny

    • 52
    • 76

    Partly Sunny

    • 51
    • 74

    Partly Sunny

    • 51
    • 72

    Slight Chance Rain

Today 15 Sep Kootenai/Cabinet Region

Mostly cloudy. A chance of rain in the Morning, then chance of rain Showers and a slight chance of Thunderstorms in the afternoon. Areas of fog in the morning. Chance of precipitation 50 percent. Highs in the mid 60s to lower 70s.

Tonight 15 Sep Kootenai/Cabinet Region

Partly cloudy. A 20 percent chance of rain in the evening. Patchy fog after midnight. Lows in the 40s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sylvan Lake Temperature Statistics

September Temperature

Mullan Pass, Mullan Pass Vor (36 miles)

  • Lowest 11 September, 2025

    46.9 °F

  • Average September

    63.8 °F

  • Highest 2 September, 2025

    84 °F

Climate (2020–Present)

Mullan Pass, Mullan Pass Vor (36 miles)

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  • Average Low 2020–2025

    33.7 °F

  • Average 2020–2025

    39.7 °F

  • Average High 2020–2025

    46.1 °F
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