Sylvan Lake Weather Forecast

    • 57
    • 83

    Chance Thunderstorms

    • 51
    • 70

    Patchy Smoke

    • 55
    • 77

    Mostly Sunny

    • 60
    • 82

    Mostly Sunny

    • 57
    • 81

    Partly Sunny

    • 51
    • 73

    Mostly Sunny

    • 49
    • 72

    Mostly Sunny

Today 22 Aug Kootenai/Cabinet Region

Mostly cloudy. Slight chance of rain until late Afternoon, then slight chance of Showers and Thunderstorms late in the afternoon. Patchy smoke in the morning. Chance of precipitation 20 percent. Hot. Some Thunderstorms may produce gusty Winds. Highs in the 90s.

Tonight 22 Aug Kootenai/Cabinet Region

Mostly cloudy. Chance of rain Showers through the night. Chance of Thunderstorms in the Evening, then slight chance of Thunderstorms after midnight. Patchy smoke in the evening. Chance of precipitation 50 percent. Some Thunderstorms may produce gusty Winds. Lows in the 50s.

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Sylvan Lake Temperature Statistics

August Temperature

Mullan Pass, Mullan Pass Vor (36 miles)

  • Lowest 2 August, 2026

    42.1 °F

  • Average August

    62.2 °F

  • Highest 20 August, 2026

    82 °F

Climate (2021–2026)

Mullan Pass, Mullan Pass Vor (36 miles)

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  • Average Low 2021–2026

    33.7 °F

  • Average 2021–2026

    39.7 °F

  • Average High 2021–2026

    46 °F
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