Flathead Lake State Park - Yellow Bay Unit Weather Forecast

    • 57
    • 78

    Increasing Clouds

    • 56
    • 70

    Rain Showers Likely

    • 57
    • 72

    Chance Rain Showers

    • 58
    • 76

    Partly Sunny

    • 60
    • 78

    Partly Sunny

    • 60
    • 78

    Partly Sunny

Today 12 Aug Flathead/Mission Valleys

Partly cloudy in the morning then becoming mostly sunny. Patchy smoke through the day. A 30 percent chance of Showers and Thunderstorms in the afternoon. Highs in the upper 70s to mid 80s. Northeast Winds to 15 Mph in the afternoon.

Tonight 12 Aug Flathead/Mission Valleys

Partly cloudy in the evening then becoming mostly cloudy. Slight chance of Thunderstorms. Chance of rain Showers. Patchy smoke in the evening. Chance of precipitation 50 percent. Lows in the mid 40s to lower 50s. North Winds 15 to 20 Mph with Gusts to around 30 Mph.

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Flathead Lake State Park - Yellow Bay Unit Temperature Statistics

August Temperature

Kalispell, Glacier Park International Airport (31.1 miles)

  • Lowest 5 August, 2026

    38.6 °F

  • Average August

    63.4 °F

  • Highest 1 August, 2026

    93.7 °F

Climate (2021–2026)

Kalispell, Glacier Park International Airport (31.1 miles)

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  • Average Low 2021–2026

    33.3 °F

  • Average 2021–2026

    45.3 °F

  • Average High 2021–2026

    57 °F
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