Grob Lake Weather Forecast

    • 49
    • 79

    Increasing Clouds

    • 49
    • 78

    Mostly Cloudy

    • 48
    • 72

    Partly Sunny

    • 50
    • 74

    Mostly Cloudy

    • 44
    • 65

    Chance Rain

    • 41
    • 58

    Slight Chance Rain

Today 21 Sep Kootenai/Cabinet Region

Sunny. Patchy fog early in the morning. Highs in the upper 70s to mid 80s.

Tonight 21 Sep Kootenai/Cabinet Region

Mostly clear in the evening then becoming mostly cloudy. Lows in the mid 40s to lower 50s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grob Lake Temperature Statistics

September Temperature

Boundary County Airport (54.1 miles)

  • Lowest 17 September, 2026

    41 °F

  • Average September

    57.2 °F

  • Highest 1 September, 2026

    78.8 °F

Climate (2021–2026)

Boundary County Airport (54.1 miles)

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  • Average Low 2021–2026

    37.9 °F

  • Average 2021–2026

    47.3 °F

  • Average High 2021–2026

    56.7 °F
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