Grassy Lake Weather Forecast

    • 34
    • 51

    Chance Rain/Snow

    • 39
    • 59

    Mostly Sunny

    • 48
    • 67

    Partly Sunny

    • 50
    • 72

    Breezy

    • 42
    • 67

    Sunny

    • 47
    • 68

    Mostly Sunny

Today 13 Jun Gallatin and Madison County Mountains and Centennial Mountains

Mostly cloudy with slight chance of rain Showers and snow Showers in the Morning, then mostly sunny with slight chance of Thunderstorms in the afternoon. Highs 47 to 59. North Winds 10 to 15 Mph with Gusts to around 35 Mph. Chance of precipitation 20 percent.

Tonight 13 Jun Gallatin and Madison County Mountains and Centennial Mountains

Cooler. Partly cloudy. Chance of rain Showers, snow Showers and slight chance of Thunderstorms. Highs 47 to 59. Lows 29 to 40. Northeast Winds up to 15 Mph with Gusts to around 40 Mph. Chance of precipitation 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grassy Lake Temperature Statistics

June Temperature

Ennis - Big Sky Airport (11.2 miles)

  • Lowest 8 June, 2026

    28.4 °F

  • Average June

    54.2 °F

  • Highest 5 June, 2026

    78.8 °F

Climate (2021–Present)

Ennis - Big Sky Airport (11.2 miles)

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  • Average Low 2021–2026

    32.1 °F

  • Average 2021–2026

    44.6 °F

  • Average High 2021–2026

    56.5 °F
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