Flat Mountain Arm Weather Forecast

    • 40
    • 77

    Sunny

    • 47
    • 80

    Slight Chance Thunderstorms

    • 46
    • 77

    Chance Thunderstorms

    • 44
    • 71

    Chance Thunderstorms

    • 41
    • 70

    Rain Showers Likely

    • 40
    • 69

    Chance Thunderstorms

Today 30 Jun Yellowstone National Park

Sunny. Highs in the mid 70s. Southeast Winds around 10 Mph, becoming southwest this afternoon.

Tonight 30 Jun Yellowstone National Park

Clear. Lows in the lower 40s. Southwest Winds around 10 Mph, becoming southeast after midnight.

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  • Temperature Real-Time

Flat Mountain Arm Temperature Statistics

June Temperature

Yellowstone Lake (11.2 miles)

  • Lowest 5 June, 2025

    26.1 °F

  • Average June

    50.4 °F

  • Highest 19 June, 2025

    78.7 °F

Climate (2020–Present)

Yellowstone Lake (11.2 miles)

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  • Average Low 2020–2025

    22.3 °F

  • Average 2020–2025

    35.1 °F

  • Average High 2020–2025

    47.9 °F
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