Flat Mountain Arm Weather Forecast

    • 37
    • 71

    Mostly Sunny

    • 40
    • 73

    Mostly Sunny

    • 40
    • 74

    Chance Thunderstorms

    • 39
    • 70

    Rain Showers Likely

    • 40
    • 72

    Rain Showers Likely

    • 32
    • 56

    Rain Showers

    • 30
    • 48

    Rain/Snow Likely

Today 22 Jun Yellowstone National Park

Mostly sunny. Highs in the upper 60s. West Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 22 Jun Yellowstone National Park

Mostly clear. Lows in the upper 30s. Northwest Winds 10 to 15 Mph, becoming northeast after midnight.

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Flat Mountain Arm Temperature Statistics

June Temperature

Yellowstone Lake (11.2 miles)

  • Lowest 3 June, 2026

    27.6 °F

  • Average June

    47.6 °F

  • Highest 6 June, 2026

    73.7 °F

Climate (2021–2026)

Yellowstone Lake (11.2 miles)

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  • Average Low 2021–2026

    23.1 °F

  • Average 2021–2026

    35.8 °F

  • Average High 2021–2026

    48.7 °F
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