Mammoth Weather Forecast

    • 49
    • 78

    Areas Smoke

    • 52
    • 82

    Mostly Sunny

    • 55
    • 86

    Mostly Sunny

    • 56
    • 85

    Partly Sunny

    • 55
    • 84

    Partly Sunny

    • 54
    • 83

    Slight Chance Thunderstorms

Today 5 Aug Yellowstone National Park

Sunny. Smoke this Morning, then Areas of smoke this afternoon. Highs in the lower 70s. Southwest Winds 10 to 15 Mph.

Tonight 5 Aug Yellowstone National Park

Mostly clear. Areas of smoke. Lows in the mid 40s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph in the evening.

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  • Temperature Forecast NOAA

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Mammoth Temperature Statistics

August Temperature

West Yellowstone (28 miles)

  • Lowest 2 August, 2026

    39.2 °F

  • Average August

    64.5 °F

  • Highest 1 August, 2026

    91.4 °F

Climate (2021–2026)

West Yellowstone (28 miles)

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  • Average Low 2021–2026

    33.7 °F

  • Average 2021–2026

    50.7 °F

  • Average High 2021–2026

    65.9 °F
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