Fortress Mountain Weather Forecast

    • 30
    • 44

    Snow Showers Likely

    • 28
    • 37

    Rain/Snow Likely

    • 31
    • 45

    Mostly Sunny

    • 35
    • 48

    Chance Rain/Snow

    • 33
    • 46

    Chance Rain/Snow

    • 35
    • 50

    Mostly Sunny

    • 36
    • 50

    Partly Sunny

Today 19 Sep Absaroka Mountains

Showers, a chance of Thunderstorms and snow Showers. Some Thunderstorms may produce gusty Winds, small Hail, and heavy rainfall. Snow accumulation up to 1 inch. Near steady temperature in the upper 40s. Northwest Winds around 10 Mph. Chance of precipitation 80 percent.

Tonight 19 Sep Absaroka Mountains

Cloudy with snow Showers likely. Rain Showers with a slight chance of Thunderstorms in the Evening, then rain Showers likely after midnight. Patchy fog after midnight. Some Thunderstorms may produce gusty Winds, small Hail, and heavy rainfall in the evening. Little or no snow accumulation. Lows in the mid 30s. Northwest Winds around 10 Mph in the evening. Chance of precipitation 80 percent.

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Fortress Mountain Temperature Statistics

September Temperature

Yellowstone Lake (33.6 miles)

  • Lowest 15 September, 2026

    25.6 °F

  • Average September

    48.8 °F

  • Highest 6 September, 2026

    72.6 °F

Climate (2021–2026)

Yellowstone Lake (33.6 miles)

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  • Average Low 2021–2026

    23 °F

  • Average 2021–2026

    35.8 °F

  • Average High 2021–2026

    48.5 °F
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