Island Park Weather Forecast

    • 35
    • 55

    Rain Showers Likely

    • 37
    • 52

    Rain Showers Likely

    • 38
    • 52

    Chance Rain Showers

    • 38
    • 57

    Mostly Sunny

    • 41
    • 60

    Partly Sunny

    • 42
    • 61

    Slight Chance Thunderstorms

Today 15 Sep Bighorn Mountains West

Mostly sunny with a chance of rain Showers in the Morning, then partly cloudy with rain Showers likely with a chance of Thunderstorms in the afternoon. Highs in the lower 60s. South Winds 10 to 15 Mph, becoming west in the afternoon. Gusts up to 30 Mph. Chance of rain 60 percent.

Tonight 15 Sep Bighorn Mountains West

Partly cloudy. A chance of rain Showers with a slight chance of Thunderstorms in the Evening, then rain Showers likely after midnight. Lows in the lower 40s. North Winds around 10 Mph with Gusts up to 20 Mph in the evening. Chance of rain 60 percent.

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Island Park Temperature Statistics

September Temperature

Buffalo - Johnson County Airport (28 miles)

  • Lowest 6 September, 2025

    43 °F

  • Average September

    65.6 °F

  • Highest 10 September, 2025

    87.1 °F

Climate (2020–Present)

Buffalo - Johnson County Airport (28 miles)

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  • Average Low 2020–2025

    36.5 °F

  • Average 2020–2025

    47.6 °F

  • Average High 2020–2025

    58.8 °F
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