Johnstown Weather Forecast

    • 45
    • 69

    Areas Smoke

    • 50
    • 79

    Partly Sunny

    • 50
    • 83

    Slight Chance Thunderstorms

    • 51
    • 82

    Partly Sunny

    • 50
    • 80

    Slight Chance Rain Showers

    • 49
    • 79

    Slight Chance Thunderstorms

    • 48
    • 77

    Chance Rain Showers

Today 5 Sep Wind River Basin

Sunny. Areas of smoke. Highs around 70. Northeast Winds around 10 Mph.

Tonight 5 Sep Wind River Basin

Areas of smoke in the evening. Clear. Lows in the mid 40s. East Winds around 10 Mph.

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Johnstown Temperature Statistics

September Temperature

Riverton Regional Airport (13 miles)

  • Lowest 1 September, 2025

    48.9 °F

  • Average September

    70.9 °F

  • Highest 2 September, 2025

    87.1 °F

Climate (2020–Present)

Riverton Regional Airport (13 miles)

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  • Average Low 2020–2025

    32.6 °F

  • Average 2020–2025

    45.4 °F

  • Average High 2020–2025

    58.3 °F
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