Johnstown Weather Forecast

    • 57
    • 84

    Breezy

    • 46
    • 86

    Breezy

    • 49
    • 86

    Mostly Sunny

    • 50
    • 81

    Chance Thunderstorms

    • 45
    • 80

    Rain Showers Likely

    • 38
    • 62

    Chance Rain Showers

Today 13 May Brown

Breezy, sunny. Highs in the lower 80s. South Winds 10 to 15 Mph, increasing to 15 to 25 Mph in the afternoon.

Tonight 13 May Brown

Windy. Mostly clear in the Evening, then becoming mostly cloudy. Lows in the mid 50s. South Winds 15 to 30 Mph.

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Johnstown Temperature Statistics

May Temperature

Ainsworth Regional Airport (2.5 miles)

  • Lowest 1 May, 2026

    30.9 °F

  • Average May

    54.2 °F

  • Highest 11 May, 2026

    88 °F

Climate (2021–Present)

Ainsworth Regional Airport (2.5 miles)

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  • Average Low 2021–2026

    38 °F

  • Average 2021–2026

    49.9 °F

  • Average High 2021–2026

    62.5 °F
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