Johnstown Weather Forecast

    • 53
    • 91

    Increasing Clouds

    • 47
    • 88

    Partly Sunny

    • 49
    • 86

    Mostly Sunny

    • 48
    • 85

    Partly Sunny

    • 43
    • 81

    Chance Thunderstorms

    • 38
    • 61

    Rain Showers Likely

Today 13 May Central and South Weld County

Mostly sunny. Highs 86 to 92. South Winds 10 to 15 Mph, increasing to 20 to 25 Mph in the afternoon. Gusts up to 35 Mph.

Tonight 13 May Central and South Weld County

Mostly cloudy in the Evening, then becoming partly cloudy. Lows 49 to 57. South Winds 20 to 25 Mph with Gusts up to 35 Mph in the Evening, becoming light.

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  • Temperature Real-Time

Johnstown Temperature Statistics

May Temperature

Fort Collins/Loveland - Northern Colorado Regional Airport (9.3 miles)

  • Lowest 1 May, 2026

    30.9 °F

  • Average May

    54.3 °F

  • Highest 11 May, 2026

    87.1 °F

Climate (2021–Present)

Fort Collins/Loveland - Northern Colorado Regional Airport (9.3 miles)

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  • Average Low 2021–2026

    38.5 °F

  • Average 2021–2026

    51.8 °F

  • Average High 2021–2026

    66.1 °F
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