Johnstown Weather Forecast

    • 59
    • 83

    Thunderstorms Likely

    • 59
    • 87

    Rain Showers Likely

    • 58
    • 85

    Rain Showers Likely

    • 54
    • 83

    Chance Thunderstorms

    • 56
    • 85

    Partly Sunny

    • 57
    • 89

    Partly Sunny

Today 13 Aug Central and South Weld County

Showers likely and chance of Thunderstorms in the afternoon. Some Thunderstorms may produce heavy rainfall in the afternoon. Highs in the lower to mid 80s. East Winds 10 to 15 Mph with Gusts up to 20 Mph in the afternoon. Chance of rain 60 percent.

Tonight 13 Aug Central and South Weld County

Mostly cloudy. Chance of Showers after midnight. Lows in the lower 60s. Chance of rain 40 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Johnstown Temperature Statistics

August Temperature

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

  • Lowest 5 August, 2026

    51.1 °F

  • Average August

    77.8 °F

  • Highest 2 August, 2026

    105.1 °F

Climate (2021–2026)

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

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    38.6 °F

  • Average 2021–2026

    51.9 °F

  • Average High 2021–2026

    66.2 °F
Get WillyWeather+ to remove ads