Silverthorne Weather Forecast

    • 30
    • 62

    Chance Thunderstorms

    • 31
    • 62

    Slight Chance Thunderstorms

    • 35
    • 68

    Partly Sunny

    • 36
    • 66

    Slight Chance Thunderstorms

    • 36
    • 65

    Slight Chance Thunderstorms

    • 34
    • 66

    Mostly Sunny

    • 37
    • 71

    Mostly Sunny

Today 17 Sep Grand and Summit Counties Below 9000 Feet

Partly cloudy in the Morning, then becoming mostly cloudy. Slight chance of rain Showers in the Morning, then a chance of Thunderstorms in the afternoon. Highs 56 to 64. Northwest Winds 10 to 15 Mph in the afternoon. Chance of rain 40 percent.

Tonight 17 Sep Grand and Summit Counties Below 9000 Feet

Mostly cloudy. Chance of rain Showers and slight chance of Thunderstorms in the Evening, then a slight chance of rain Showers after midnight. Lows 29 to 35. Chance of rain 40 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Silverthorne Temperature Statistics

September Temperature

Copper Mountain - Red Cliff Pass (11.2 miles)

  • Lowest 14 September, 2025

    33.8 °F

  • Average September

    51 °F

  • Highest 1 September, 2025

    66.2 °F

Climate (2020–Present)

Copper Mountain - Red Cliff Pass (11.2 miles)

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

  • Average Low 2020–2025

    29.6 °F

  • Average 2020–2025

    36.1 °F

  • Average High 2020–2025

    42.4 °F
Get WillyWeather+ to remove ads