Keystone Weather Forecast

    • 27
    • 53

    Chance Thunderstorms

    • 30
    • 58

    Snow Showers

    • 30
    • 57

    Slight Chance Thunderstorms

    • 32
    • 61

    Slight Chance Thunderstorms

    • 35
    • 69

    Slight Chance Thunderstorms

    • 37
    • 73

    Chance Thunderstorms

Today 20 May South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and Wes

Rain Showers likely early in the afternoon. Chance of Thunderstorms and snow Showers. New snow accumulation up to 1 inch. Highs 38 to 48. West Winds 10 to 15 Mph with Gusts up to 20 Mph. Chance of precipitation 70 percent.

Tonight 20 May South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and Wes

Partly cloudy. Slight chance of Thunderstorms and snow Showers early in the evening. Lows 19 to 29. Chance of snow 10 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Keystone Temperature Statistics

May Temperature

Copper Mountain - Red Cliff Pass (13.7 miles)

  • Lowest 6 May, 2026

    14 °F

  • Average May

    33.7 °F

  • Highest 12 May, 2026

    51.8 °F

Climate (2021–Present)

Copper Mountain - Red Cliff Pass (13.7 miles)

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  • Average Low 2021–2026

    30 °F

  • Average 2021–2026

    36.4 °F

  • Average High 2021–2026

    42.7 °F
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