Sienna Weather Forecast

    • 54
    • 84

    Mostly Sunny

    • 54
    • 79

    Mostly Sunny

    • 60
    • 88

    Partly Sunny

    • 54
    • 86

    Slight Chance Thunderstorms

    • 54
    • 82

    Slight Chance Rain Showers

    • 53
    • 83

    Slight Chance Thunderstorms

Today 11 May North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County

Mostly sunny. Highs in the lower to mid 80s.

Tonight 11 May North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County

Mostly clear. Lows 49 to 55. West Winds 10 to 15 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sienna Temperature Statistics

May Temperature

Buckley Air Force Base Airport (0.6 miles)

  • Lowest 6 May, 2026

    29.8 °F

  • Average May

    51.5 °F

  • Highest 9 May, 2026

    74.8 °F

Climate (2021–Present)

Buckley Air Force Base Airport (0.6 miles)

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  • Average Low 2021–2026

    40 °F

  • Average 2021–2026

    52.3 °F

  • Average High 2021–2026

    65.9 °F
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