Great Sand Dunes National Park Weather Forecast

    • 10
    • 33

    Mostly Sunny

    • 12
    • 36

    Mostly Sunny

    • 19
    • 41

    Partly Sunny

    • 23
    • 44

    Partly Sunny

    • 21
    • 46

    Mostly Sunny

    • 19
    • 45

    Mostly Sunny

    • 18
    • 44

    Mostly Sunny

Today 7 Dec Alamosa Vicinity/Central San Luis Valley Below 8500 Ft

Sunny. Highs in the mid to upper 30s. Northeast Winds up to 10 Mph.

Tonight 7 Dec Alamosa Vicinity/Central San Luis Valley Below 8500 Ft

Partly cloudy. Lows 5 to 8, except 8 to 18 near the Mountains. West Winds up to 30 Mph.

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Great Sand Dunes National Park Temperature Statistics

December Temperature

San Luis Valley Regional Airport (23 miles)

  • Lowest 5 December, 2025

    0 °F

  • Average December

    21.5 °F

  • Highest 1 December, 2025

    39 °F

Climate (2020–Present)

San Luis Valley Regional Airport (23 miles)

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  • Average Low 2020–2025

    26.5 °F

  • Average 2020–2025

    44.6 °F

  • Average High 2020–2025

    62.4 °F
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