Great Sand Dunes National Park Weather Forecast

    • 40
    • 71

    Slight Chance Thunderstorms

    • 41
    • 69

    Mostly Sunny

    • 43
    • 73

    Partly Sunny

    • 44
    • 74

    Mostly Sunny

    • 43
    • 74

    Mostly Sunny

    • 44
    • 74

    Slight Chance Thunderstorms

    • 45
    • 77

    Mostly Sunny

Today 17 Sep Alamosa Vicinity/Central San Luis Valley Below 8500 Ft

Mostly sunny. Highs in the lower to mid 70s. South Winds up to 10 Mph becoming west around 10 Mph in the afternoon.

Tonight 17 Sep Alamosa Vicinity/Central San Luis Valley Below 8500 Ft

Partly cloudy. Lows 36 to 41. North Winds up to 10 Mph.

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Great Sand Dunes National Park Temperature Statistics

September Temperature

San Luis Valley Regional Airport (23 miles)

  • Lowest 14 September, 2025

    34 °F

  • Average September

    57.4 °F

  • Highest 2 September, 2025

    81 °F

Climate (2020–Present)

San Luis Valley Regional Airport (23 miles)

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  • Average Low 2020–2025

    26.4 °F

  • Average 2020–2025

    44.5 °F

  • Average High 2020–2025

    62.4 °F
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