Great Sand Dunes National Park Weather Forecast

    • 48
    • 83

    Becoming Sunny

    • 50
    • 86

    Slight Chance Thunderstorms

    • 51
    • 86

    Slight Chance Thunderstorms

    • 51
    • 87

    Slight Chance Thunderstorms

    • 52
    • 89

    Slight Chance Thunderstorms

    • 51
    • 87

    Chance Thunderstorms

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

Sunny. Highs in the lower to mid 80s. Light Winds becoming southwest up to 10 Mph in the afternoon.

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

Mostly cloudy until midnight then clearing. Lows in the mid to upper 40s, except 47 to 55 near the Mountains. Southwest Winds up to 10 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Great Sand Dunes National Park Temperature Statistics

August Temperature

San Luis Valley Regional Airport (23 miles)

  • Lowest 3 August, 2025

    39.7 °F

  • Average August

    66 °F

  • Highest 7 August, 2025

    91.7 °F

Climate (2020–Present)

San Luis Valley Regional Airport (23 miles)

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

  • Average Low 2020–2025

    26.3 °F

  • Average 2020–2025

    44.5 °F

  • Average High 2020–2025

    62.3 °F
Get WillyWeather+ to remove ads