Great Sand Dunes National Park weather in August
August in Great Sand Dunes National Park: warm, dry, with clean air — an excellent time to visit.
#3 of 12 months in Great Sand Dunes National Park · #71 of 604 destinations to visit in August · comfort 90/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
Great Sand Dunes National Park climate normals — August
| Daytime high | 28°C / 82°F | 🌤 warm |
|---|---|---|
| Nighttime low | 14°C / 57°F | |
| Feels like (high) | 26°C / 79°F | |
| Rainfall | 22 mm / 0.9 in | ☀️ dry |
| Rainy days | 7 days | |
| Humidity | 54% | 🍃 comfortable |
| Dew point | 8°C / 47°F | |
| Sunshine | 12.1 h/day | |
| Daylight | 13.6 h | |
| Wind | 14 km/h / 9 mph | |
| Air quality (US AQI) | 40 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Great Sand Dunes National Park?
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Great Sand Dunes National Park in August — FAQ
- Is August a good time to visit Great Sand Dunes National Park?
- August in Great Sand Dunes National Park: warm, dry, with clean air — an excellent time to visit. It ranks #3 of 12 months for Great Sand Dunes National Park on SeasonMap's comfort score (90/100).
- What is the weather like in Great Sand Dunes National Park in August?
- In August, Great Sand Dunes National Park averages a daily high of 27.5°C and a low of 13.8°C, with about 22.4 mm of rain over roughly 6.8 rainy days.
- What is the air quality in Great Sand Dunes National Park in August?
- Great Sand Dunes National Park has a mean US Air Quality Index of about 40 in August.