Great Basin National Park weather in September
September in Great Basin National Park: cool, dry, with clean air — an excellent time to visit.
#4 of 12 months in Great Basin National Park · #114 of 604 destinations to visit in September · comfort 88/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Great Basin National Park climate normals — September
| Daytime high | 17°C / 63°F | 🙂 cool |
|---|---|---|
| Nighttime low | 5°C / 42°F | |
| Feels like (high) | 14°C / 57°F | |
| Rainfall | 28 mm / 1.1 in | ☀️ dry |
| Rainy days | 5 days | |
| Humidity | 41% | 🍃 comfortable |
| Dew point | -4°C / 25°F | |
| Sunshine | 11.2 h/day | |
| Daylight | 12.4 h | |
| Wind | 14 km/h / 9 mph | |
| Snowfall | 0.1 cm / 0 in | |
| Air quality (US AQI) | 44 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Great Basin National Park?
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Great Basin National Park in September — FAQ
- Is September a good time to visit Great Basin National Park?
- September in Great Basin National Park: cool, dry, with clean air — an excellent time to visit. It ranks #4 of 12 months for Great Basin National Park on SeasonMap's comfort score (88/100).
- What is the weather like in Great Basin National Park in September?
- In September, Great Basin National Park averages a daily high of 17.3°C and a low of 5.4°C, with about 28.2 mm of rain over roughly 5.2 rainy days.
- What is the air quality in Great Basin National Park in September?
- Great Basin National Park has a mean US Air Quality Index of about 44 in September.