Crater Lake National Park weather in September
September in Crater Lake National Park: nice, a little rain, with clean air — an excellent time to visit.
#4 of 12 months in Crater Lake National Park · #112 of 604 destinations to visit in September · comfort 88/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Crater Lake National Park climate normals — September
| Daytime high | 20°C / 69°F | 😎 nice |
|---|---|---|
| Nighttime low | 7°C / 44°F | |
| Feels like (high) | 17°C / 63°F | |
| Rainfall | 66 mm / 2.6 in | 🌦 some rain |
| Rainy days | 9 days | |
| Humidity | 60% | 💧 humid |
| Dew point | 3°C / 37°F | |
| Sunshine | 10.5 h/day | |
| Daylight | 12.5 h | |
| Wind | 13 km/h / 8 mph | |
| Snowfall | 1.5 cm / 0.6 in | |
| Air quality (US AQI) | 37 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Crater Lake National Park?
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Crater Lake National Park in September — FAQ
- Is September a good time to visit Crater Lake National Park?
- September in Crater Lake National Park: nice, a little rain, with clean air — an excellent time to visit. It ranks #4 of 12 months for Crater Lake National Park on SeasonMap's comfort score (88/100).
- What is the weather like in Crater Lake National Park in September?
- In September, Crater Lake National Park averages a daily high of 20.3°C and a low of 6.6°C, with about 66 mm of rain over roughly 8.6 rainy days.
- What is the air quality in Crater Lake National Park in September?
- Crater Lake National Park has a mean US Air Quality Index of about 37 in September.
- Does it snow in Crater Lake National Park in September?
- Crater Lake National Park sees roughly 1.5 cm of snowfall in September.