Seattle weather in October
October in Seattle: cool, rainy, with clean air — a great time to visit.
#7 of 12 months in Seattle · #409 of 604 destinations to visit in October · comfort 70/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Seattle climate normals — October
| Daytime high | 16°C / 60°F | 🙂 cool |
|---|---|---|
| Nighttime low | 8°C / 47°F | |
| Feels like (high) | 14°C / 57°F | |
| Rainfall | 130 mm / 5.1 in | 🌧 rainy |
| Rainy days | 14 days | |
| Humidity | 82% | 💦 very humid |
| Dew point | 9°C / 49°F | |
| Sunshine | 7.1 h/day | |
| Daylight | 10.8 h | |
| Wind | 14 km/h / 9 mph | |
| Air quality (US AQI) | 36 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Seattle in October — FAQ
- Is October a good time to visit Seattle?
- October in Seattle: cool, rainy, with clean air — a great time to visit. It ranks #7 of 12 months for Seattle on SeasonMap's comfort score (70/100).
- What is the weather like in Seattle in October?
- In October, Seattle averages a daily high of 15.5°C and a low of 8.1°C, with about 130.3 mm of rain over roughly 14.2 rainy days.
- What is the air quality in Seattle in October?
- Seattle has a mean US Air Quality Index of about 36 in October.