Seattle weather in January
January in Seattle: cold, soaked, with clean air — one of the weakest months to visit.
#11 of 12 months in Seattle · #495 of 604 destinations to visit in January · comfort 48/100 (tier F)
Updated June 2026 · climate normals from ERA5 reanalysis
Seattle climate normals — January
| Daytime high | 8°C / 47°F | 🧥 cold |
|---|---|---|
| Nighttime low | 3°C / 37°F | |
| Feels like (high) | 6°C / 43°F | |
| Rainfall | 205 mm / 8.1 in | ⛈ soaked |
| Rainy days | 19 days | |
| Humidity | 86% | 💦 very humid |
| Dew point | 2°C / 36°F | |
| Sunshine | 4.2 h/day | |
| Daylight | 8.9 h | |
| Wind | 16 km/h / 10 mph | |
| Snowfall | 3.5 cm / 1.4 in | |
| Air quality (US AQI) | 34 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Seattle in January — FAQ
- Is January a good time to visit Seattle?
- January in Seattle: cold, soaked, with clean air — one of the weakest months to visit. It ranks #11 of 12 months for Seattle on SeasonMap's comfort score (48/100).
- What is the weather like in Seattle in January?
- In January, Seattle averages a daily high of 8.2°C and a low of 2.7°C, with about 205.1 mm of rain over roughly 19.2 rainy days.
- What is the air quality in Seattle in January?
- Seattle has a mean US Air Quality Index of about 34 in January.
- Does it snow in Seattle in January?
- Seattle sees roughly 3.5 cm of snowfall in January.