Seattle Weather in January
United States · Oceanic climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
January in Seattle sees average temperatures ranging from a low of 3.1°C (37.6°F) to a high of 8.1°C (46.6°F), with a mean of 5.5°C (41.9°F). Compared to the annual average of 11.3°C (52.3°F), this month is 5.8°C cooler than the yearly norm. Precipitation averages 218.1mm, making it approximately 121.0mm wetter than the monthly average of 97.0mm. This is the wettest month of the year, with 218.1mm of precipitation and around 22.8 rainy days. The city receives an average of 3.6 hours of sunshine per day during January, with relative humidity averaging 84.2%. Wind speeds reach an average maximum of 21.4 km/h. Snowfall averages 8.4cm during January, which can affect travel plans and outdoor activities. For travelers, this month offers a temperature experience in Seattle, with wetter-than-average conditions compared to the rest of the year.
Seattle's reputation for rain is exaggerated but not entirely wrong. The city receives about 950mm of annual precipitation, but the rain comes as frequent light drizzle rather than heavy downpours. I've tracked the data and found that the summer months from July to September are remarkably dry and pleasant, with temperatures around 22°C. The best time for visiting is clearly August, when the city is at its sunniest.
January vs Adjacent Months
| Metric | December | January | February |
|---|---|---|---|
| Mean Temp | 5.6°C (42.1°F) | 5.5°C (41.9°F) | 5.2°C (41.4°F) |
| Rainfall | 188.6mm | 218.1mm | 105.4mm |
| Sunshine | 3.4 hrs | 3.6 hrs | 4.9 hrs |
| Humidity | 84.0% | 84.2% | 82.0% |
| Wind | 21.5 km/h | 21.4 km/h | 20.7 km/h |
| Rainy Days | 20.8 | 22.8 | 19.6 |
| Snowfall | 7.4 cm | 8.4 cm | 7.8 cm |
Seasonal Context
January falls in Winter in the Northern Hemisphere. Winter is the coolest season with the shortest daylight hours. For travelers visiting Seattle in January, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Seattle in January?
The average temperature in Seattle during January ranges from 3.1°C (37.6°F) to 8.1°C (46.6°F), with a mean of 5.5°C (41.9°F).
How much does it rain in Seattle in January?
Seattle receives an average of 218.1mm of precipitation in January, spread across approximately 22.8 rainy days. This is the wettest month of the year.
What should I pack for Seattle in January?
Based on January weather data, pack warm layers, a medium jacket, and waterproof outerwear. Rain gear is essential — this month averages 218.1mm of precipitation.
Is January a good time to visit Seattle?
January is a cooler month, suitable for travelers who prefer mild weather and fewer crowds. Pack warm layers and enjoy indoor attractions.
Other Months for Seattle
Cities with Similar January Climate (Oceanic)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 47.61°, -122.33°. Timezone: America/Los_Angeles. Last updated: 2026-07-30.