Seattle, Washington weather in January

Averages from 2021–2025 (155 days of record).

Average high

46°F

Average low

37°F

Rainy days

~16 per month

Total precipitation

6.7 in

Warmest recorded

63°F

Coldest recorded

14°F

Expect January days in Seattle, Washington to top out around 46°F and cool to about 37°F overnight, with roughly 16 days of measurable rain across the month. In recent years January has ranged from 14°F to 63°F.