Month-by-month travel weather
Seattle December weather
Seattle, United States · December
Comfort depends on staying dry and layered
December is frequently rainy and cloudy. Even with mild temperatures, damp air and wind can feel chilling.
If you mix in indoor anchors, the trip can feel smoother despite the weather.
December averages at a glance
Average low
around 2–4°C
Average high
around 7–9°C
Average precipitation
around 120–170 mm
Rainy days
about 16–20 days
What to wear in December in Seattle
Actual feel will change with wind and rain, but use the suggestions below to build a comfortable layered outfit.
- • Rain-ready outer layer + layers works well.
- • A hood/hat helps with wind and drizzle.
- • Keeping feet dry improves comfort a lot.
Travel tips for visiting Seattle in December
- • Plan routes assuming rain is possible most days.
- • Use cafés/markets/museums as mid-day resets.
December weather in Seattle — FAQ
Q. Is December very cold?
A. It’s often mild by temperature, but damp wind can feel cold—rain gear matters.
Q. Is it gray all day?
A. It can be, though there are still occasional bright breaks.
Explore Seattle
These pages are connected so you can compare conditions and decide for yourself.