Avg High
Seattle in December
Verdict
In Seattle, December has a distinct winter feel. As the season moves along, temperatures are dropping quickly. You can usually expect a cold month that feels variable day to day. Breezes can be part of the character, especially in exposed spots.
It suits travellers who want straightforward weather for sightseeing and day trips. Lookouts and coastal walks can feel sharper when the wind is up.
Avg Low
Rain
Daylight
8h
What to expect
- Temperature feel - Wintry air with an even, steady feel across the day. It often feels a touch cooler in the shade.
- Showers & dry spells - Expect plenty of wet weather. Expect damp surfaces and slick paths. You’ll want a proper rain setup rather than a ‘just in case’.
- Sun & UV - Soft sunlight. Shade and sunscreen are optional rather than essential for most people. Shade breaks feel genuinely worthwhile.
- Exposure - A steady breeze, and umbrellas and loose items can struggle on gustier days. Sheltered streets can feel fine, but open areas feel very different.
December in context
How it compares to the rest of the year in Seattle.
Hottest (avg)
#12 / 12
Wettest (avg)
#2 / 12
Daylight Hours
#12 / 12
Windiest (avg)
#2 / 12
Highest UV
#12 / 12
Most Humid
#3 / 12
Temperature
- Daytime high
-
- Nighttime low
-
- Feels like (avg)
-
Sunshine
- Daylight
- 8.5 hours
- UV index (max)
- 2
- Typical sun hours
- 07:49 – 16:19
Rain & Snow
- Total
-
- Rainy days
- 20
- Cloud cover
- 78%
- Snowfall
-
Humidity & Wind
- Humidity (avg)
- 84%
- Wind (avg)
-
- Wind (max gusts)
-
Frequently asked questions
Is December a good time to visit Seattle?
Typical December days in Seattle reach highs of 7°C (45°F) with nights around 2°C (36°F). It usually feels chilly by day and very cold after dark. It is among the wetter months, so it is wise to have some indoor backup plans or flexible activities.
What are temperatures like in December?
In December, you can usually expect highs of 7°C (45°F) and lows near 2°C (36°F). That means chilly days and very cold nights, so pack layers you can add or remove.
How much does it rain in December?
Rainfall in December averages 183 mm (7.2 in) across roughly 20 days. Overall it is a very wet time of year, so a light rain jacket and waterproof shoes are very handy.
How many hours of daylight are there in December?
You can expect about 8 hours of daylight in December. Sunrise is typically around 07:49 and sunset near 16:19. Daylight is quite limited, and it can feel like a short-day season.
How strong is the sun in December?
UV levels are usually low (around 2), so standard sun protection is enough.
Is it windy in December?
In December, average wind speeds are around 11 km/h (7 mph), with gusts on the windiest days reaching about 63 km/h (39 mph). On the ground, it is it is a notably windy place, and strong gusts are fairly common.