Seattle in december: average Weather, Temperature and Climate
Weather in Seattle in december 2026
The weather in Seattle in december comes from statistical datas on the past years. You can view the weather statistics for the whole month, but also by clicking on the tabs for the beginning, the middle and the end of the month.
Average weather throughout december
very bad weather 18.2cm
Weather at 6am
38°F
Clear/Sunny
22% of time
21%
21%
14%
Weather at 12pm
45°F
Clear/Sunny
25% of time
24%
21%
16%
Weather at 6pm
40°F
Clear/Sunny
25% of time
23%
19%
12%
Weather at 3am
38°F
31%
25%
20%
18%
Evolution of daily average temperature and precipitation in Seattle in december
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Seattle in december.
The climate of Seattle in december is very bad
The weather in december in Seattle is wet (with 2.9in of precipitation over 5 days). This is better than the previous month since in november it receives an average of 3.4in of rainfall over 6 days.
The climate is quite cold in this city this month. Do not forget to cover yourself! The thermometer averaged maximum of 45°F. On average, the recorded minimum temperature is 38°F. Thus, the mean temperature average in december in Seattle is 41°F. Note that these seasonal averages are in contrast with those observed in Seattle in the month of december with a maximum record of 59°F in 2017 and a minimum record of 5°F in 2021. You can expect to have about 7 days with temperatures under 32°F, or 23% of the month.
In december in Seattle, the days on average last 08:27. The sun rises at 07:51 and sets at 16:18.
December: another location in the United States (USA)?
If you want to go to the United States (USA) in december, there are destinations with better weather than Seattle:
In december, Miami (Florida) has perfect weather.
Furthermore, Hawaii (Honolulu), Houston, Myrtle Beach, Phoenix (Arizona), Carolina Beach and Dauphin Island (Alabama) have good weather.
Finally, California, Louisiana, Atlanta, Dallas, Austin and Big Bend National Park (Texas) have a tolerable climate, but better than Seattle.
Seasonal average climate and temperature of Seattle in december
Check below seasonal norms These statistics are generated from the weather statements of the past years of december.
| December | |||||
| Outside temperature | |||||
| Average temperature | 41°F | ||||
| Highest temperature | 45°F | ||||
| Lowest temperature | 38°F | ||||
| Highest record temperature | 59°F (2017) | ||||
| Lowest record temperature | 5°F (2021) | ||||
| Number of days at +65°F | 0 day(s) (0%) | ||||
| Number of days at -32°F | 7 day(s) (23%) | ||||
| Sea temperature | |||||
| Average sea temperature | 47°F | ||||
| Lowest sea temperature | 46°F | ||||
| Highest sea temperature | 48°F | ||||
| Wind | |||||
| Wind speed | 11km/h | ||||
| Wind temperature | 34°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 2.9in | ||||
| Number of days with rainfall | 5 day(s) (16%) | ||||
| Record daily rainfall | 1.5in (2019) | ||||
| Snowfall | 18.2cm | ||||
| Other climate data | |||||
| Humidity | 89% | ||||
| Visibility | 8.27km | ||||
| Cloud cover | 56% | ||||
| UV index | 2 | ||||
| Daily sunshine hours | 7 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 07:51 | ||||
| Time of sunset | 16:18 | ||||
| Length of day | 08:27 | ||||
| Our opinion about the weather in december | |||||
| Our opinion at whereandwhen.net | very bad | ||||
How was the weather last december?
Here is the day by day recorded weather in Seattle in december 2025:
34°F to 40°F
41°F to 43°F
40°F to 41°F
40°F to 45°F
45°F to 52°F
49°F to 50°F
45°F to 49°F
49°F to 54°F
47°F to 54°F
50°F to 54°F
50°F to 56°F
47°F to 52°F
50°F to 56°F
49°F to 52°F
54°F to 56°F
49°F to 52°F
45°F to 52°F
41°F to 49°F
40°F to 45°F
41°F to 45°F
41°F to 45°F
41°F to 45°F
41°F to 43°F
40°F to 52°F
43°F to 47°F
41°F to 43°F
32°F to 40°F
32°F to 40°F
31°F to 38°F
32°F to 41°F
32°F to 41°F
Map: other cities in the United States (USA) in december
Cities near Seattle:
| Mount Rainier National Park (Washington) in december | very bad weather |
| Westport (Washington) in december | very bad weather |
| La Push (Washington) in december | very bad weather |
| Ocean Park (Washington) in december | bad weather |
| Long Beach (Washington) in december | bad weather |
| Portland in december | very bad weather |
| Salem (Oregon) in december | very bad weather |
| Lincoln City (Oregon) in december | bad weather |
| Newport (Oregon) in december | bad weather |
| Coos Bay in december | bad weather |
| Crater Lake (Oregon) in december | very bad weather |
| Glacier National Park (Montana) in december | very bad weather |
Click over cities on the map for information about the weather in december.
Seattle
perfect weather
good
tolerable
bad
very bad
Weather data for Seattle in december:
Weather data for Seattle for december are derived from an average of the weather forecast since 2009 in Seattle. There is a margin of error and these forecasts are to be considered as general information only. The weather in Seattle can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Seattle.