King County (Seattle)
December
Weather in King County, Washington for December 2026
Your guide to King County weather in December - trends and predictions
With an average of 2 snowy days, King County usually enjoys a light touch of snow in December.
In general, the average temperature in King County at the beginning of December is 6.6 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 5.8 °C by the end of December.
King County in December brings notable rainfall, with an average of 18 rainy days and a total precipitation of 254.8 mm.
Is December a good time to visit King County? check out the best time to travel to King County page.
✨ Is December a good time to visit King County? – Ask the AI Weatherman
Snow Forecast ❄️
Temperatures
Rain 🌧️
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11
Dry days
18
Rainy days
2
Snow days
7°/3°
Temperatures
14 km/h
Avg max wind
87 %
Avg humidity
King County Weather December
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Temperatures trend during December in King County
See the weather trend as well as the moving average line
December weather in King County day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Dec. 1 |  Light rain | 6° /1° | 2.8 mm | 0 cm | |
| Dec. 2 |  Heavy rain at times | 6° /2° | 5.1 mm | 0.3 cm | |
| Dec. 3 | Light rain | 6° /1° | 2.5 mm | 0.8 cm | |
| Dec. 4 |  Moderate rain | 6° /0° | 13.2 mm | 0 cm | |
| Dec. 5 | Moderate rain | 7° /2° | 12.5 mm | 0 cm | |
| Dec. 6 | Light rain | 7° /5° | 6.2 mm | 0 cm | |
| Dec. 7 | Moderate rain | 8° /5° | 12.5 mm | 0 cm | |
| Dec. 8 | Heavy rain at times | 9° /4° | 10.4 mm | 0 cm | |
| Dec. 9 | Moderate rain | 6° /3° | 14.8 mm | 0 cm | |
| Dec. 10 | Moderate rain | 7° /2° | 12.3 mm | 0 cm | |
| Dec. 11 |  Moderate or heavy rain shower | 8° /4° | 5.9 mm | 0 cm | |
| Dec. 12 |  Mist | 7° /3° | 0.8 mm | 0 cm | |
| Dec. 13 | Light rain | 7° /3° | 4.3 mm | 0 cm | |
| Dec. 14 | Light rain | 7° /4° | 3.2 mm | 0 cm | |
| Dec. 15 | Light rain | 8° /3° | 3.1 mm | 0 cm | |
| Dec. 16 | Light rain | 7° /3° | 8.2 mm | 0 cm | |
| Dec. 17 | Light rain | 8° /3° | 5.9 mm | 0 cm | |
| Dec. 18 | Moderate rain | 8° /4° | 13.2 mm | 0.2 cm | |
| Dec. 19 | Moderate or heavy rain shower | 6° /3° | 9.4 mm | 0 cm | |
| Dec. 20 | Light rain | 7° /4° | 3.4 mm | 0.3 cm | |
| Dec. 21 | Moderate rain | 6° /2° | 16.7 mm | 0.1 cm | |
| Dec. 22 | Moderate or heavy rain shower | 5° /2° | 8.3 mm | 0 cm | |
| Dec. 23 |  Light snow | 6° /1° | 5.6 mm | 1.7 cm | |
| Dec. 24 | Moderate rain | 7° /2° | 10 mm | 0 cm | |
| Dec. 25 | Moderate rain | 6° /3° | 13.9 mm | 0.1 cm | |
| Dec. 26 | Moderate rain | 7° /3° | 23.4 mm | 1.8 cm | |
| Dec. 27 | Moderate rain at times | 5° /2° | 7.4 mm | 0 cm | |
| Dec. 28 |  Patchy rain possible | 6° /1° | 2 mm | 0 cm | |
| Dec. 29 | Light rain | 5° /1° | 7.5 mm | 0 cm | |
| Dec. 30 | Moderate or heavy rain shower | 6° /2° | 7.7 mm | 0.6 cm | |
| Dec. 31 | Light rain | 6° /1° | 2.6 mm | 0 cm | |
| Next | |||||
Important Notice
Our weather forecast for King County in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the King County forecast closer to your planned date for the most up-to-date weather information.
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King County in December - FAQ
What are the expected maximum and minimum temperatures in King County during December?
Prepare for cooler days with highs just around 7° and colder nights, dipping below 3°.
How much rainfall should be expected in King County during December?
Significant rainfall exceeding 254.8 mm is expected in King County during December, occurring over more than 18 days. Preparing for wet conditions is recommended in your planning.
Will it snow in King County in December 2026?
King County experiences an average snowfall of 4.8 cm during December, occurring over 2 days.
What are the typical wind conditions in King County during December?
The average wind speed in King County during December is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
King County snow forecast December 2026
Track daily snowfall levels and discover King County’s snowy potential this December ❄️
On average, King County sees 2 snowy days during December, with approximately 4.8 cm of total snowfall.
December rainfall patterns in King County
Explore the daily rainfall trends and prepare for King Countys December weather 💧
Typically, King County has 18 rainy days in December with a total of 254.8 mm of rainfall.
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