Seattle weather in December
Monthly temperatures, rain, humidity, what to wear and what to pack — 2024–2025 historical average
Seattle December weather at a glance
In December, Seattle averages 7.1°C, with typical highs of 9.5°C and lows of 5.3°C. The historical average is 20 wet days and 86% humidity.
Seattle December temperature & humidity
Seattle December rain & wet days
Pack a light rain jacket, waterproof pouch and quick-dry shoes. Keep an indoor stop available between outdoor activities.
What to wear in Seattle in December
A warm jacket or coat over knitwear works well, with an extra layer for mornings and evenings. Rain is frequent at roughly 20 days in the month; pack a rain jacket and water-resistant shoes.
- DaytimeWarm coat and layered tops · average high 9.5°C
- Morning & eveningLong sleeves with a jacket or cardigan · average low 5.3°C
- FootwearComfortable walking shoes; quick-dry footwear for rainy days.
Packing essentials
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Seattle December sunrise & sunset times
2026 December · Local time (America/Los_Angeles)
| Date | Sunrise | Sunset | Daylight |
|---|---|---|---|
| 2026-12-01 | 07:37 | 16:20 | 8h 43m |
| 2026-12-15 | 07:51 | 16:18 | 8h 27m |
| 2026-12-31 | 07:58 | 16:28 | 8h 30m |
For sunset photos, arrive before the listed sunset time. Clouds, mountains and buildings can change when the sun becomes visible or disappears.
Calculated for the city coordinates with daylight saving applied. SunCalc · tz-lookup
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Best months to visit Seattle
Bar height shows our simple weather-comfort score, not a safety rating; colour shows temperature.
December weather by year
Daily weather in 2025
Daily high and low temperatures; blue labels show precipitation
Frequently asked questions
What is Seattle weather like in December?
In December, Seattle averages 7.1°C, with typical highs of 9.5°C and lows of 5.3°C. The historical average is 20 wet days and 86% humidity. Our weather-comfort rating for this month is challenging.
Does it rain a lot in Seattle in December?
There are about 20 wet days in December. Pack a rain jacket and water-resistant shoes.
What should I wear in Seattle in December?
A warm jacket or coat over knitwear works well, with an extra layer for mornings and evenings. Rain is frequent at roughly 20 days in the month; pack a rain jacket and water-resistant shoes.
What are the best months to visit Seattle?
Recent weather data rates June, July, August, September among the more comfortable months.
Where can I check Seattle weather in December in real time?
Check local webcams for the view right now and a local weather service for today’s forecast. Monthly temperatures here are historical averages.
What time are sunrise and sunset in Seattle in December?
On 2026-12-15, calculated sunrise is 07:51 and sunset is 16:18 in local time (America/Los_Angeles). Times vary by date and terrain.
Seattle weather by month
More Americas destinations in December
Open-Meteo (CC BY 4.0) · 2024–2025 historical data, aggregated and rounded by this site. Not a forecast or long-term climate normal. Calculation method and limitations