Weather in Seattle in December 2024
- December is usually the coldest month of the year in Seattle;
- December is usually the wettest month of the year in Seattle;
Average weather
Average temperature in Seattle in December
Going from a maximum of +59°F during the day to a minimum of +34°F during the night, the temperature in December averages around +50°F.
The average maximum temperature goes up 7% by the end of the month, compared with the beginning of the month, from +48°F to +50°F.
Is Seattle warm or cold in December?
Seattle is typically chill in December.
Maximum temperatures go down compared to the previous month from +50°F to +45°F. The minimum temperature also goes down from +43°F to +39°F.
Pack a jumper and a jacket as there will be cooler temperatures.
December is the coldest month in Seattle, here is the comparison with other months:
Water temperature in Seattle in December
Water in Seattle in December is Cold. It varies from +45°F to +48°F, with an average of +47°F. Note that the air temperature is lower than the water temperature, averaging around +45°F.
In December, water temperatures are average relative to the rest of the year:
Can you swim in Seattle in December?
Travel to Seattle
Climate in Seattle in December
| November | December | January | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +50°F | +45°F | +46°F | ||||
| Min. temperature | ||||||
| +12°F | +9°F | +14°F | ||||
| Max. temperature | ||||||
| +64°F | +59°F | +59°F | ||||
| Rainfall | ||||||
| 177 mm | 166 mm | 173 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Avg. water temperature | ||||||
| +48°F | +47°F | +46°F | ||||
| Humidity | ||||||
| 85% | 86% | 86% | ||||
| Air pressure | ||||||
| 1016 HPa | 1016 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 1 | 1 | 2 | ||||
| Cloudy days | ||||||
| 7 | 8 | 8 | ||||
| Rainy days | ||||||
| 21 | 20 | 19 | ||||
| Snowy days | ||||||
| 0 | 2 | 2 | ||||
December weather is still as bad as in November. It’s getting colder in December. From +50°F in the day, the average maximum temperature lowers to +45°F. As December arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 177 mm to 166 mm. Humidity rises from 85% to 86%. The average wind speed doesn’t change much during December, staying around 2 m/s. The amount of sunny days stay about the same, averaging 1 sunny days during the month.
January brings much the same weather, it remains bad.
Wind
The average wind speed is 1 m/s getting up to 3 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Seattle is gradually decreasing during December, going from 3 m/s to 2 m/s over the course of the month.
Rain
Snow
December is one of the snowiest months in Seattle.
Here’s how December is compared with other months in the amount of snow, total mm:
How was the weather last December in Seattle?
Climate Change Over the Years
The climate in Seattle in December has not changed that much over the last 43 years.
The average temperature was the lowest in 2011 (+57°F) and the highest in 2014 (+62°F). The driest year was 1985 with only 714 mm of rainfall, and the wettest year was 2021 with 2549 mm.
FAQ
Is December a good time to visit Seattle?
Can you sunbathe in Seattle in December?
Can you swim in Seattle in December?
Is Seattle rainy in December?
Is it sunny in Seattle in December?
How much does it cost to fly to Seattle in December?
Other cities in USA
Monthly weather in Seattle
Source of the data
For this page, we’ve looked at the typical weather in Seattle, based on historical hourly weather data from January 1, 1979, to December 31, 2022.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.