Oregon State

Avg weather in December
9 Hrs per day
210 mm per month
81 % avg
8 Mph avg


What’s the weather like in Oregon State in December?

Explore lush mountains and raft along scenic rivers when you visit Oregon State on holiday. The region has a colder climate in winter, but it’s a great time to visit if you want to explore the state to the fullest since the weather is cool and enjoyable.

Geographical influences

Oregon State weather in December is mainly influenced by the region’s Pacific North-west climate. The coast has colder temperatures in winter with heavy rainfall in the west. On rainy days, it can be very humid towards the mainland with regular winds near the coastline. If you visit Portland, make sure to take some time out of your schedule to see the Japanese Garden, which is home to a range of colourful plants and authentic Japanese architecture.


Temperatures lower to just 5°C in December, which is very cold and it gets even colder at night. Humidity levels are around 81% because of the heavy rainfall in Oregon State over the winter. The average rainfall is 210mm, which means there’s a very high chance of rain with winds reaching speeds of up to 8mph. However, even though it’s one of the wettest months of the year, you’ll still have nine hours of sunlight to enjoy each day.

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