Portland Weather in December

December in Portland averages 11°C (52°F) during the day and 7°C (45°F) at night. Quite a bit of rainfall is typical this month, with around 108 mm (4.3 in) on average. An umbrella is a good idea.

Rainfall in Portland in December

Based on our climate data of the past 30 years, about 17 days of rain are anticipated, with 108 mm (4.3 in) on average. Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.

Temperature in Portland in December

Portland in December gets highs of 11°C (52°F) during the day and drops to 7°C (45°F) at night. The days stay cool from start to finish. Layering up well will make outdoor time much more comfortable. Nights drop to 7°C (45°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.

Sunshine in Portland in December

This month is characterized by fewer sunny days, with about 55 hours of sunshine. It's great for those who appreciate cooler, less sunny days.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. August typically offers the best weather for Portland.