Portland Weather in December

December in Portland brings low temperatures around 7°C (45°F) during the day, dropping to 2°C (36°F) at night, with the most rainfall of the year.

Rainfall in Portland in December

The heaviest rainfall of the year happens this month, with frequent showers. A poncho is your best bet to stay dry. Climate statistics over the past 30 years suggest around 20 days of rain, with 179 mm (7 in) average for the month. This is a wet month with frequent and often heavy showers. Both the number of rain days and the total rainfall are high.

Temperature in Portland in December

Temperatures in Portland in December top out at 7°C (45°F) and drop to 2°C (36°F) overnight. This month falls in the winter season. It stays cool throughout the day, so warm layers are a good idea from morning to evening. With overnight lows of 2°C (36°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets. Typically, it's the chilliest month of the year. Ensure you're prepared by packing appropriate winter gear.

Sunshine in Portland in December

With limited sunshine this month, there are about 64 hours of sun. It's ideal for those who prefer a cooler, cloudier climate.

Wind Speed in Portland in December

Wind speeds average 3 m/s (6 knots) during December. At this speed, light breezes keep leaves and small twigs in gentle motion while the wind also provides natural cooling. Since this is an average, some days are more tranquil while others have more persistent light winds that are more noticeable.

If you prefer dry days with pleasant temperatures, December may not be the ideal month to visit Portland. Our weather planner can help you explore destinations with more pleasant weather conditions.