Portland Weather in December

December in Portland typically sees daytime highs of 4°C (39°F) and nighttime lows of -5°C (23°F). Rainfall is also possible this month, so it's worth packing an umbrella. It falls within the winter season.

Rainfall in Portland in December

Climate statistics over the past 30 years suggest around 14 days of snow/rain, with 139 mm (5.5 in) average for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.

Temperature in Portland in December

December in Portland brings typical temperatures with highs around 4°C (39°F) and lows of -5°C (23°F). Experience the winter season in December. Staying warm is the main priority this month, especially during mornings and evenings. At -5°C (23°F) overnight, frost and ice are likely outside. Indoors, consider packing an extra blanket if you're unsure about the heating. It is a very cold month, so be prepared and make sure to dress up warm. It's always better to be prepared than to find oneself shivering in the cold.

Sunshine in Portland in December

The area enjoys a moderate level of sunlight, with around 140 hours. It's a good balance between sunny and cloudy days.

Average water temperature in December

With water temperatures around 7°C (45°F), swimming isn't really an option for most visitors. The cold sets in quickly and a wetsuit won't fully solve it.

If you're looking for dry conditions and comfortable temperatures, December may not be the ideal month to visit Portland. Our weather planner can help you explore destinations with more pleasant weather conditions.