Portland Weather in January
Portland in January sees low daytime temperatures of 8°C (46°F) and nighttime lows of 2°C (36°F). Rainfall is fairly high this month at around 145 mm (5.7 in), so pack a rain jacket to stay dry.
Rainfall in Portland in January
Typically, about 18 days will experience rainfall, with an average of 145 mm (5.7 in) for the month. Wet weather is a regular and significant part of this month. Frequent days of rain combined with high totals means proper waterproofs are worth packing.
Temperature in Portland in January
January in Portland brings typical temperatures with highs around 8°C (46°F) and lows of 2°C (36°F). Winter occurs in January. Even at the warmest part of the day, temperatures stay low. Dressing warmly from the start is the sensible approach. Nights drop to 2°C (36°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.
Sunshine in Portland in January
The month is characterized by fewer sunny days, with roughly 86 hours hours of sunshine. Ideal for those who prefer a cooler, cloudier climate.
Wind Speed in Portland in January
January sees wind speeds averaging 4 m/s (8 knots). You'll experience variable conditions with moderate winds that create small waves on water and keep branches moving. Conditions range from light winds to moderate breezes throughout the month.Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, June, July, August and September typically offer the best weather for Portland.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Portland's climate page.
Portland Temperature in January
Min Temperature
2°C (36°F)
Max Temperature
8°C (46°F)
Chance of Rain
60%
Precipitation
145 mm (5.7 in)
Rainy days
18 days
Humidity
81%
Windspeed
4 m/s (8 knots)
Sunshine
86 hours
Percentage Sunshine
Daily Historical Temperatures
51-year average (1976-2026)
Based on our historical records, temperatures in Portland typically stay consistent throughout January, with daily highs averaging around 8°C (46°F). Nights are cold, with lows around 2°C (36°F).
Average temperatures in January
Daily Historical Precipitation
51-year average (1976-2026)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in January
Historical weather for Portland in January
Browse day-by-day weather records for Portland spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Portland historical weather extremes in January
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Portland.
- Portland recorded its highest January temperature of 18°C (64°F) on January 18, 2005.
- Portland experienced its chilliest January day on January 13, 2024, reaching only -6°C (21°F).
- Portland registered its coldest January night on January 13, 2017, with temperatures dropping to -11°C (12°F).
Best Places in the United States of America in January
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in January →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Portland in January
Dress warmly and in layers for your trip to Portland in January. A good base layer system works wonders. Start with good thermal underwear, add something warm like a fleece sweater, then finish with a waterproof jacket on top. Expect heavy rainfall, so bring good rain protection and waterproof bags. Sunglasses aren't essential this month, though you might want them for the occasional bright moment.What To Do in Portland in January
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Portland's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Portland climate overview or explore weather in the United States of America.
