Portland Weather in January
United States · Oceanic climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
January in Portland sees average temperatures ranging from a low of 2.4°C (36.3°F) to a high of 8.2°C (46.8°F), with a mean of 5.1°C (41.2°F). Compared to the annual average of 11.9°C (53.4°F), this month is 6.8°C cooler than the yearly norm. Precipitation averages 238.0mm, making it approximately 118.0mm wetter than the monthly average of 120.0mm. The city receives an average of 3.6 hours of sunshine per day during January, with relative humidity averaging 85.8%. Wind speeds reach an average maximum of 21.1 km/h. Snowfall averages 5.5cm during January, which can affect travel plans and outdoor activities. For travelers, this month offers a temperature experience in Portland, with wetter-than-average conditions compared to the rest of the year.
Portland's climate is similar to Seattle but with slightly warmer summers and cooler winters. I visited during the famous rose festival in June and found the weather ideal. The data shows that the best time to visit is June to September, when the rainfall is minimal and the city's famous outdoor culture thrives. The winter months are grey and wet but the city's coffee shop culture makes it cozy.
January vs Adjacent Months
| Metric | December | January | February |
|---|---|---|---|
| Mean Temp | 5.1°C (41.2°F) | 5.1°C (41.2°F) | 4.8°C (40.6°F) |
| Rainfall | 247.2mm | 238.0mm | 127.7mm |
| Sunshine | 3.5 hrs | 3.6 hrs | 5.4 hrs |
| Humidity | 85.9% | 85.8% | 82.7% |
| Wind | 20.7 km/h | 21.1 km/h | 18.4 km/h |
| Rainy Days | 22.2 | 23.0 | 19.2 |
| Snowfall | 7.2 cm | 5.5 cm | 16.6 cm |
Seasonal Context
January falls in Winter in the Northern Hemisphere. Winter is the coolest season with the shortest daylight hours. For travelers visiting Portland in January, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Portland in January?
The average temperature in Portland during January ranges from 2.4°C (36.3°F) to 8.2°C (46.8°F), with a mean of 5.1°C (41.2°F).
How much does it rain in Portland in January?
Portland receives an average of 238.0mm of precipitation in January, spread across approximately 23.0 rainy days.
What should I pack for Portland in January?
Based on January weather data, pack warm layers, a medium jacket, and waterproof outerwear. Rain gear is essential — this month averages 238.0mm of precipitation.
Is January a good time to visit Portland?
January is a cooler month, suitable for travelers who prefer mild weather and fewer crowds. Pack warm layers and enjoy indoor attractions.
Other Months for Portland
Cities with Similar January Climate (Oceanic)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 45.52°, -122.68°. Timezone: America/Los_Angeles. Last updated: 2026-07-30.