Portland weather in January
January in Portland: cold, soaked, with clean air — a fair time to visit.
#11 of 12 months in Portland · #453 of 604 destinations to visit in January · comfort 53/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Portland climate normals — January
| Daytime high | 10°C / 49°F | 🧥 cold |
|---|---|---|
| Nighttime low | 3°C / 37°F | |
| Feels like (high) | 7°C / 45°F | |
| Rainfall | 183 mm / 7.2 in | ⛈ soaked |
| Rainy days | 19 days | |
| Humidity | 85% | 💦 very humid |
| Dew point | 3°C / 37°F | |
| Sunshine | 4.2 h/day | |
| Daylight | 9.2 h | |
| Wind | 14 km/h / 9 mph | |
| Snowfall | 1.9 cm / 0.7 in | |
| Air quality (US AQI) | 31 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Portland in January — FAQ
- Is January a good time to visit Portland?
- January in Portland: cold, soaked, with clean air — a fair time to visit. It ranks #11 of 12 months for Portland on SeasonMap's comfort score (53/100).
- What is the weather like in Portland in January?
- In January, Portland averages a daily high of 9.6°C and a low of 3°C, with about 183.3 mm of rain over roughly 18.6 rainy days.
- What is the air quality in Portland in January?
- Portland has a mean US Air Quality Index of about 31 in January.
- Does it snow in Portland in January?
- Portland sees roughly 1.9 cm of snowfall in January.