Portland weather in December
December in Portland: cold, soaked, with clean air — one of the weakest months to visit.
#12 of 12 months in Portland · #508 of 604 destinations to visit in December · comfort 48/100 (tier F)
Updated June 2026 · climate normals from ERA5 reanalysis
Portland climate normals — December
| Daytime high | 9°C / 47°F | 🧥 cold |
|---|---|---|
| Nighttime low | 3°C / 37°F | |
| Feels like (high) | 6°C / 43°F | |
| Rainfall | 205 mm / 8.1 in | ⛈ soaked |
| Rainy days | 19 days | |
| Humidity | 88% | 💦 very humid |
| Dew point | 3°C / 38°F | |
| Sunshine | 3.7 h/day | |
| Daylight | 8.8 h | |
| Wind | 13 km/h / 8 mph | |
| Snowfall | 4.1 cm / 1.6 in | |
| Air quality (US AQI) | 34 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Portland in December — FAQ
- Is December a good time to visit Portland?
- December in Portland: cold, soaked, with clean air — one of the weakest months to visit. It ranks #12 of 12 months for Portland on SeasonMap's comfort score (48/100).
- What is the weather like in Portland in December?
- In December, Portland averages a daily high of 8.6°C and a low of 2.9°C, with about 204.8 mm of rain over roughly 19.4 rainy days.
- What is the air quality in Portland in December?
- Portland has a mean US Air Quality Index of about 34 in December.
- Does it snow in Portland in December?
- Portland sees roughly 4.1 cm of snowfall in December.