Portland, Oregon weather in December

Averages from 2021–2025 (155 days of record).

Average high: 47°F
Average low: 38°F
Rainy days: ~20 per month
Total precipitation: 10.4 in
Warmest recorded: 60°F
Coldest recorded: 13°F

Expect December days in Portland, Oregon to top out around 47°F and cool to about 38°F overnight, with roughly 20 days of measurable rain across the month. In recent years December has ranged from 13°F to 60°F.

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Current Portland, Oregon forecast → · Historical data by Open-Meteo (ERA5).