Portland, Oregon weather in January

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

Average high: 46°F
Average low: 35°F
Rainy days: ~18 per month
Total precipitation: 7.9 in
Warmest recorded: 64°F
Coldest recorded: 6°F

Expect January days in Portland, Oregon to top out around 46°F and cool to about 35°F overnight, with roughly 18 days of measurable rain across the month. In recent years January has ranged from 6°F to 64°F.

Other months

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