Portland, Oregon weather in March

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

Average high: 53°F
Average low: 38°F
Rainy days: ~19 per month
Total precipitation: 5.5 in
Warmest recorded: 80°F
Coldest recorded: 27°F

Expect March days in Portland, Oregon to top out around 53°F and cool to about 38°F overnight, with roughly 19 days of measurable rain across the month. In recent years March has ranged from 27°F to 80°F.

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