Portland, Oregon weather in August

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

Average high: 85°F
Average low: 60°F
Rainy days: ~3 per month
Total precipitation: 0.6 in
Warmest recorded: 106°F
Coldest recorded: 49°F

Expect August days in Portland, Oregon to top out around 85°F and cool to about 60°F overnight, with roughly 3 days of measurable rain across the month. In recent years August has ranged from 49°F to 106°F.

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