Seattle, Washington weather in May

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

Average high: 63°F
Average low: 48°F
Rainy days: ~11 per month
Total precipitation: 2.2 in
Warmest recorded: 84°F
Coldest recorded: 41°F

Expect May days in Seattle, Washington to top out around 63°F and cool to about 48°F overnight, with roughly 11 days of measurable rain across the month. In recent years May has ranged from 41°F to 84°F.

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Current Seattle, Washington forecast → · Historical data by Open-Meteo (ERA5).