Seattle, Washington weather in March

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

Average high: 52°F
Average low: 39°F
Rainy days: ~15 per month
Total precipitation: 3.9 in
Warmest recorded: 69°F
Coldest recorded: 29°F

Expect March days in Seattle, Washington to top out around 52°F and cool to about 39°F overnight, with roughly 15 days of measurable rain across the month. In recent years March has ranged from 29°F to 69°F.

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