Average temperatures, rainfall and packing tips for Seattle, United States in May
May in Seattle is typically mild, with average daytime highs around 17°C and nights near 8°C. Temperature-wise it sits mid-range for Seattle (the 5th warmest month).
Expect some rain: around 55 mm falls in Seattle during May on average.
If your dates are flexible, the most comfortable months in Seattle are usually June, July, August and September.
← Seattle weather tomorrow (live)
In May, Seattle averages a daytime high of about 17°C and a night-time low of around 8°C, based on recent historical data.
Expect some rain: around 55 mm falls in Seattle during May on average.
May is a workable time to visit Seattle, with mild days - just pack accordingly. If your dates are flexible, the most comfortable months in Seattle are usually June, July, August and September.