Verdict: Good month
Seattle Weather in May
May is mild-to-cool in Seattle, topping out near 17°C (63°F) — comfortable with a layer on. Expect showers on roughly 12 days of the month — rarely trip-ruining, worth planning around. Overall, May is a solid month to visit Seattle.
Average high
17°C / 63°F
Average low
9°C / 48°F
Rain days
~12
Precipitation
63 mm
What to pack for Seattle in May
- Layers — t-shirts under a light jacket or sweater
- Rain gear is non-negotiable — expect rain on roughly 12 days
- Comfortable walking shoes — every guide on this site assumes you'll use them
May against the rest of the year
Warmest in Seattle: Jul (25°C / 77°F) · Coolest: Jan (8°C / 46°F) · Wettest: Jan (~20 rain days)
8°
3°
Jan
8°
3°
Feb
10°
3°
Mar
13°
5°
Apr
17°
9°
May
21°
12°
Jun
25°
15°
Jul
25°
15°
Aug
21°
13°
Sep
15°
9°
Oct
10°
5°
Nov
8°
3°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)