Seattle Weather in September

September in Seattle averages 22°C (72°F) during the day and 12°C (54°F) at night. The excellent conditions and moderate rainfall make it a solid month to visit.

Rainfall in Seattle in September

Analyzing past climate data, one can expect approximately 9 days of rain, averaging 49 mm (1.9 in). A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.

Temperature in Seattle in September

Weather in Seattle is at its excellent in September. Highs reach 22°C (72°F), while nights settle around 12°C (54°F). September is part of the summer season. Conditions are often most pleasant around the middle of the day. Nights drop to around 12°C (54°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

Sunshine in Seattle in September

Expect a lot of sunshine this month, with about 220 hours of sun. These sunny conditions add to the overall experience.

Wind Speed in Seattle in September

Wind speeds average 4 m/s (8 knots) during September. At this speed, expect moderate winds that can raise dust and move small branches. Since this is an average, some days have gentle light winds while others experience stronger breezes that are quite noticeable.

If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Seattle.