Weather in Sammamish in September
Sammamish, United States averages a high of 20.8°C (69.4°F) and low of 11.3°C (52.3°F) in September, with 10 rain days and 9.8 hours of daily sunshine. Travel score: 76.1/100 (Good). The best time to visit Sammamish is July.
High
21°C69°F
Low
11°C52°F
🌧️
10
rain days
☀️
9.8
hrs/day sunshine
💧
79%
humidity
76— Good
September in Sammamish is mild and occasionally wet — good for most activities.
What are the average temperatures in Sammamish?
How much does it rain in Sammamish in September?
Sammamish receives an average of 89.9mm of rainfall across 10 rainy days in September. The annual total is 1646.2mm.
What should I pack for Sammamish in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
🧥
Mix of light and warm layers
Mild temperatures around 21°C
🧴
Sunscreen SPF 30+
10 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Recommended
🧥
Light rain jacket
Some rainy days expected (10 days)
☔
Umbrella
Be prepared for occasional showers
Traveling to United States in September?
Don't let a public holiday surprise you — restaurants, shops, and attractions may be closed.
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Data based on 1994–2024 averages · Last updated: 2024-12-31