Early autumn · Weather & things to do
Bainbridge Island in September
Bainbridge Island cools off: highs slip to 69°F (21°C), from 75°F in August, with lows of 52°F (11°C) and about 2.3 in (58 mm) of rain.
At 90/100 for comfort (2nd of 12), it's one of the best months to visit.
- Avg high
- 69°F (21°C)
- Avg low
- 52°F (11°C)
- Rain
- 2.3 in (58 mm)
- Humidity
- 78%
- Cloud cover
- 53%
- Daylight
- ~12 h 19 min
- Comfort score
- 90/100 · Great
What September feels like
Expect mild afternoons around 69°F (21°C), good for long walks.
After dark, temperatures fall to about 52°F (11°C).
Rain is moderate at about 2.3 in (58 mm) for the month.
Plan around September
September is one of Bainbridge Island's best months on the climate data.
- Last dry month before the rain picks up: October brings 4.9 in (125 mm).
- Last of the best-scoring months: by October, the score drops to 69/100.
- Comfort holds steady from August (90 → 90/100).
- September sits inside the May – Sep window our Puget Sound Islands route recommends.
What to pack for September
- A warm layer for eveningsnights drop to 52°F
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in Bainbridge Island in September
With conditions on your side, the picks below favor time outside.
Bloedel Reserve
150-acre gardens and forest, including a Japanese garden and moss garden.
Why now Our curated notes say it's best spring–fall.
Fort Ward Park
Wooded shoreline park with WWII-era batteries and Rich Passage views.
Why now September scores 90/100 for comfort, good conditions for being outside.
Eleven Winery Tasting Room
Winslow tasting room of a Bainbridge winery founded in 2004.
Blackbird Bakery
Winslow bakery and coffee shop since 1999.
Harbour Public House
Pub on Eagle Harbor marina with local seafood and beer.
Nearby in September
- Seattle in September~9 mi · highs 69°F, 2.3 in rain · similar daytime temperatures, about as wet
- Olympic NP in September~52 mi · highs 53°F, 3.4 in rain · 9°C (16°F) cooler by day, wetter
- Snoqualmie Pass in September~54 mi · highs 62°F, 3.0 in rain · 4°C (7°F) cooler by day, wetter
- San Juan Island in September~67 mi · highs 65°F, 2.0 in rain · 3°C (5°F) cooler by day, about as wet
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Bainbridge Island in September: quick answers
Is September a good time to visit Bainbridge Island?
Yes. On the climate data it's one of the best months, scoring 90/100. Expect highs of 69°F (21°C) and 2.3 in (58 mm) of rain. September is inside the May – Sep window our Puget Sound Islands route recommends.
How hot is Bainbridge Island in September?
Average highs are 69°F (21°C) and average lows 52°F (11°C), making it the 3rd-warmest month by daytime highs.
Does it rain a lot in Bainbridge Island in September?
Not much: about 2.3 in (58 mm) of rain falls across September on average, the 4th-driest month of the year. The annual total is about 48.4 in (1230 mm).
What should I pack for Bainbridge Island in September?
Bring a warm layer for evenings (nights drop to 52°F) and comfortable walking shoes (most places below are best reached on foot or with short walks).
More on Bainbridge Island
Routes in season in September
- Puget Sound Islands May – Sep
Planning Bainbridge Island in September?
Share this September plan with your group, poll everyone on dates and keep the packing list in one place.