Bainbridge Island weather in brief
Bainbridge Island weather follows the pattern of the Puget Sound region: mild temperatures all year, a dry summer and a wet stretch from November to January. The monthly values below are averages of the Seattle-Tacoma station for 1991 to 2020. Expect small differences on the water.
These are typical values and do not predict any given week. If you want the best odds of dry days, plan for July or August. The Bainbridge Island day trips from Seattle page has ideas for those clear days.
Our pick: a ride in the drier months
An e-bike tour suits the drier months of July and August.
Hand-picked tours, booked through GetYourGuide. Prices are indicative starting prices in US dollars (as of October 2026). Tap a tour for live availability and the current price in your currency.
Guided trips on and around Bainbridge Island
Day trips, wine tours and sightseeing options for the weather you get.
Bainbridge Island weather by month
Typical daily high, daily low and rainfall, station Seattle-Tacoma, 1991 to 2020. Temperatures in °C, rainfall in millimeters.
| Month | High | Low | Rainfall |
|---|---|---|---|
| January | 8.9 °C | 3.2 °C | 146.8 mm |
| February | 10.2 °C | 3.2 °C | 95.5 mm |
| March | 12.3 °C | 4.4 °C | 105.9 mm |
| April | 15.2 °C | 6.3 °C | 80.8 mm |
| May | 19.1 °C | 9.3 °C | 47.8 mm |
| June | 21.7 °C | 11.7 °C | 36.8 mm |
| July | 25.2 °C | 13.8 °C | 15.2 mm |
| August | 25.3 °C | 14.0 °C | 24.6 mm |
| September | 22.0 °C | 12.0 °C | 40.9 mm |
| October | 15.8 °C | 8.3 °C | 99.3 mm |
| November | 11.2 °C | 4.9 °C | 160.3 mm |
| December | 8.3 °C | 2.8 °C | 145.3 mm |
For most visitors who want dry weather and comfortable walking temperatures, July and August are the safest choice. May, June and September are also fairly dry and a little cooler than midsummer, which suits long walks.
Best time to visit Bainbridge Island by season
What each season is good for.
Summer: July and August
The driest and warmest months of the year. The Bloedel Reserve is open Tuesday to Sunday from 9 a.m. to 6 p.m. from 30 June, and the farmers market runs on Saturdays. This is also the season for the parks, as described on the parks page.
Late spring and early autumn
May, June and September bring far less rain than October to April and cooler highs than midsummer. Bloedel keeps longer hours from 19 May, with its autumn hours starting on 1 September.
Late autumn and winter
From November to January the rain is heaviest, and highs run between about 8 and 11 °C. The Bloedel Reserve closes earlier, at 4 p.m., from 3 November 2026. Museums are a dry alternative: the Museum of Art is open every day.
Early spring
February to April are mild but still wet, with lows between 3.2 and 6.3 °C. Bloedel's longer spring hours begin on 31 March.
Planning around the weather
The weather is one factor, and some of the island's places have their own seasons. The Bloedel Reserve has summer and winter hours. The outdoor grounds of the Japanese American Exclusion Memorial follow daylight, while the visitor center keeps its own days and hours. The farmers market runs only from April to November.
Pack layers for any month. A rain jacket is a sensible item from autumn to spring. No table can promise sun, snow or any particular day, so look at a forecast a few days ahead. The ferry page explains how to check the timetable.
Plan the rest of your trip
Pick a place that suits the season.
Bainbridge Island weather: frequently asked questions
Where do the monthly values come from?
They are averages of the Seattle-Tacoma station for 1991 to 2020. For a forecast, use a current weather service for your travel dates.
What is the best month to visit Bainbridge Island?
July and August are the driest and warmest months, with typical highs around 25 °C. May, June and September are also fairly dry.
How rainy is Bainbridge Island?
November has the most rain in the table, with typical totals around 160 mm. July is the driest, at about 15 mm. The values are averages of the Seattle-Tacoma station, 1991 to 2020.
How cold does it get in winter?
Typical winter highs are between about 8 and 10 °C and lows around 3 °C in December to February. The table does not predict snow or frost on any given day.
Should I bring a rain jacket?
Yes, from autumn through spring. Even in summer, bring a light layer for the water.
Does the weather affect the garden and parks?
The Bloedel Reserve has summer and winter hours, and the outdoor grounds of the memorial follow daylight. Check each place before you go.