Yes

you do need a jacket based on the weather in Bremerton, WA, USA 1 second ago

Why? Because there's a refreshing nip in the air!
49°F9°C & Partly Cloudy

Wind is 3 mph5 km/h from the South, gusting to 8 mph13 km/h
September 26
10am48°F9°C4 mph6 km/h SouthPartly Cloudy
11am49°F10°C3 mph5 km/h SouthMostly Clear
12pm53°F12°C5 mph8 km/h SouthPartly Cloudy
1pm57°F14°C6 mph10 km/h SouthPartly Cloudy
2pm61°F16°C6 mph10 km/h SouthMostly Clear
3pm64°F18°C7 mph11 km/h SouthPartly Cloudy
4pm67°F19°C7 mph12 km/h SouthMostly Clear
5pm68°F20°C7 mph12 km/h SouthMostly Clear
6pm69°F21°C8 mph12 km/h SouthwestMostly Clear
7pm69°F21°C8 mph13 km/h SouthwestMostly Clear
8pm68°F20°C8 mph12 km/h SouthwestMostly Clear
9pm67°F19°C7 mph11 km/h SouthPartly Cloudy
DateLowHighWindDayNight
September 2647°F9°C69°F21°C6 mph10 km/h from SouthMostly ClearMostly Cloudy
September 2754°F12°C74°F23°C3 mph5 km/h from SouthPartly CloudyMostly Cloudy
September 2854°F12°C70°F21°C6 mph10 km/h from SouthwestDrizzleDrizzle
September 2953°F12°C64°F18°C6 mph10 km/h from SouthwestDrizzleDrizzle
September 3051°F10°C68°F20°C6 mph9 km/h from SouthDrizzleDrizzle
October 153°F12°C62°F17°C9 mph15 km/h from SouthDrizzleRain
October 254°F12°C64°F18°C13 mph21 km/h from SouthRainDrizzle

Yes

Low of 55°F13°C, High of 73°F23°C
Wind: 3 mph5 km/h
Precipitation: None

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