Yes

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

Why? Because the rain is just enough to ruin your hairstyle but not your mood and the air feels like the cozy middle ground between summer and winter!
53°F12°C & Rain

Wind is 6 mph9 km/h from the Southeast, gusting to 12 mph19 km/h
November 1
1pm53°F12°C7 mph11 km/h SoutheastRain
2pm55°F13°C9 mph14 km/h SouthRain
3pm56°F14°C13 mph20 km/h SouthRain
4pm58°F15°C15 mph24 km/h SouthRain
5pm59°F15°C16 mph26 km/h SouthDrizzle
6pm59°F15°C15 mph25 km/h SouthwestDrizzle
7pm59°F15°C15 mph24 km/h SouthwestDrizzle
8pm57°F14°C12 mph20 km/h SouthwestPartly Cloudy
9pm57°F14°C10 mph16 km/h SouthwestPartly Cloudy
10pm56°F13°C10 mph16 km/h SouthwestMostly Cloudy
11pm54°F12°C9 mph14 km/h SouthwestMostly Cloudy
November 2
12am53°F12°C6 mph9 km/h SouthwestMostly Cloudy
DateLowHighWindDayNight
November 148°F9°C59°F15°C11 mph18 km/h from SouthwestRainDrizzle
November 243°F6°C53°F12°C4 mph7 km/h from SouthMostly CloudyCloudy
November 341°F5°C54°F12°C2 mph4 km/h from NorthMostly CloudyMostly Cloudy
November 439°F4°C55°F13°C4 mph6 km/h from EastMostly CloudyRain
November 549°F10°C56°F13°C9 mph14 km/h from SouthRainDrizzle
November 648°F9°C54°F12°C7 mph12 km/h from SoutheastRainRain
November 743°F6°C51°F11°C8 mph13 km/h from SouthDrizzleMostly Cloudy

Yes

Low of 43°F6°C, High of 54°F12°C
Wind: 4 mph7 km/h
Precipitation: None

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