Yes

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

Why? Because it's quite chilly!
44°F7°C & Cloudy

Wind is 1 mph2 km/h from the East, gusting to 4 mph7 km/h
November 8
8am44°F7°C2 mph3 km/h EastMostly Cloudy
9am43°F6°C2 mph4 km/h NortheastPartly Cloudy
10am42°F6°C3 mph5 km/h NortheastMostly Clear
11am42°F5°C3 mph5 km/h NortheastMostly Clear
12pm41°F5°C3 mph5 km/h NortheastMostly Clear
1pm41°F5°C4 mph7 km/h NortheastMostly Cloudy
2pm41°F5°C3 mph5 km/h NorthPartly Cloudy
3pm42°F5°C3 mph5 km/h NorthPartly Cloudy
4pm42°F6°C3 mph5 km/h NortheastPartly Cloudy
5pm45°F7°C3 mph5 km/h NortheastPartly Cloudy
6pm48°F9°C4 mph6 km/h NortheastPartly Cloudy
7pm50°F10°C4 mph6 km/h NorthPartly Cloudy
DateLowHighWindDayNight
November 744°F7°C55°F13°C3 mph5 km/h from SouthMostly ClearMostly Cloudy
November 841°F5°C56°F13°C4 mph6 km/h from NorthMostly CloudyMostly Cloudy
November 946°F8°C61°F16°C4 mph7 km/h from SouthMostly CloudyDrizzle
November 1048°F9°C58°F15°C8 mph13 km/h from SouthMostly CloudyMostly Cloudy
November 1145°F7°C53°F11°C4 mph6 km/h from NorthMostly CloudyCloudy
November 1246°F8°C54°F12°C4 mph6 km/h from NorthwestDrizzleDrizzle
November 1346°F8°C53°F12°C4 mph6 km/h from SouthDrizzleRain

Yes

Low of 41°F5°C, High of 56°F14°C
Wind: 4 mph6 km/h
Precipitation: None

Support This Page