Yes

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

Why? Because it's quite chilly!
45°F7°C & Clear

Wind is 2 mph4 km/h from the Northwest, gusting to 3 mph5 km/h
January 28
7pm44°F7°C3 mph4 km/h NorthwestClear
8pm42°F5°C3 mph5 km/h NorthClear
9pm40°F4°C2 mph4 km/h NorthClear
10pm39°F4°C2 mph3 km/h NortheastClear
11pm38°F3°C2 mph3 km/h NortheastClear
January 29
12am37°F3°C1 mph2 km/h NortheastClear
1am36°F2°C1 mph2 km/h EastClear
2am35°F2°C1 mph2 km/h SoutheastMostly Clear
3am34°F1°C1 mph2 km/h SoutheastMostly Clear
4am34°F1°C2 mph3 km/h SoutheastMostly Clear
5am33°F1°C2 mph3 km/h SoutheastMostly Clear
6am33°F0°C2 mph3 km/h SouthMostly Clear
DateLowHighWindDayNight
January 2829°F-2°C45°F7°C2 mph2 km/h from NorthMostly ClearMostly Clear
January 2931°F-1°C46°F8°C3 mph4 km/h from SouthMostly ClearMostly Cloudy
January 3036°F2°C44°F7°C5 mph8 km/h from SouthCloudyRain
January 3139°F4°C49°F9°C13 mph21 km/h from SouthRainDrizzle
February 135°F2°C43°F6°C7 mph12 km/h from SouthDrizzleMostly Cloudy
February 234°F1°C41°F5°C5 mph7 km/h from SouthDrizzlePartly Cloudy
February 332°F0°C39°F4°C6 mph9 km/h from SouthwestPartly CloudySnow

Yes

Low of 30°F-1°C, High of 46°F8°C
Wind: 3 mph4 km/h
Precipitation: None

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