Yes

you do need a jacket based on the weather in Seattle, WA 98117, USA 1 second ago

Why? Because too cold for just a hoodie, too warm for a parka!
46°F8°C & Mostly Cloudy

Wind is 8 mph13 km/h from the North, gusting to 16 mph25 km/h
October 13
8am46°F8°C9 mph14 km/h NorthDrizzle
9am46°F8°C9 mph14 km/h NorthMostly Cloudy
10am47°F8°C10 mph16 km/h NorthCloudy
11am46°F8°C10 mph17 km/h NorthMostly Cloudy
12pm46°F8°C10 mph16 km/h NorthMostly Cloudy
1pm45°F7°C10 mph16 km/h NorthPartly Cloudy
2pm45°F7°C11 mph17 km/h NorthPartly Cloudy
3pm45°F7°C10 mph16 km/h NorthMostly Clear
4pm47°F8°C11 mph18 km/h NorthClear
5pm49°F10°C12 mph20 km/h NorthClear
6pm52°F11°C13 mph21 km/h NorthClear
7pm54°F12°C14 mph22 km/h NorthClear
DateLowHighWindDayNight
October 1345°F7°C57°F14°C13 mph21 km/h from NorthClearClear
October 1444°F7°C58°F15°C9 mph15 km/h from NorthClearClear
October 1543°F6°C61°F16°C2 mph3 km/h from WestClearClear
October 1646°F8°C59°F15°C6 mph9 km/h from SouthPartly CloudyMostly Cloudy
October 1749°F9°C58°F15°C2 mph4 km/h from NorthMostly CloudyMostly Cloudy
October 1849°F9°C57°F14°C8 mph14 km/h from SouthDrizzleRain
October 1945°F7°C55°F13°C9 mph15 km/h from SouthwestDrizzleDrizzle

Yes

Low of 45°F7°C, High of 58°F15°C
Wind: 9 mph15 km/h
Precipitation: None

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