Yes

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

Why? Because it's pretty chilly.
52°F11°C & Cloudy

Wind is 10 mph16 km/h from the S, gusting to 24 mph38 km/h
April 26
1am51°F11°C11 mph17 km/h SDrizzle
2am51°F10°C11 mph17 km/h SDrizzle
3am50°F10°C11 mph17 km/h SDrizzle
4am50°F10°C10 mph16 km/h SCloudy
5am50°F10°C9 mph15 km/h SCloudy
6am49°F10°C9 mph14 km/h SCloudy
7am49°F10°C8 mph12 km/h SCloudy
8am49°F9°C7 mph11 km/h SCloudy
9am48°F9°C6 mph10 km/h SCloudy
10am49°F9°C6 mph9 km/h SCloudy
11am50°F10°C6 mph10 km/h SCloudy
12pm51°F10°C6 mph10 km/h SCloudy
DateLowHighWindDayNight
April 2548°F9°C54°F12°C4 mph7 km/h from SRainRain
April 2648°F9°C60°F16°C5 mph8 km/h from SDrizzleDrizzle
April 2749°F9°C54°F12°C11 mph17 km/h from SCloudyCloudy
April 2845°F7°C54°F12°C13 mph20 km/h from SWCloudyDrizzle
April 2942°F6°C53°F12°C7 mph11 km/h from SWMostly CloudyMostly Cloudy
April 3042°F6°C57°F14°C5 mph8 km/h from SWMostly CloudyPartly Cloudy
May 144°F7°C62°F17°C5 mph9 km/h from SDrizzleDrizzle

Yes

Low of 48°F9°C, High of 60°F16°C
Wind: 5 mph8 km/h
Precipitation: 59% rain

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