Yes

you do need a jacket based on the weather in Seattle, WA 98121, USA 1 second ago

Why? Because it's cold. simple as that.
49°F10°C & Cloudy

Wind is 6 mph9 km/h from the SE, gusting to 16 mph25 km/h
April 25
9am49°F10°C6 mph10 km/h SEDrizzle
10am50°F10°C7 mph11 km/h SDrizzle
11am50°F10°C8 mph12 km/h SDrizzle
12pm51°F11°C8 mph14 km/h SDrizzle
1pm52°F11°C9 mph15 km/h SDrizzle
2pm52°F11°C10 mph16 km/h SDrizzle
3pm53°F12°C11 mph17 km/h SDrizzle
4pm53°F12°C12 mph19 km/h SDrizzle
5pm54°F12°C12 mph19 km/h SDrizzle
6pm54°F12°C11 mph18 km/h SDrizzle
7pm54°F12°C10 mph16 km/h SDrizzle
8pm54°F12°C9 mph14 km/h SEDrizzle
DateLowHighWindDayNight
April 2549°F9°C54°F12°C10 mph16 km/h from SDrizzleDrizzle
April 2648°F9°C58°F14°C8 mph13 km/h from SMostly CloudyMostly Cloudy
April 2748°F9°C55°F13°C11 mph18 km/h from SCloudyCloudy
April 2846°F8°C55°F13°C13 mph21 km/h from SWMostly CloudyPartly Cloudy
April 2942°F5°C53°F12°C7 mph11 km/h from SWMostly CloudyMostly Cloudy
April 3041°F5°C57°F14°C4 mph7 km/h from SWMostly CloudyMostly Cloudy
May 146°F8°C59°F15°C7 mph11 km/h from WRainThunderstorms

Yes

Low of 48°F9°C, High of 58°F15°C
Wind: 8 mph13 km/h
Precipitation: 72% rain

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