Yes

you do need a jacket based on the weather in Seattle (Central Business District), Washington, United States 1 second ago

Why? Because sorry, it's too cool for just a hoodie!
52°F11°C & Cloudy

Wind is 5 mph8 km/h from the South, gusting to 9 mph14 km/h
May 11
4am51°F11°C5 mph8 km/h SouthCloudy
5am50°F10°C5 mph8 km/h SouthCloudy
6am50°F10°C6 mph9 km/h SouthCloudy
7am49°F9°C6 mph9 km/h SouthCloudy
8am49°F9°C5 mph8 km/h SouthCloudy
9am49°F10°C5 mph8 km/h SouthCloudy
10am50°F10°C5 mph8 km/h SouthCloudy
11am52°F11°C6 mph10 km/h SouthCloudy
12pm53°F11°C6 mph9 km/h SouthCloudy
1pm55°F13°C5 mph9 km/h SouthCloudy
2pm57°F14°C5 mph9 km/h SouthCloudy
3pm59°F15°C6 mph10 km/h SouthwestCloudy
DateLowHighWindDayNight
May 1149°F9°C61°F16°C7 mph11 km/h from SouthwestDrizzleDrizzle
May 1248°F9°C61°F16°C3 mph5 km/h from SouthwestDrizzleMostly Cloudy
May 1349°F10°C64°F18°C6 mph9 km/h from SouthCloudyMostly Cloudy
May 1450°F10°C61°F16°C6 mph9 km/h from SouthwestDrizzleMostly Cloudy
May 1547°F8°C59°F15°C5 mph9 km/h from SouthCloudyDrizzle
May 1649°F9°C60°F16°C5 mph9 km/h from SouthDrizzleRain
May 1750°F10°C61°F16°C4 mph7 km/h from WestDrizzleMostly Cloudy

Yes

Low of 48°F9°C, High of 61°F16°C
Wind: 3 mph5 km/h
Precipitation: 32% rain

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