No

you don't need a jacket based on the weather in Seattle, WA, USA 1 second ago

65°F18°C & Cloudy

Wind is 11 mph18 km/h from the Southwest, gusting to 18 mph29 km/h
May 7
8pm64°F18°C12 mph19 km/h SouthwestMostly Cloudy
9pm61°F16°C9 mph15 km/h WestPartly Cloudy
10pm59°F15°C7 mph11 km/h WestMostly Cloudy
11pm57°F14°C5 mph9 km/h SoutheastMostly Cloudy
May 8
12am55°F13°C6 mph10 km/h SouthPartly Cloudy
1am52°F11°C6 mph9 km/h SouthMostly Clear
2am50°F10°C5 mph8 km/h SouthClear
3am48°F9°C6 mph9 km/h SouthMostly Clear
4am47°F8°C5 mph9 km/h SoutheastMostly Clear
5am46°F8°C5 mph8 km/h SoutheastMostly Clear
6am45°F7°C5 mph8 km/h SoutheastPartly Cloudy
7am45°F7°C5 mph7 km/h SoutheastPartly Cloudy
DateLowHighWindDayNight
May 748°F9°C65°F18°C5 mph8 km/h from SouthwestMostly CloudyPartly Cloudy
May 844°F7°C61°F16°C6 mph9 km/h from NorthPartly CloudyMostly Cloudy
May 947°F8°C67°F19°C4 mph7 km/h from NorthMostly CloudyCloudy
May 1050°F10°C62°F16°C7 mph11 km/h from SouthwestCloudyMostly Cloudy
May 1148°F9°C57°F14°C7 mph11 km/h from SouthwestDrizzleDrizzle
May 1246°F8°C58°F14°C4 mph6 km/h from SouthDrizzleMostly Cloudy
May 1347°F9°C61°F16°C9 mph14 km/h from SouthwestMostly CloudyMostly Cloudy

Yes

Low of 45°F7°C, High of 61°F16°C
Wind: 6 mph9 km/h
Precipitation: None

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