No

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

64°F18°C & Partly Cloudy

Wind is 4 mph7 km/h from the Northeast, gusting to 13 mph21 km/h
July 7
2am63°F17°C5 mph7 km/h NortheastPartly Cloudy
3am61°F16°C4 mph7 km/h NortheastPartly Cloudy
4am60°F16°C4 mph7 km/h NortheastMostly Clear
5am59°F15°C5 mph7 km/h NortheastMostly Clear
6am58°F14°C5 mph8 km/h NortheastClear
7am57°F14°C4 mph7 km/h NortheastClear
8am57°F14°C3 mph5 km/h NorthClear
9am57°F14°C3 mph5 km/h NorthClear
10am60°F15°C3 mph4 km/h NorthClear
11am63°F17°C3 mph5 km/h NorthClear
12pm66°F19°C4 mph6 km/h NorthClear
1pm69°F21°C5 mph8 km/h NorthClear
DateLowHighWindDayNight
July 654°F12°C77°F25°C3 mph5 km/h from NorthwestClearMostly Clear
July 757°F14°C81°F27°C6 mph10 km/h from NorthClearClear
July 859°F15°C83°F28°C4 mph6 km/h from WestClearMostly Cloudy
July 960°F15°C70°F21°C7 mph11 km/h from SouthwestDrizzleDrizzle
July 1056°F13°C73°F23°C4 mph7 km/h from NorthMostly ClearClear
July 1155°F13°C79°F26°C5 mph8 km/h from NorthMostly ClearPartly Cloudy
July 1259°F15°C78°F25°C4 mph7 km/h from WestPartly CloudyMostly Clear

Yes

Low of 57°F14°C, High of 81°F27°C
Wind: 6 mph10 km/h
Precipitation: None

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