Yes

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

Why? Because sorry, it's too cool for just a hoodie!
58°F15°C & Clear

Wind is 2 mph3 km/h from the North, gusting to 4 mph6 km/h
July 1
8am58°F14°C2 mph3 km/h NorthClear
9am58°F15°C2 mph3 km/h NorthClear
10am61°F16°C2 mph3 km/h NorthClear
11am64°F18°C2 mph3 km/h NorthClear
12pm67°F20°C3 mph5 km/h NorthwestClear
1pm70°F21°C4 mph6 km/h NorthwestClear
2pm73°F23°C5 mph8 km/h NorthwestClear
3pm77°F25°C5 mph9 km/h NorthwestClear
4pm79°F26°C7 mph11 km/h NorthwestClear
5pm80°F27°C8 mph13 km/h NorthClear
6pm81°F27°C8 mph14 km/h NorthClear
7pm81°F27°C9 mph14 km/h NorthClear
DateLowHighWindDayNight
July 158°F14°C81°F27°C6 mph10 km/h from NorthClearMostly Clear
July 256°F14°C76°F24°C5 mph8 km/h from WestMostly ClearMostly Cloudy
July 355°F13°C70°F21°C5 mph7 km/h from NorthPartly CloudyPartly Cloudy
July 454°F12°C72°F22°C4 mph7 km/h from NorthwestPartly CloudyMostly Cloudy
July 554°F12°C73°F23°C4 mph6 km/h from SouthwestPartly CloudyMostly Cloudy
July 655°F13°C74°F24°C5 mph8 km/h from NorthMostly ClearClear
July 756°F14°C78°F26°C7 mph11 km/h from NorthClearMostly Clear

Yes

Low of 56°F14°C, High of 76°F25°C
Wind: 5 mph8 km/h
Precipitation: None

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