No

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

66°F19°C & Cloudy

Wind is 7 mph11 km/h from the Northwest, gusting to 17 mph27 km/h
July 4
12am65°F19°C7 mph11 km/h NorthwestPartly Cloudy
1am63°F17°C6 mph10 km/h NorthwestMostly Clear
2am60°F16°C5 mph8 km/h NorthwestMostly Cloudy
3am59°F15°C4 mph7 km/h NorthwestMostly Cloudy
4am57°F14°C3 mph5 km/h NorthwestMostly Cloudy
5am56°F13°C3 mph4 km/h WestMostly Cloudy
6am56°F13°C2 mph3 km/h NorthwestMostly Cloudy
7am55°F13°C3 mph4 km/h NorthwestMostly Cloudy
8am54°F12°C3 mph4 km/h NorthwestCloudy
9am54°F12°C2 mph4 km/h NorthwestCloudy
10am56°F13°C2 mph3 km/h NorthwestCloudy
11am57°F14°C2 mph2 km/h NorthwestCloudy
DateLowHighWindDayNight
July 355°F13°C76°F24°C3 mph6 km/h from NorthClearMostly Cloudy
July 454°F12°C74°F23°C4 mph6 km/h from NorthwestMostly CloudyMostly Clear
July 551°F11°C79°F26°C5 mph8 km/h from NorthClearClear
July 653°F12°C82°F28°C7 mph11 km/h from NorthClearClear
July 757°F14°C87°F30°C7 mph11 km/h from NorthClearClear
July 861°F16°C89°F32°C5 mph8 km/h from NorthwestClearMostly Clear
July 960°F15°C82°F28°C5 mph7 km/h from NorthwestPartly CloudyMostly Clear

Yes

Low of 54°F12°C, High of 74°F24°C
Wind: 4 mph6 km/h
Precipitation: None

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