Yes

you do need a jacket based on the weather in Portland (Corbett - Terwilliger - Lair Hill), Oregon, United States 1 second ago

Why? Because it's cold. simple as that.
44°F7°C & Mostly Cloudy

Wind is 8 mph13 km/h from the S, gusting to 21 mph34 km/h
March 28
7am44°F7°C9 mph14 km/h SCloudy
8am43°F6°C8 mph13 km/h SCloudy
9am43°F6°C8 mph14 km/h SCloudy
10am43°F6°C9 mph15 km/h SDrizzle
11am44°F6°C11 mph17 km/h SCloudy
12pm44°F7°C12 mph20 km/h SCloudy
1pm46°F8°C14 mph22 km/h SDrizzle
2pm47°F8°C15 mph24 km/h SDrizzle
3pm48°F9°C15 mph25 km/h SWindy
4pm49°F9°C15 mph25 km/h SDrizzle
5pm49°F9°C16 mph25 km/h SDrizzle
6pm49°F10°C15 mph24 km/h SWindy
DateLowHighWindDayNight
March 2843°F6°C50°F10°C14 mph22 km/h from SDrizzleCloudy
March 2941°F5°C60°F15°C6 mph9 km/h from NMostly CloudyMostly Clear
March 3041°F5°C63°F17°C7 mph12 km/h from NClearClear
March 3140°F5°C64°F18°C4 mph6 km/h from NMostly ClearMostly Clear
April 142°F6°C65°F19°C2 mph3 km/h from NMostly ClearMostly Clear
April 245°F7°C70°F21°C2 mph3 km/h from NWMostly ClearDrizzle
April 343°F6°C55°F13°C7 mph12 km/h from NWDrizzlePartly Cloudy

Yes

Low of 41°F5°C, High of 60°F16°C
Wind: 6 mph9 km/h
Precipitation: None

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