Yes

you do need a jacket based on the weather in Oregon 97078, USA 1 second ago

Why? Because looks like it's raining and it's cold enough that makes you wish you had a hat, but you're still too proud to admit it!
44°F7°C & Rain

Wind is 4 mph7 km/h from the East, gusting to 12 mph20 km/h
December 13
5pm44°F7°C5 mph8 km/h EastRain
6pm44°F7°C6 mph9 km/h EastRain
7pm44°F7°C6 mph9 km/h EastRain
8pm44°F7°C6 mph9 km/h EastRain
9pm44°F7°C5 mph9 km/h SoutheastRain
10pm44°F7°C5 mph9 km/h SoutheastRain
11pm43°F6°C6 mph9 km/h SoutheastRain
December 14
12am43°F6°C7 mph11 km/h SoutheastRain
1am43°F6°C8 mph12 km/h SouthDrizzle
2am44°F7°C9 mph15 km/h SouthDrizzle
3am45°F7°C11 mph18 km/h SouthCloudy
4am45°F7°C12 mph19 km/h SouthCloudy
DateLowHighWindDayNight
December 1339°F4°C45°F7°C4 mph7 km/h from EastRainRain
December 1440°F4°C49°F9°C9 mph14 km/h from SouthwestDrizzleDrizzle
December 1537°F3°C48°F9°C4 mph6 km/h from SoutheastMostly CloudyRain
December 1641°F5°C50°F10°C5 mph8 km/h from SouthRainRain
December 1743°F6°C51°F10°C6 mph10 km/h from SouthCloudyMostly Cloudy
December 1841°F5°C50°F10°C5 mph7 km/h from SouthCloudyMostly Cloudy
December 1938°F3°C52°F11°C4 mph6 km/h from NortheastMostly CloudyCloudy

Yes

Low of 40°F5°C, High of 49°F10°C
Wind: 9 mph14 km/h
Precipitation: 73% rain

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