Yes

you do need a jacket based on the weather in St Helens, OR, USA 1 second ago

Why? Because it's cold enough that makes you wish you had a hat, but you're still too proud to admit it!
33°F0°C & Cloudy

Wind is 3 mph5 km/h from the Southeast, gusting to 11 mph17 km/h
February 14
12am33°F0°C3 mph5 km/h SoutheastCloudy
1am33°F0°C3 mph5 km/h SoutheastSnow
2am32°F0°C3 mph5 km/h SouthwestSnow
3am33°F0°C4 mph6 km/h WestSnow
4am32°F0°C4 mph6 km/h WestSnow
5am32°F0°C3 mph5 km/h WestSnow
6am32°F0°C3 mph5 km/h NorthwestSnow
7am32°F-0°C3 mph4 km/h NorthwestSnow
8am32°F-0°C2 mph3 km/h NorthwestSnow
9am32°F-0°C2 mph3 km/h NorthwestSnow
10am31°F-0°C2 mph2 km/h WestCloudy
11am32°F-0°C2 mph3 km/h SouthwestCloudy
DateLowHighWindDayNight
February 1327°F-3°C34°F1°C3 mph5 km/h from EastSnowSnow
February 1431°F-0°C40°F4°C4 mph6 km/h from SoutheastMostly CloudyCloudy
February 1533°F1°C43°F6°C4 mph6 km/h from SoutheastDrizzleRain
February 1639°F4°C46°F8°C6 mph10 km/h from SoutheastRainRain
February 1741°F5°C49°F10°C3 mph6 km/h from SoutheastDrizzleCloudy
February 1841°F5°C50°F10°C4 mph6 km/h from SoutheastDrizzleRain
February 1939°F4°C46°F8°C5 mph7 km/h from SoutheastRainDrizzle

Yes

Low of 31°F-1°C, High of 40°F5°C
Wind: 4 mph6 km/h
Precipitation: None

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