Yes

you do need a jacket based on the weather in St Helens, OR 97051, USA 1 second ago

Why? Because there's a refreshing nip in the air.
49°F10°C & Cloudy

Wind is 12 mph19 km/h from the S, gusting to 29 mph47 km/h
March 28
5pm49°F10°C12 mph20 km/h SRain
6pm49°F10°C12 mph19 km/h SDrizzle
7pm50°F10°C10 mph17 km/h SDrizzle
8pm49°F9°C10 mph17 km/h SDrizzle
9pm48°F9°C10 mph16 km/h SDrizzle
10pm47°F8°C9 mph15 km/h SCloudy
11pm46°F8°C9 mph14 km/h SCloudy
March 29
12am45°F7°C9 mph14 km/h SCloudy
1am44°F7°C8 mph13 km/h SCloudy
2am44°F7°C10 mph16 km/h SDrizzle
3am44°F6°C8 mph13 km/h SCloudy
4am43°F6°C8 mph14 km/h SDrizzle
DateLowHighWindDayNight
March 2842°F5°C50°F10°C10 mph16 km/h from SRainDrizzle
March 2940°F5°C59°F15°C4 mph7 km/h from NEMostly CloudyClear
March 3040°F5°C62°F17°C7 mph11 km/h from NWMostly ClearMostly Clear
March 3141°F5°C62°F17°C5 mph8 km/h from NMostly ClearMostly Clear
April 139°F4°C64°F18°C2 mph4 km/h from NMostly ClearMostly Clear
April 244°F7°C67°F19°C4 mph6 km/h from NWMostly ClearMostly Cloudy
April 339°F4°C51°F11°C7 mph11 km/h from NWDrizzleDrizzle

Yes

Low of 40°F5°C, High of 58°F15°C
Wind: 4 mph7 km/h
Precipitation: None

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