Yes

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

Why? Because it's pretty chilly and it's so windy, even the squirrels are holding onto branches for dear life!
58°F15°C & Mostly Clear

Wind is 9 mph14 km/h from the Northwest, gusting to 19 mph31 km/h
May 25
2am57°F14°C8 mph13 km/h NorthwestClear
3am55°F13°C7 mph11 km/h NorthwestClear
4am53°F12°C4 mph7 km/h NorthwestClear
5am52°F11°C3 mph5 km/h NorthwestClear
6am50°F10°C4 mph6 km/h NorthwestMostly Clear
7am49°F10°C4 mph6 km/h NorthwestMostly Clear
8am47°F9°C3 mph5 km/h NorthwestPartly Cloudy
9am48°F9°C3 mph4 km/h NorthwestMostly Cloudy
10am51°F10°C2 mph4 km/h NorthwestMostly Cloudy
11am54°F12°C2 mph3 km/h NorthMostly Cloudy
12pm56°F13°C3 mph5 km/h SoutheastMostly Cloudy
1pm59°F15°C4 mph6 km/h SoutheastMostly Cloudy
DateLowHighWindDayNight
May 2447°F8°C79°F26°C2 mph3 km/h from NortheastClearMostly Clear
May 2547°F8°C69°F21°C4 mph7 km/h from SouthMostly CloudyDrizzle
May 2651°F11°C67°F19°C4 mph7 km/h from WestDrizzlePartly Cloudy
May 2746°F8°C77°F25°C6 mph9 km/h from NorthPartly CloudyClear
May 2854°F12°C84°F29°C4 mph7 km/h from SouthwestClearPartly Cloudy
May 2953°F12°C72°F22°C5 mph8 km/h from NorthwestMostly ClearMostly Clear
May 3051°F10°C81°F27°C7 mph11 km/h from NorthwestClearClear

Yes

Low of 47°F9°C, High of 70°F21°C
Wind: 4 mph7 km/h
Precipitation: None

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