Yes

you do need a jacket based on the weather in Eugene, OR 97401, USA 1 second ago

Why? Because sorry, it's too cool for just a hoodie!
56°F14°C & Mostly Cloudy

Wind is 1 mph2 km/h from the Southeast, gusting to 4 mph7 km/h
September 11
10am57°F14°C2 mph4 km/h SoutheastCloudy
11am58°F15°C2 mph3 km/h EastCloudy
12pm60°F16°C2 mph3 km/h SouthwestCloudy
1pm62°F17°C2 mph3 km/h SouthwestCloudy
2pm66°F19°C4 mph7 km/h WestMostly Cloudy
3pm68°F20°C5 mph7 km/h WestCloudy
4pm70°F21°C4 mph7 km/h WestMostly Cloudy
5pm72°F22°C4 mph7 km/h WestPartly Cloudy
6pm73°F23°C4 mph7 km/h NorthwestPartly Cloudy
7pm74°F23°C4 mph7 km/h NorthwestPartly Cloudy
8pm74°F23°C4 mph7 km/h NorthwestPartly Cloudy
9pm73°F23°C4 mph6 km/h NorthwestPartly Cloudy
DateLowHighWindDayNight
September 1156°F14°C74°F23°C4 mph6 km/h from WestMostly CloudyMostly Clear
September 1254°F12°C77°F25°C4 mph6 km/h from NorthMostly ClearMostly Clear
September 1355°F13°C79°F26°C4 mph7 km/h from WestMostly ClearRain
September 1455°F13°C72°F22°C5 mph8 km/h from WestDrizzleClear
September 1550°F10°C74°F23°C6 mph9 km/h from NorthClearClear
September 1652°F11°C81°F27°C3 mph5 km/h from NorthwestClearClear
September 1754°F12°C76°F24°C5 mph8 km/h from NorthMostly ClearMostly Clear

Yes

Low of 55°F13°C, High of 77°F25°C
Wind: 4 mph6 km/h
Precipitation: None

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