Yes

you do need a jacket based on the weather in River Hills, WI 53209, USA 1 second ago

Why? Because the air feels like the cozy middle ground between summer and winter and there are strong winds blowing out there!
55°F13°C & Windy

Wind is 16 mph26 km/h from the West, gusting to 27 mph44 km/h
May 17
2pm55°F13°C15 mph24 km/h WestWindy
3pm60°F16°C17 mph27 km/h WestWindy
4pm60°F16°C17 mph27 km/h WestWindy
5pm62°F16°C17 mph27 km/h WestWindy
6pm62°F17°C16 mph26 km/h WestWindy
7pm62°F17°C16 mph25 km/h WestWindy
8pm61°F16°C14 mph23 km/h NorthwestMostly Clear
9pm58°F14°C14 mph22 km/h NorthwestPartly Cloudy
10pm56°F13°C13 mph21 km/h NorthwestMostly Clear
11pm55°F13°C13 mph21 km/h NorthwestPartly Cloudy
May 18
12am54°F12°C12 mph20 km/h NorthwestPartly Cloudy
1am53°F12°C12 mph19 km/h NorthwestPartly Cloudy
DateLowHighWindDayNight
May 1751°F10°C62°F17°C13 mph22 km/h from WestMostly CloudyPartly Cloudy
May 1843°F6°C56°F13°C8 mph14 km/h from NortheastMostly CloudyPartly Cloudy
May 1941°F5°C52°F11°C14 mph23 km/h from NortheastMostly CloudyWindy
May 2045°F7°C50°F10°C18 mph28 km/h from EastRainRain
May 2144°F7°C51°F11°C16 mph26 km/h from NortheastWindyMostly Cloudy
May 2243°F6°C56°F13°C11 mph18 km/h from NorthDrizzleDrizzle
May 2345°F7°C59°F15°C7 mph12 km/h from NortheastMostly CloudyMostly Cloudy

Yes

Low of 43°F6°C, High of 55°F13°C
Wind: 8 mph14 km/h
Precipitation: None

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