Yes

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

Why? Because a jacket will keep you cozy, but you won't break a seat!
53°F12°C & Mostly Clear

Wind is 7 mph11 km/h from the Northeast, gusting to 16 mph25 km/h
May 31
2am53°F12°C7 mph12 km/h NortheastMostly Clear
3am51°F11°C6 mph10 km/h NortheastMostly Clear
4am50°F10°C5 mph9 km/h NortheastMostly Clear
5am48°F9°C6 mph10 km/h NortheastMostly Clear
6am47°F9°C5 mph9 km/h NortheastMostly Clear
7am48°F9°C6 mph9 km/h NortheastMostly Clear
8am50°F10°C7 mph11 km/h NortheastMostly Clear
9am51°F11°C8 mph13 km/h NortheastMostly Clear
10am54°F12°C8 mph12 km/h NortheastClear
11am57°F14°C7 mph12 km/h NortheastClear
12pm60°F16°C8 mph12 km/h NortheastClear
1pm62°F17°C7 mph12 km/h NortheastClear
DateLowHighWindDayNight
May 3147°F9°C67°F19°C6 mph10 km/h from NortheastClearMostly Clear
June 145°F7°C73°F23°C4 mph6 km/h from NorthwestClearMostly Clear
June 255°F13°C85°F29°C12 mph20 km/h from SouthwestMostly ClearPartly Cloudy
June 366°F19°C83°F28°C17 mph27 km/h from SouthwestWindyRain
June 457°F14°C68°F20°C9 mph14 km/h from NortheastRainRain
June 554°F12°C70°F21°C7 mph11 km/h from NortheastRainPartly Cloudy
June 654°F12°C72°F22°C8 mph12 km/h from SouthPartly CloudyPartly Cloudy

Yes

Low of 46°F8°C, High of 73°F23°C
Wind: 4 mph6 km/h
Precipitation: None

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