Yes

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

Why? Because it's cool. Pleasantly cool, but cool!
51°F11°C & Mostly Clear

Wind is 7 mph12 km/h from the Southeast, gusting to 15 mph24 km/h
April 27
11pm51°F11°C8 mph13 km/h SoutheastClear
April 28
12am50°F10°C7 mph11 km/h SoutheastClear
1am49°F10°C6 mph10 km/h SoutheastClear
2am49°F9°C6 mph9 km/h SouthMostly Clear
3am49°F9°C7 mph11 km/h SouthMostly Clear
4am48°F9°C7 mph11 km/h SouthClear
5am48°F9°C7 mph12 km/h SouthClear
6am47°F8°C7 mph12 km/h SouthPartly Cloudy
7am48°F9°C8 mph13 km/h SouthMostly Cloudy
8am50°F10°C9 mph15 km/h SouthMostly Cloudy
9am53°F12°C11 mph17 km/h SouthMostly Cloudy
10am57°F14°C13 mph21 km/h SouthMostly Cloudy
DateLowHighWindDayNight
April 2736°F2°C64°F18°C5 mph9 km/h from SoutheastMostly ClearMostly Clear
April 2847°F8°C79°F26°C16 mph26 km/h from SouthWindyHeavy Rain
April 2943°F6°C69°F21°C18 mph29 km/h from WestWindyMostly Clear
April 3038°F4°C59°F15°C9 mph15 km/h from SoutheastMostly CloudyRain
May 145°F7°C58°F14°C6 mph10 km/h from NortheastRainRain
May 241°F5°C56°F13°C11 mph18 km/h from NorthwestRainPartly Cloudy
May 337°F3°C58°F15°C7 mph11 km/h from WestMostly CloudyMostly Clear

Yes

Low of 47°F9°C, High of 80°F27°C
Wind: 16 mph26 km/h
Precipitation: 27% rain

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