Yes

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

Why? Because there are strong winds blowing out there!
67°F20°C & Cloudy

Wind is 11 mph18 km/h from the Northeast, gusting to 27 mph44 km/h
July 6
9pm67°F19°C10 mph16 km/h NortheastMostly Clear
10pm65°F18°C10 mph15 km/h NortheastMostly Clear
11pm64°F18°C9 mph15 km/h NortheastPartly Cloudy
July 7
12am63°F17°C9 mph14 km/h NorthMostly Cloudy
1am62°F17°C7 mph12 km/h NorthMostly Clear
2am61°F16°C7 mph11 km/h NorthCloudy
3am62°F16°C7 mph12 km/h NorthMostly Cloudy
4am61°F16°C7 mph11 km/h NorthMostly Cloudy
5am61°F16°C7 mph11 km/h NorthPartly Cloudy
6am60°F16°C7 mph11 km/h NorthMostly Clear
7am60°F16°C7 mph11 km/h NorthPartly Cloudy
8am62°F17°C7 mph11 km/h NorthMostly Clear
DateLowHighWindDayNight
July 662°F17°C76°F24°C5 mph8 km/h from NorthThunderstormsPartly Cloudy
July 760°F16°C76°F24°C6 mph10 km/h from NortheastMostly ClearPartly Cloudy
July 862°F17°C80°F27°C6 mph10 km/h from SouthwestDrizzleDrizzle
July 966°F19°C79°F26°C5 mph9 km/h from NortheastMostly CloudyMostly Clear
July 1064°F18°C78°F26°C7 mph11 km/h from EastMostly ClearMostly Clear
July 1164°F18°C83°F28°C7 mph12 km/h from SoutheastPartly CloudyRain
July 1269°F20°C81°F27°C9 mph14 km/h from WestPartly CloudyMostly Clear

No

Low of 60°F16°C, High of 76°F25°C
Wind: 6 mph10 km/h
Precipitation: None

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