Yes

you do need a jacket based on the weather in Salem Lakes (Trevor), Wisconsin, United States 1 second ago

Why? Because it's not very warm out!
52°F11°C & Clear

Wind is 4 mph6 km/h from the North, gusting to 7 mph11 km/h
August 29
7am52°F11°C4 mph7 km/h NortheastClear
8am53°F12°C3 mph6 km/h NorthClear
9am57°F14°C3 mph5 km/h NortheastMostly Clear
10am62°F16°C5 mph8 km/h NortheastMostly Clear
11am65°F18°C5 mph7 km/h NortheastPartly Cloudy
12pm68°F20°C4 mph6 km/h NortheastPartly Cloudy
1pm70°F21°C4 mph7 km/h NortheastPartly Cloudy
2pm70°F21°C5 mph8 km/h NortheastMostly Cloudy
3pm71°F21°C6 mph9 km/h NortheastMostly Cloudy
4pm71°F21°C5 mph9 km/h EastMostly Cloudy
5pm70°F21°C6 mph10 km/h EastMostly Cloudy
6pm68°F20°C8 mph12 km/h EastMostly Cloudy
DateLowHighWindDayNight
August 2951°F11°C71°F22°C5 mph9 km/h from EastPartly CloudyMostly Cloudy
August 3058°F14°C72°F22°C4 mph6 km/h from EastMostly CloudyMostly Clear
August 3153°F12°C75°F24°C6 mph9 km/h from EastClearClear
September 153°F11°C76°F25°C5 mph8 km/h from EastClearClear
September 255°F13°C78°F25°C5 mph8 km/h from EastMostly ClearMostly Clear
September 358°F14°C74°F23°C9 mph15 km/h from WestMostly CloudyDrizzle
September 451°F11°C61°F16°C12 mph19 km/h from NorthwestPartly CloudyPartly Cloudy

Yes

Low of 57°F14°C, High of 72°F22°C
Wind: 4 mph6 km/h
Precipitation: None

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