Yes

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

Why? Because the air feels like the cozy middle ground between summer and winter!
55°F13°C & Mostly Clear

Wind is 6 mph10 km/h from the East, gusting to 9 mph15 km/h
May 25
5pm55°F13°C6 mph10 km/h EastClear
6pm55°F13°C6 mph9 km/h EastClear
7pm54°F12°C4 mph7 km/h EastClear
8pm54°F12°C3 mph5 km/h EastClear
9pm52°F11°C1 mph2 km/h SoutheastClear
10pm50°F10°C2 mph2 km/h WestClear
11pm48°F9°C2 mph4 km/h NorthwestClear
May 26
12am47°F8°C4 mph6 km/h NorthwestClear
1am46°F8°C4 mph6 km/h NorthwestClear
2am45°F7°C5 mph7 km/h NorthwestClear
3am44°F7°C5 mph8 km/h NorthClear
4am44°F7°C6 mph9 km/h NorthClear
DateLowHighWindDayNight
May 2540°F5°C56°F14°C5 mph8 km/h from SoutheastClearClear
May 2644°F7°C58°F14°C8 mph12 km/h from NortheastMostly ClearMostly Cloudy
May 2747°F8°C59°F15°C11 mph18 km/h from NortheastCloudyRain
May 2849°F9°C55°F13°C12 mph20 km/h from NorthRainDrizzle
May 2949°F9°C64°F18°C11 mph18 km/h from NorthwestDrizzlePartly Cloudy
May 3054°F12°C73°F23°C13 mph22 km/h from WestMostly ClearMostly Clear
May 3154°F12°C67°F19°C7 mph12 km/h from NorthPartly CloudyPartly Cloudy

Yes

Low of 44°F7°C, High of 58°F15°C
Wind: 8 mph12 km/h
Precipitation: None

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