Yes

you do need a jacket based on the weather in Jefferson, WI 53549, USA 1 second ago

Why? Because it's so windy, even the squirrels are holding onto branches for dear life!
87°F30°C & Windy

Wind is 16 mph25 km/h from the Southwest, gusting to 25 mph40 km/h
July 5
6pm86°F30°C16 mph26 km/h SouthwestWindy
7pm83°F28°C14 mph23 km/h SouthwestCloudy
8pm80°F27°C11 mph18 km/h SouthwestThunderstorms
9pm76°F24°C16 mph26 km/h SouthwestThunderstorms
10pm75°F24°C10 mph15 km/h SouthwestDrizzle
11pm74°F23°C10 mph17 km/h SouthwestRain
July 6
12am73°F23°C11 mph18 km/h SouthwestRain
1am72°F22°C11 mph17 km/h SouthwestThunderstorms
2am72°F22°C9 mph15 km/h SouthwestDrizzle
3am71°F22°C8 mph14 km/h SouthwestDrizzle
4am71°F22°C8 mph12 km/h SouthwestCloudy
5am71°F21°C7 mph11 km/h SouthwestCloudy
DateLowHighWindDayNight
July 571°F21°C88°F31°C13 mph22 km/h from SouthwestRainThunderstorms
July 663°F17°C79°F26°C8 mph13 km/h from NorthRainMostly Clear
July 758°F15°C80°F27°C5 mph8 km/h from NorthMostly ClearPartly Cloudy
July 862°F17°C82°F28°C7 mph12 km/h from SouthwestDrizzleRain
July 966°F19°C80°F27°C4 mph7 km/h from NorthDrizzlePartly Cloudy
July 1064°F18°C82°F28°C4 mph7 km/h from SoutheastMostly CloudyPartly Cloudy
July 1164°F18°C84°F29°C5 mph9 km/h from SoutheastMostly CloudyThunderstorms

No

Low of 64°F18°C, High of 79°F26°C
Wind: 8 mph13 km/h
Precipitation: 50% rain

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