Yes

you do need a jacket based on the weather in Gurnee, IL, USA 1 second ago

Why? Because the rain is just enough to ruin your hairstyle but not your mood!
75°F24°C & Rain

Wind is 7 mph12 km/h from the South, gusting to 19 mph30 km/h
July 11
11pm75°F24°C8 mph13 km/h SouthThunderstorms
July 12
12am74°F23°C9 mph15 km/h SouthwestThunderstorms
1am73°F23°C5 mph9 km/h SouthwestCloudy
2am72°F22°C7 mph12 km/h SouthwestThunderstorms
3am71°F22°C6 mph10 km/h SouthThunderstorms
4am70°F21°C7 mph11 km/h SouthwestCloudy
5am70°F21°C6 mph10 km/h SouthwestCloudy
6am70°F21°C8 mph13 km/h WestCloudy
7am71°F21°C8 mph13 km/h SouthwestMostly Cloudy
8am71°F22°C8 mph14 km/h SouthwestMostly Cloudy
9am72°F22°C9 mph15 km/h SouthwestMostly Cloudy
10am73°F23°C10 mph16 km/h SouthwestMostly Cloudy
DateLowHighWindDayNight
July 1168°F20°C84°F29°C3 mph6 km/h from EastThunderstormsThunderstorms
July 1269°F20°C83°F29°C10 mph15 km/h from WestDrizzleMostly Clear
July 1364°F18°C81°F27°C6 mph10 km/h from WestPartly CloudyMostly Clear
July 1466°F19°C86°F30°C7 mph12 km/h from SouthwestMostly ClearPartly Cloudy
July 1571°F22°C84°F29°C7 mph11 km/h from SouthPartly CloudyRain
July 1668°F20°C79°F26°C7 mph12 km/h from NortheastRainRain
July 1765°F18°C77°F25°C9 mph14 km/h from WestDrizzleDrizzle

No

Low of 69°F21°C, High of 83°F29°C
Wind: 10 mph15 km/h
Precipitation: 38% rain

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