Yes

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

Why? Because it's pretty chilly!
53°F12°C & Mostly Clear

Wind is 5 mph8 km/h from the South, gusting to 14 mph23 km/h
April 28
3am53°F12°C5 mph9 km/h SouthClear
4am52°F11°C5 mph9 km/h SouthClear
5am51°F11°C6 mph10 km/h SoutheastMostly Clear
6am51°F11°C7 mph11 km/h SouthMostly Clear
7am51°F11°C7 mph11 km/h SouthMostly Clear
8am53°F12°C8 mph14 km/h SouthMostly Clear
9am57°F14°C10 mph16 km/h SouthPartly Cloudy
10am60°F16°C11 mph17 km/h SouthPartly Cloudy
11am64°F18°C12 mph19 km/h SouthMostly Cloudy
12pm68°F20°C13 mph21 km/h SouthPartly Cloudy
1pm71°F22°C14 mph22 km/h SouthMostly Cloudy
2pm75°F24°C15 mph24 km/h SouthPartly Cloudy
DateLowHighWindDayNight
April 2851°F11°C81°F27°C14 mph23 km/h from SouthPartly CloudyThunderstorms
April 2947°F8°C73°F23°C14 mph23 km/h from WestMostly CloudyPartly Cloudy
April 3042°F6°C59°F15°C8 mph13 km/h from EastDrizzleRain
May 149°F9°C61°F16°C6 mph10 km/h from WestRainRain
May 243°F6°C59°F15°C10 mph16 km/h from NorthwestRainMostly Clear
May 340°F4°C63°F17°C5 mph9 km/h from SouthwestPartly CloudyClear
May 450°F10°C75°F24°C9 mph14 km/h from SouthwestMostly ClearPartly Cloudy

Yes

Low of 46°F8°C, High of 73°F23°C
Wind: 14 mph23 km/h
Precipitation: None

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