Yes

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

Why? Because it's quite chilly.
38°F3°C & Mostly Clear

Wind is 3 mph5 km/h from the N, gusting to 7 mph11 km/h
March 29
2am37°F3°C3 mph5 km/h NMostly Clear
3am36°F2°C4 mph6 km/h NMostly Clear
4am34°F1°C4 mph7 km/h NMostly Clear
5am33°F1°C5 mph8 km/h NEPartly Cloudy
6am33°F1°C5 mph7 km/h NEMostly Cloudy
7am33°F0°C4 mph7 km/h NEMostly Cloudy
8am33°F0°C4 mph7 km/h NEMostly Cloudy
9am35°F2°C5 mph8 km/h NEMostly Cloudy
10am39°F4°C6 mph9 km/h EMostly Cloudy
11am43°F6°C6 mph10 km/h EMostly Cloudy
12pm46°F8°C6 mph10 km/h EMostly Cloudy
1pm50°F10°C6 mph10 km/h SEPartly Cloudy
DateLowHighWindDayNight
March 2933°F0°C61°F16°C7 mph11 km/h from EMostly CloudyRain
March 3044°F7°C62°F17°C11 mph18 km/h from NWMostly CloudyCloudy
March 3139°F4°C51°F10°C10 mph16 km/h from EDrizzleRain
April 142°F6°C51°F11°C11 mph18 km/h from NERainRain
April 238°F3°C46°F8°C12 mph19 km/h from NDrizzleMostly Cloudy
April 333°F1°C47°F8°C14 mph22 km/h from NWDrizzlePartly Cloudy
April 430°F-1°C55°F13°C9 mph14 km/h from NWMostly ClearClear

Yes

Low of 44°F7°C, High of 63°F17°C
Wind: 11 mph18 km/h
Precipitation: None

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