Yes

you do need a jacket based on the weather in Peoria Heights, IL 61616, USA 1 second ago

Why? Because it's not very warm out.
51°F11°C & Clear

Wind is 6 mph9 km/h from the NW, gusting to 14 mph23 km/h
April 24
1am50°F10°C6 mph10 km/h NWClear
2am49°F9°C6 mph10 km/h NWClear
3am47°F8°C6 mph9 km/h NWClear
4am46°F8°C6 mph10 km/h NClear
5am46°F8°C7 mph11 km/h NClear
6am44°F7°C8 mph12 km/h NClear
7am42°F6°C9 mph14 km/h NEMostly Clear
8am43°F6°C10 mph16 km/h NEMostly Clear
9am43°F6°C10 mph16 km/h NEMostly Clear
10am45°F7°C9 mph15 km/h NEPartly Cloudy
11am48°F9°C9 mph15 km/h NEMostly Clear
12pm51°F10°C9 mph14 km/h NEMostly Clear
DateLowHighWindDayNight
April 2349°F10°C61°F16°C5 mph8 km/h from SWRainClear
April 2442°F6°C60°F16°C8 mph12 km/h from NEMostly ClearMostly Clear
April 2536°F2°C64°F18°C8 mph13 km/h from SEPartly CloudyDrizzle
April 2648°F9°C66°F19°C16 mph27 km/h from SEThunderstormsThunderstorms
April 2762°F17°C79°F26°C18 mph29 km/h from SWindyRain
April 2862°F17°C75°F24°C18 mph29 km/h from SRainRain
April 2953°F12°C69°F21°C11 mph18 km/h from WRainPartly Cloudy

Yes

Low of 43°F6°C, High of 61°F16°C
Wind: 8 mph12 km/h
Precipitation: None

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