Yes

you do need a jacket based on the weather in St Charles, IL 60174, USA 1 second ago

Why? Because there's a refreshing nip in the air.
40°F4°C & Partly Cloudy

Wind is 9 mph15 km/h from the W, gusting to 19 mph30 km/h
March 28
1pm42°F6°C10 mph17 km/h WPartly Cloudy
2pm45°F7°C11 mph18 km/h WPartly Cloudy
3pm48°F9°C12 mph19 km/h WMostly Clear
4pm49°F10°C12 mph19 km/h WMostly Clear
5pm50°F10°C11 mph18 km/h WMostly Clear
6pm51°F10°C11 mph17 km/h WMostly Clear
7pm49°F10°C9 mph14 km/h WMostly Clear
8pm46°F8°C6 mph9 km/h NWMostly Clear
9pm43°F6°C5 mph8 km/h NWMostly Clear
10pm40°F5°C5 mph7 km/h NWMostly Clear
11pm38°F4°C5 mph8 km/h NMostly Clear
March 29
12am36°F2°C5 mph8 km/h NClear
DateLowHighWindDayNight
March 2827°F-3°C51°F10°C9 mph14 km/h from WPartly CloudyMostly Clear
March 2930°F-1°C58°F14°C8 mph12 km/h from EMostly CloudyRain
March 3043°F6°C58°F15°C10 mph16 km/h from NWMostly CloudyMostly Cloudy
March 3136°F2°C48°F9°C10 mph16 km/h from ECloudyDrizzle
April 140°F5°C48°F9°C12 mph19 km/h from NERainRain
April 237°F3°C48°F9°C13 mph21 km/h from NRainPartly Cloudy
April 334°F1°C51°F10°C15 mph24 km/h from NWWindyMostly Clear

Yes

Low of 30°F-1°C, High of 57°F14°C
Wind: 8 mph12 km/h
Precipitation: None

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