Yes

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

Why? Because it's pretty chilly.
56°F13°C & Cloudy

Wind is 9 mph15 km/h from the SE, gusting to 21 mph33 km/h
April 26
1am55°F13°C9 mph15 km/h SECloudy
2am55°F13°C10 mph16 km/h SECloudy
3am54°F12°C11 mph17 km/h SECloudy
4am54°F12°C12 mph19 km/h SECloudy
5am53°F12°C11 mph18 km/h SECloudy
6am53°F11°C12 mph20 km/h SEDrizzle
7am51°F11°C11 mph18 km/h SEDrizzle
8am51°F11°C12 mph20 km/h SEDrizzle
9am52°F11°C13 mph20 km/h SERain
10am53°F12°C14 mph22 km/h SERain
11am55°F13°C14 mph22 km/h SERain
12pm57°F14°C15 mph23 km/h SERain
DateLowHighWindDayNight
April 2543°F6°C65°F18°C5 mph8 km/h from EMostly CloudyRain
April 2651°F11°C74°F24°C14 mph23 km/h from SERainRain
April 2765°F18°C82°F28°C16 mph26 km/h from SWindyMostly Cloudy
April 2868°F20°C80°F27°C16 mph26 km/h from SWindyRain
April 2964°F18°C79°F26°C9 mph14 km/h from SWCloudyMostly Clear
April 3056°F13°C84°F29°C7 mph12 km/h from SMostly ClearDrizzle
May 163°F17°C81°F27°C7 mph11 km/h from SMostly CloudyMostly Clear

Yes

Low of 51°F11°C, High of 74°F24°C
Wind: 14 mph23 km/h
Precipitation: 78% rain

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