Yes

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

Why? Because it's not very warm out!
59°F15°C & Cloudy

Wind is 10 mph16 km/h from the Northwest, gusting to 17 mph28 km/h
November 25
11am58°F15°C11 mph17 km/h NorthwestMostly Cloudy
12pm58°F15°C12 mph19 km/h NorthwestCloudy
1pm58°F14°C13 mph21 km/h NorthwestCloudy
2pm56°F13°C15 mph24 km/h NorthwestCloudy
3pm54°F12°C15 mph24 km/h NorthwestWindy
4pm52°F11°C15 mph24 km/h NorthwestWindy
5pm50°F10°C14 mph23 km/h NorthwestCloudy
6pm48°F9°C14 mph23 km/h NorthwestMostly Cloudy
7pm46°F8°C14 mph22 km/h NorthwestMostly Clear
8pm44°F6°C13 mph21 km/h NorthwestMostly Clear
9pm42°F6°C13 mph21 km/h NorthwestMostly Clear
10pm40°F5°C12 mph20 km/h NorthwestClear
DateLowHighWindDayNight
November 2535°F2°C60°F16°C12 mph20 km/h from NorthwestMostly CloudyClear
November 2630°F-1°C48°F9°C4 mph6 km/h from SouthwestPartly CloudyCloudy
November 2740°F4°C48°F9°C5 mph9 km/h from EastDrizzleDrizzle
November 2831°F-1°C43°F6°C10 mph17 km/h from NorthwestPartly CloudyMostly Clear
November 2926°F-3°C40°F4°C9 mph15 km/h from NorthwestClearMostly Cloudy
November 3024°F-4°C40°F4°C6 mph9 km/h from WestMostly CloudyMostly Clear
December 119°F-7°C31°F-0°C11 mph17 km/h from NorthwestMostly ClearMostly Clear

Yes

Low of 29°F-2°C, High of 47°F9°C
Wind: 4 mph6 km/h
Precipitation: None

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