Yes

you do need a jacket based on the weather in St. Louis, MO 63147, USA 1 second ago

Why? Because you're not freezing, but you’ll definitely start complaining if it lasts much longer!
45°F7°C & Clear

Wind is 7 mph12 km/h from the West, gusting to 17 mph28 km/h
October 22
10am45°F7°C8 mph13 km/h WestClear
11am44°F7°C8 mph13 km/h WestClear
12pm44°F6°C8 mph13 km/h WestClear
1pm44°F7°C9 mph14 km/h WestClear
2pm47°F9°C11 mph17 km/h WestClear
3pm51°F10°C12 mph19 km/h NorthwestClear
4pm54°F12°C13 mph21 km/h NorthwestClear
5pm57°F14°C13 mph20 km/h WestClear
6pm60°F16°C13 mph21 km/h WestClear
7pm62°F17°C13 mph21 km/h WestClear
8pm63°F17°C13 mph20 km/h WestClear
9pm63°F17°C12 mph19 km/h WestClear
DateLowHighWindDayNight
October 2244°F6°C63°F17°C11 mph18 km/h from WestClearClear
October 2342°F5°C61°F16°C6 mph9 km/h from NorthwestClearMostly Clear
October 2440°F4°C60°F15°C5 mph8 km/h from SoutheastMostly CloudyCloudy
October 2548°F9°C60°F16°C7 mph12 km/h from EastCloudyCloudy
October 2650°F10°C61°F16°C9 mph15 km/h from EastCloudyCloudy
October 2751°F11°C63°F17°C10 mph16 km/h from SoutheastMostly CloudyMostly Cloudy
October 2850°F10°C61°F16°C10 mph16 km/h from EastCloudyThunderstorms

Yes

Low of 42°F6°C, High of 61°F16°C
Wind: 6 mph9 km/h
Precipitation: None

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