Yes

you do need a jacket based on the weather in Chesterfield, MO 63017, USA 1 second ago

Why? Because it's pretty chilly and it's windy enough to give you a brand new hairdo!
52°F11°C & Cloudy

Wind is 9 mph15 km/h from the East, gusting to 24 mph38 km/h
October 26
2pm52°F11°C10 mph16 km/h EastCloudy
3pm54°F12°C10 mph16 km/h EastCloudy
4pm56°F13°C10 mph16 km/h EastCloudy
5pm57°F14°C11 mph17 km/h EastCloudy
6pm58°F14°C11 mph18 km/h EastCloudy
7pm58°F15°C11 mph18 km/h EastDrizzle
8pm58°F15°C11 mph17 km/h EastDrizzle
9pm58°F14°C10 mph16 km/h EastDrizzle
10pm57°F14°C10 mph16 km/h EastDrizzle
11pm56°F13°C10 mph16 km/h EastDrizzle
October 27
12am55°F13°C9 mph15 km/h EastDrizzle
1am54°F12°C9 mph14 km/h EastDrizzle
DateLowHighWindDayNight
October 2651°F11°C58°F15°C10 mph16 km/h from EastDrizzleDrizzle
October 2749°F10°C59°F15°C7 mph12 km/h from EastMostly CloudyCloudy
October 2850°F10°C59°F15°C7 mph11 km/h from SoutheastRainRain
October 2946°F8°C55°F13°C11 mph17 km/h from NortheastRainDrizzle
October 3046°F8°C53°F12°C12 mph19 km/h from NorthDrizzlePartly Cloudy
October 3141°F5°C55°F13°C9 mph15 km/h from NorthwestPartly CloudyPartly Cloudy
November 139°F4°C56°F14°C6 mph9 km/h from WestPartly CloudyMostly Clear

Yes

Low of 49°F10°C, High of 59°F15°C
Wind: 7 mph12 km/h
Precipitation: None

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