Yes

you do need a jacket based on the weather in St. Louis, MO 63128, USA 1 second ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
55°F13°C & Clear

Wind is 6 mph10 km/h from the West, gusting to 12 mph19 km/h
November 3
5pm57°F14°C7 mph11 km/h WestClear
6pm60°F15°C7 mph11 km/h NorthwestClear
7pm61°F16°C6 mph10 km/h NorthwestClear
8pm62°F17°C6 mph10 km/h NorthwestClear
9pm62°F17°C5 mph9 km/h NorthwestClear
10pm61°F16°C3 mph5 km/h NorthwestClear
11pm57°F14°C3 mph5 km/h WestClear
November 4
12am54°F12°C2 mph3 km/h WestClear
1am51°F11°C2 mph3 km/h SouthwestClear
2am49°F10°C2 mph3 km/h SouthMostly Clear
3am48°F9°C2 mph3 km/h SouthMostly Clear
4am46°F8°C2 mph3 km/h SouthMostly Clear
DateLowHighWindDayNight
November 337°F3°C62°F17°C5 mph7 km/h from WestClearPartly Cloudy
November 442°F6°C69°F21°C10 mph15 km/h from SouthMostly ClearPartly Cloudy
November 548°F9°C68°F20°C9 mph14 km/h from NorthwestClearClear
November 642°F6°C65°F18°C9 mph15 km/h from SoutheastMostly ClearMostly Cloudy
November 750°F10°C66°F19°C11 mph18 km/h from WestDrizzlePartly Cloudy
November 846°F8°C64°F18°C7 mph11 km/h from SouthMostly CloudyMostly Clear
November 935°F2°C51°F10°C15 mph24 km/h from NorthwestPartly CloudyMostly Clear

Yes

Low of 42°F6°C, High of 69°F21°C
Wind: 10 mph15 km/h
Precipitation: None

Support This Page