Yes

you do need a jacket based on the weather in Montgomery, IL, USA 1 second ago

Why? Because it's not very warm out!
53°F12°C & Mostly Clear

Wind is 10 mph16 km/h from the South, gusting to 16 mph25 km/h
November 6
6pm55°F13°C11 mph17 km/h SouthPartly Cloudy
7pm57°F14°C12 mph19 km/h SouthMostly Cloudy
8pm58°F14°C12 mph19 km/h SouthCloudy
9pm58°F14°C11 mph18 km/h SouthCloudy
10pm56°F13°C9 mph15 km/h SouthCloudy
11pm53°F11°C8 mph13 km/h SouthCloudy
November 7
12am51°F11°C10 mph16 km/h SouthCloudy
1am52°F11°C12 mph19 km/h SouthCloudy
2am51°F11°C14 mph22 km/h SouthCloudy
3am51°F10°C15 mph24 km/h SouthCloudy
4am51°F10°C15 mph25 km/h SouthWindy
5am51°F10°C16 mph26 km/h SouthWindy
DateLowHighWindDayNight
November 630°F-1°C58°F14°C8 mph13 km/h from SouthMostly CloudyRain
November 743°F6°C59°F15°C13 mph21 km/h from WestMostly ClearPartly Cloudy
November 837°F3°C50°F10°C4 mph6 km/h from NorthRainRain
November 925°F-4°C37°F3°C16 mph25 km/h from NorthwestWindyPartly Cloudy
November 1023°F-5°C36°F2°C12 mph20 km/h from NorthwestMostly ClearPartly Cloudy
November 1125°F-4°C43°F6°C15 mph24 km/h from SouthwestMostly CloudyPartly Cloudy
November 1236°F2°C51°F11°C16 mph25 km/h from WestWindyMostly Clear

Yes

Low of 43°F6°C, High of 59°F15°C
Wind: 13 mph21 km/h
Precipitation: None

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