Yes

you do need a jacket based on the weather in Denver, CO 80239, USA 1 second ago

Why? Because it's cool enough your breath is visible, but your nose isn’t red yet!
43°F6°C & Clear

Wind is 6 mph10 km/h from the Southeast, gusting to 9 mph14 km/h
October 27
12pm42°F6°C7 mph11 km/h SouthClear
1pm42°F6°C7 mph10 km/h SouthClear
2pm43°F6°C6 mph9 km/h SouthMostly Cloudy
3pm48°F9°C5 mph7 km/h SoutheastMostly Clear
4pm54°F12°C4 mph6 km/h EastPartly Cloudy
5pm58°F15°C6 mph10 km/h NortheastMostly Cloudy
6pm61°F16°C8 mph12 km/h NortheastClear
7pm64°F18°C7 mph11 km/h NortheastMostly Clear
8pm67°F19°C7 mph12 km/h NorthMostly Clear
9pm68°F20°C10 mph16 km/h NorthwestPartly Cloudy
10pm67°F20°C11 mph18 km/h NorthwestPartly Cloudy
11pm65°F18°C13 mph20 km/h NorthwestMostly Clear
DateLowHighWindDayNight
October 2740°F4°C68°F20°C8 mph13 km/h from NorthMostly ClearMostly Clear
October 2830°F-1°C51°F10°C8 mph14 km/h from NorthClearClear
October 2925°F-4°C58°F15°C5 mph8 km/h from SoutheastClearMostly Clear
October 3033°F1°C56°F13°C5 mph7 km/h from EastMostly ClearPartly Cloudy
October 3132°F-0°C54°F12°C5 mph8 km/h from NorthPartly CloudyPartly Cloudy
November 134°F1°C67°F19°C3 mph5 km/h from SouthwestMostly ClearClear
November 245°F7°C72°F22°C5 mph8 km/h from SouthwestMostly ClearMostly Clear

Yes

Low of 29°F-2°C, High of 51°F11°C
Wind: 8 mph14 km/h
Precipitation: None

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