Yes

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

Why? Because it's cool. Pleasantly cool, but cool!
55°F13°C & Partly Cloudy

Wind is 6 mph9 km/h from the Southwest, gusting to 15 mph24 km/h
October 14
4pm59°F15°C6 mph10 km/h SouthwestClear
5pm63°F17°C6 mph10 km/h WestClear
6pm68°F20°C7 mph12 km/h SouthwestClear
7pm72°F22°C14 mph22 km/h SouthwestClear
8pm75°F24°C15 mph25 km/h SouthwestWindy
9pm76°F24°C14 mph22 km/h SouthwestClear
10pm76°F24°C15 mph25 km/h SouthwestWindy
11pm74°F23°C11 mph17 km/h SouthClear
October 15
12am70°F21°C7 mph11 km/h SouthClear
1am65°F18°C5 mph9 km/h SouthClear
2am62°F17°C6 mph10 km/h SouthClear
3am59°F15°C5 mph9 km/h SouthClear
DateLowHighWindDayNight
October 1445°F7°C76°F25°C10 mph16 km/h from SouthwestClearClear
October 1550°F10°C77°F25°C11 mph17 km/h from SouthMostly ClearMostly Clear
October 1646°F8°C66°F19°C6 mph10 km/h from NorthwestMostly ClearMostly Clear
October 1738°F3°C62°F17°C6 mph9 km/h from NorthClearMostly Clear
October 1838°F3°C64°F18°C6 mph10 km/h from NorthMostly ClearClear
October 1938°F3°C73°F23°C4 mph7 km/h from SoutheastClearMostly Clear
October 2046°F8°C70°F21°C6 mph9 km/h from SouthwestClearMostly Clear

Yes

Low of 50°F10°C, High of 77°F25°C
Wind: 11 mph17 km/h
Precipitation: 10% rain

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