Yes

you do need a jacket based on the weather in Littleton, CO 80123, USA 1 second ago

Why? Because it's on the windy side!
76°F24°C & Clear

Wind is 11 mph17 km/h from the South, gusting to 22 mph35 km/h
August 21
1am76°F24°C10 mph17 km/h SouthClear
2am74°F23°C9 mph15 km/h SouthClear
3am73°F23°C9 mph15 km/h SouthClear
4am71°F22°C8 mph13 km/h SouthClear
5am69°F21°C7 mph11 km/h SouthClear
6am67°F20°C6 mph9 km/h SouthClear
7am65°F19°C5 mph9 km/h SouthwestClear
8am64°F18°C4 mph7 km/h SouthwestClear
9am65°F18°C4 mph7 km/h SouthwestClear
10am70°F21°C2 mph3 km/h SouthwestClear
11am76°F24°C2 mph3 km/h EastClear
12pm81°F27°C3 mph4 km/h EastClear
DateLowHighWindDayNight
August 2060°F16°C96°F35°C4 mph6 km/h from EastClearClear
August 2164°F18°C94°F34°C6 mph10 km/h from NortheastClearMostly Clear
August 2264°F18°C82°F28°C6 mph10 km/h from NorthPartly CloudyMostly Cloudy
August 2361°F16°C76°F25°C5 mph7 km/h from NortheastMostly CloudyPartly Cloudy
August 2458°F15°C76°F24°C5 mph9 km/h from NorthMostly CloudyCloudy
August 2560°F15°C71°F22°C5 mph8 km/h from NortheastRainDrizzle
August 2658°F14°C70°F21°C3 mph5 km/h from NortheastDrizzleCloudy

No

Low of 64°F18°C, High of 94°F35°C
Wind: 6 mph10 km/h
Precipitation: None

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