Yes

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

Why? Because the drizzle is not enough rain to call it "raining," but enough to make you a little soggy!
75°F24°C & Drizzle

Wind is 5 mph8 km/h from the East, gusting to 12 mph19 km/h
August 27
6pm74°F23°C4 mph6 km/h EastThunderstorms
7pm71°F22°C7 mph12 km/h NortheastThunderstorms
8pm69°F21°C5 mph8 km/h EastDrizzle
9pm68°F20°C2 mph3 km/h NortheastDrizzle
10pm66°F19°C4 mph7 km/h SoutheastMostly Clear
11pm65°F18°C5 mph9 km/h SouthMostly Clear
August 28
12am64°F18°C3 mph6 km/h SouthMostly Clear
1am64°F18°C4 mph6 km/h EastPartly Cloudy
2am63°F17°C4 mph6 km/h EastPartly Cloudy
3am62°F17°C3 mph5 km/h WestPartly Cloudy
4am61°F16°C3 mph5 km/h WestMostly Clear
5am60°F16°C2 mph3 km/h SouthwestMostly Clear
DateLowHighWindDayNight
August 2761°F16°C80°F27°C4 mph7 km/h from NortheastThunderstormsDrizzle
August 2858°F14°C78°F26°C4 mph6 km/h from EastPartly CloudyPartly Cloudy
August 2959°F15°C78°F25°C3 mph5 km/h from NorthwestPartly CloudyPartly Cloudy
August 3060°F15°C76°F24°C4 mph7 km/h from NortheastPartly CloudyMostly Clear
August 3155°F13°C80°F27°C3 mph5 km/h from EastClearClear
September 156°F13°C81°F27°C3 mph6 km/h from NortheastClearMostly Clear
September 257°F14°C85°F29°C3 mph5 km/h from NortheastMostly ClearMostly Clear

Yes

Low of 58°F15°C, High of 79°F26°C
Wind: 4 mph6 km/h
Precipitation: 27% rain

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