Yes

you do need a jacket based on the weather in Denver (Highland), Colorado, United States 1 second ago

Why? Because the air feels like the cozy middle ground between summer and winter!
54°F12°C & Mostly Cloudy

Wind is 2 mph3 km/h from the South, gusting to 4 mph6 km/h
June 6
3am54°F12°C2 mph3 km/h SouthMostly Cloudy
4am53°F12°C3 mph4 km/h NorthwestMostly Cloudy
5am52°F11°C1 mph1 km/h SouthwestMostly Cloudy
6am52°F11°C1 mph2 km/h EastMostly Cloudy
7am52°F11°C1 mph2 km/h WestMostly Cloudy
8am51°F11°C2 mph3 km/h SoutheastCloudy
9am53°F12°C2 mph3 km/h SoutheastCloudy
10am53°F12°C3 mph4 km/h EastCloudy
11am55°F13°C3 mph5 km/h EastCloudy
12pm58°F14°C2 mph4 km/h EastCloudy
1pm60°F16°C2 mph4 km/h NortheastCloudy
2pm63°F17°C4 mph6 km/h NortheastCloudy
DateLowHighWindDayNight
June 651°F11°C66°F19°C4 mph7 km/h from NortheastThunderstormsMostly Clear
June 749°F9°C80°F27°C5 mph8 km/h from WestClearClear
June 853°F12°C73°F23°C5 mph8 km/h from NortheastPartly CloudyPartly Cloudy
June 953°F11°C76°F25°C3 mph6 km/h from EastMostly ClearClear
June 1054°F12°C84°F29°C4 mph6 km/h from EastClearPartly Cloudy
June 1157°F14°C83°F28°C5 mph7 km/h from SouthPartly CloudyMostly Clear
June 1257°F14°C82°F28°C4 mph7 km/h from EastPartly CloudyMostly Clear

Yes

Low of 48°F9°C, High of 80°F27°C
Wind: 5 mph8 km/h
Precipitation: None

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