Yes

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

Why? Because it's cool. Pleasantly cool, but cool!
52°F11°C & Partly Cloudy

Wind is 4 mph6 km/h from the East, gusting to 11 mph18 km/h
April 28
4am50°F10°C3 mph5 km/h SouthwestClear
5am48°F9°C4 mph7 km/h WestPartly Cloudy
6am47°F9°C5 mph8 km/h WestPartly Cloudy
7am47°F8°C6 mph10 km/h NorthwestPartly Cloudy
8am46°F8°C5 mph8 km/h NorthwestPartly Cloudy
9am46°F8°C5 mph9 km/h NorthMostly Clear
10am49°F9°C5 mph9 km/h WestMostly Clear
11am53°F12°C8 mph13 km/h WestMostly Clear
12pm56°F13°C12 mph19 km/h NorthwestMostly Clear
1pm59°F15°C13 mph20 km/h NorthwestPartly Cloudy
2pm61°F16°C12 mph19 km/h NorthwestMostly Cloudy
3pm63°F17°C11 mph17 km/h NorthwestMostly Cloudy
DateLowHighWindDayNight
April 2844°F6°C64°F18°C10 mph16 km/h from NorthwestPartly CloudyPartly Cloudy
April 2938°F3°C65°F18°C6 mph10 km/h from SoutheastPartly CloudyMostly Clear
April 3041°F5°C69°F21°C5 mph8 km/h from NorthPartly CloudyMostly Cloudy
May 141°F5°C59°F15°C4 mph6 km/h from NortheastDrizzleMostly Clear
May 240°F4°C72°F22°C5 mph8 km/h from SoutheastMostly ClearPartly Cloudy
May 345°F7°C75°F24°C4 mph7 km/h from SouthMostly ClearMostly Clear
May 445°F7°C71°F22°C12 mph19 km/h from SouthPartly CloudyPartly Cloudy

Yes

Low of 37°F3°C, High of 65°F19°C
Wind: 6 mph10 km/h
Precipitation: 11% rain

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