Yes

you do need a jacket based on the weather in Union City, CA, USA 1 second ago

Why? Because sorry, it's too cool for just a hoodie!
57°F14°C & Cloudy

Wind is 4 mph6 km/h from the West, gusting to 6 mph10 km/h
July 17
8am56°F14°C3 mph5 km/h WestCloudy
9am56°F13°C4 mph6 km/h NorthwestCloudy
10am57°F14°C4 mph6 km/h NorthwestCloudy
11am58°F14°C4 mph6 km/h WestMostly Cloudy
12pm59°F15°C3 mph5 km/h WestMostly Cloudy
1pm62°F17°C4 mph6 km/h WestMostly Cloudy
2pm66°F19°C5 mph8 km/h WestMostly Clear
3pm70°F21°C6 mph10 km/h WestClear
4pm72°F22°C8 mph12 km/h WestClear
5pm73°F23°C9 mph14 km/h WestClear
6pm73°F23°C10 mph16 km/h WestClear
7pm73°F23°C10 mph17 km/h WestClear
DateLowHighWindDayNight
July 1756°F13°C73°F23°C7 mph11 km/h from WestMostly ClearPartly Cloudy
July 1857°F14°C73°F23°C7 mph11 km/h from WestMostly ClearPartly Cloudy
July 1955°F13°C73°F23°C6 mph10 km/h from WestMostly ClearMostly Clear
July 2054°F12°C75°F24°C7 mph11 km/h from WestMostly ClearPartly Cloudy
July 2157°F14°C73°F23°C8 mph13 km/h from WestPartly CloudyMostly Cloudy
July 2258°F14°C70°F21°C8 mph13 km/h from WestPartly CloudyMostly Cloudy
July 2357°F14°C72°F22°C7 mph11 km/h from WestPartly CloudyPartly Cloudy

Yes

Low of 56°F14°C, High of 73°F23°C
Wind: 7 mph11 km/h
Precipitation: None

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