Yes

you do need a jacket based on the weather in Chula Vista, CA 91910, USA 1 second ago

Why? Because sorry, it's too cool for just a hoodie!
55°F13°C & Cloudy

Wind is 4 mph7 km/h from the Southeast, gusting to 9 mph14 km/h
May 5
10am56°F13°C5 mph7 km/h SoutheastCloudy
11am57°F14°C4 mph7 km/h SouthCloudy
12pm58°F15°C5 mph8 km/h SouthCloudy
1pm60°F16°C5 mph8 km/h SouthwestMostly Cloudy
2pm61°F16°C6 mph10 km/h SouthwestMostly Cloudy
3pm63°F17°C7 mph11 km/h SouthwestMostly Cloudy
4pm65°F18°C8 mph13 km/h SouthwestMostly Cloudy
5pm65°F19°C9 mph14 km/h SouthwestPartly Cloudy
6pm65°F18°C9 mph15 km/h SouthwestPartly Cloudy
7pm65°F18°C9 mph14 km/h SouthwestPartly Cloudy
8pm64°F18°C7 mph12 km/h SouthwestPartly Cloudy
9pm63°F17°C6 mph10 km/h SouthwestPartly Cloudy
DateLowHighWindDayNight
May 554°F12°C65°F19°C7 mph11 km/h from SouthwestMostly CloudyMostly Clear
May 653°F12°C69°F20°C7 mph11 km/h from SouthwestPartly CloudyMostly Clear
May 753°F12°C72°F22°C7 mph11 km/h from WestMostly ClearMostly Clear
May 856°F14°C77°F25°C6 mph10 km/h from WestMostly ClearMostly Clear
May 958°F14°C80°F27°C5 mph9 km/h from WestClearClear
May 1060°F16°C80°F26°C5 mph9 km/h from WestMostly ClearPartly Cloudy
May 1160°F15°C73°F23°C7 mph11 km/h from SouthwestPartly CloudyPartly Cloudy

Yes

Low of 54°F12°C, High of 69°F21°C
Wind: 7 mph11 km/h
Precipitation: None

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