Yes

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

Why? Because it's not very warm out.
51°F11°C & Mostly Clear

Wind is 3 mph5 km/h from the SE, gusting to 4 mph7 km/h
March 29
11am52°F11°C3 mph6 km/h SEMostly Clear
12pm56°F13°C4 mph6 km/h SWMostly Clear
1pm59°F15°C5 mph7 km/h WPartly Cloudy
2pm61°F16°C6 mph10 km/h WPartly Cloudy
3pm62°F17°C7 mph12 km/h WPartly Cloudy
4pm63°F17°C9 mph14 km/h SWMostly Clear
5pm64°F18°C9 mph15 km/h SWMostly Clear
6pm63°F17°C10 mph16 km/h SWMostly Clear
7pm63°F17°C9 mph15 km/h SWMostly Clear
8pm61°F16°C9 mph15 km/h SWMostly Clear
9pm60°F16°C9 mph14 km/h SWMostly Clear
10pm58°F15°C7 mph12 km/h SWMostly Clear
DateLowHighWindDayNight
March 2949°F10°C64°F18°C7 mph11 km/h from SWMostly ClearRain
March 3052°F11°C57°F14°C10 mph16 km/h from SRainDrizzle
March 3151°F10°C60°F16°C12 mph19 km/h from SRainDrizzle
April 149°F10°C64°F18°C6 mph10 km/h from WMostly ClearClear
April 249°F9°C68°F20°C5 mph9 km/h from NWClearClear
April 352°F11°C73°F23°C5 mph9 km/h from NWClearPartly Cloudy
April 454°F12°C64°F18°C7 mph12 km/h from SWPartly CloudyMostly Cloudy

Yes

Low of 52°F11°C, High of 57°F14°C
Wind: 10 mph16 km/h
Precipitation: 86% rain

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