Yes

you do need a jacket based on the weather in San Diego, CA 92103, USA 1 second ago

Why? Because it's pretty chilly.
55°F13°C & Mostly Clear

Wind is 2 mph4 km/h from the W, gusting to 6 mph10 km/h
March 29
6am55°F13°C3 mph5 km/h WMostly Clear
7am53°F12°C3 mph5 km/h WMostly Clear
8am52°F11°C3 mph5 km/h WMostly Clear
9am52°F11°C3 mph4 km/h SWMostly Clear
10am52°F11°C2 mph4 km/h SWMostly Clear
11am54°F12°C3 mph5 km/h SMostly Clear
12pm57°F14°C4 mph6 km/h SWMostly Clear
1pm59°F15°C5 mph8 km/h WMostly Clear
2pm61°F16°C6 mph10 km/h WMostly Clear
3pm62°F17°C7 mph12 km/h WMostly Clear
4pm62°F17°C8 mph14 km/h SWMostly Clear
5pm63°F17°C9 mph15 km/h SWPartly Cloudy
DateLowHighWindDayNight
March 2952°F11°C63°F17°C7 mph11 km/h from SWMostly ClearRain
March 3052°F11°C57°F14°C10 mph16 km/h from SRainRain
March 3151°F10°C60°F16°C13 mph20 km/h from SRainDrizzle
April 150°F10°C63°F17°C6 mph10 km/h from WMostly ClearClear
April 249°F10°C68°F20°C6 mph9 km/h from NWClearClear
April 351°F11°C71°F22°C6 mph9 km/h from WClearMostly Cloudy
April 454°F12°C61°F16°C9 mph15 km/h from SWMostly CloudyMostly Cloudy

Yes

Low of 52°F11°C, High of 57°F14°C
Wind: 10 mph16 km/h
Precipitation: 85% rain

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