No

you don't need a jacket based on the weather in San Diego, CA, USA 4 minutes ago

61°F16°C & Partly Cloudy

Wind is 7 mph12 km/h from the West, gusting to 11 mph18 km/h
April 27
2pm62°F16°C8 mph13 km/h WestMostly Clear
3pm63°F17°C10 mph16 km/h WestMostly Clear
4pm63°F17°C10 mph16 km/h WestMostly Clear
5pm64°F18°C10 mph15 km/h WestPartly Cloudy
6pm64°F18°C10 mph16 km/h WestMostly Clear
7pm64°F18°C10 mph16 km/h WestMostly Clear
8pm63°F17°C10 mph16 km/h WestMostly Clear
9pm62°F17°C9 mph15 km/h WestMostly Clear
10pm61°F16°C8 mph13 km/h WestPartly Cloudy
11pm59°F15°C7 mph11 km/h NorthwestPartly Cloudy
April 28
12am58°F15°C6 mph9 km/h NorthwestPartly Cloudy
1am58°F14°C5 mph8 km/h NorthwestPartly Cloudy
DateLowHighWindDayNight
April 2753°F12°C64°F18°C8 mph13 km/h from WestMostly ClearMostly Cloudy
April 2854°F12°C66°F19°C6 mph10 km/h from WestPartly CloudyMostly Clear
April 2953°F12°C71°F22°C6 mph10 km/h from WestMostly ClearMostly Clear
April 3055°F13°C71°F22°C6 mph10 km/h from WestMostly ClearPartly Cloudy
May 156°F13°C68°F20°C6 mph9 km/h from WestMostly ClearPartly Cloudy
May 257°F14°C68°F20°C7 mph11 km/h from WestPartly CloudyMostly Cloudy
May 353°F11°C65°F18°C9 mph14 km/h from WestMostly CloudyPartly Cloudy

Yes

Low of 55°F13°C, High of 66°F19°C
Wind: 6 mph10 km/h
Precipitation: None

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