Yes

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

Why? Because it's pretty chilly!
58°F14°C & Clear

Wind is 2 mph3 km/h from the Northeast, gusting to 4 mph7 km/h
October 16
4pm60°F15°C2 mph4 km/h NortheastClear
5pm63°F17°C3 mph5 km/h NorthwestClear
6pm67°F19°C4 mph6 km/h NorthwestClear
7pm69°F21°C6 mph9 km/h NorthwestClear
8pm70°F21°C8 mph13 km/h NorthwestClear
9pm71°F22°C9 mph14 km/h NorthwestClear
10pm72°F22°C9 mph15 km/h NorthwestClear
11pm71°F22°C9 mph14 km/h NorthwestClear
October 17
12am70°F21°C7 mph12 km/h NorthwestClear
1am68°F20°C5 mph9 km/h NorthwestClear
2am65°F19°C3 mph6 km/h NorthwestClear
3am64°F18°C3 mph4 km/h NorthClear
DateLowHighWindDayNight
October 1651°F11°C72°F22°C6 mph9 km/h from NorthwestClearClear
October 1754°F12°C75°F24°C5 mph8 km/h from NorthwestClearClear
October 1855°F13°C78°F25°C4 mph7 km/h from WestClearMostly Clear
October 1955°F13°C77°F25°C4 mph7 km/h from WestClearClear
October 2056°F13°C76°F24°C5 mph8 km/h from NorthwestClearMostly Clear
October 2159°F15°C71°F21°C5 mph8 km/h from SouthwestMostly ClearPartly Cloudy
October 2259°F15°C69°F21°C5 mph9 km/h from WestPartly CloudyPartly Cloudy

Yes

Low of 54°F12°C, High of 74°F24°C
Wind: 5 mph8 km/h
Precipitation: None

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