Yes

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

Why? Because it's so windy, even the squirrels are holding onto branches for dear life!
75°F24°C & Clear

Wind is 12 mph19 km/h from the East, gusting to 20 mph32 km/h
January 23
3pm76°F25°C14 mph22 km/h EastClear
4pm77°F25°C13 mph21 km/h EastClear
5pm76°F24°C13 mph20 km/h EastClear
6pm74°F23°C12 mph19 km/h EastClear
7pm72°F22°C10 mph17 km/h EastClear
8pm67°F19°C5 mph9 km/h EastClear
9pm61°F16°C5 mph8 km/h NorthwestClear
10pm58°F14°C5 mph8 km/h NortheastClear
11pm56°F13°C5 mph8 km/h NortheastClear
January 24
12am54°F12°C6 mph10 km/h NortheastClear
1am53°F12°C5 mph9 km/h NortheastClear
2am52°F11°C7 mph11 km/h EastClear
DateLowHighWindDayNight
January 2351°F11°C77°F25°C9 mph15 km/h from EastClearClear
January 2444°F7°C71°F22°C5 mph8 km/h from SouthwestPartly CloudyMostly Cloudy
January 2544°F7°C62°F17°C10 mph16 km/h from SouthMostly CloudyRain
January 2645°F7°C56°F13°C6 mph10 km/h from SouthwestDrizzleDrizzle
January 2742°F5°C56°F13°C5 mph7 km/h from WestPartly CloudyMostly Clear
January 2841°F5°C60°F15°C5 mph8 km/h from SouthwestMostly ClearMostly Clear
January 2942°F6°C61°F16°C4 mph7 km/h from WestClearMostly Clear

Yes

Low of 45°F7°C, High of 72°F22°C
Wind: 5 mph8 km/h
Precipitation: None

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