Yes

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

Why? Because it's not very warm out!
56°F13°C & Partly Cloudy

Wind is 6 mph10 km/h from the Southwest, gusting to 12 mph20 km/h
December 27
1pm56°F14°C7 mph11 km/h SouthwestMostly Cloudy
2pm57°F14°C8 mph13 km/h SouthwestMostly Cloudy
3pm58°F15°C8 mph14 km/h SouthwestMostly Cloudy
4pm59°F15°C8 mph13 km/h SouthwestCloudy
5pm59°F15°C8 mph12 km/h SouthwestCloudy
6pm59°F15°C7 mph11 km/h SouthwestCloudy
7pm58°F14°C6 mph9 km/h SouthwestCloudy
8pm56°F13°C5 mph8 km/h SouthwestMostly Cloudy
9pm55°F13°C4 mph7 km/h SouthCloudy
10pm54°F12°C4 mph6 km/h SouthMostly Cloudy
11pm53°F12°C4 mph7 km/h SouthCloudy
December 28
12am52°F11°C5 mph8 km/h SouthCloudy
DateLowHighWindDayNight
December 2752°F11°C59°F15°C6 mph10 km/h from SouthwestDrizzleCloudy
December 2853°F12°C60°F16°C6 mph10 km/h from SouthwestCloudyRain
December 2948°F9°C59°F15°C11 mph18 km/h from SouthwestRainMostly Clear
December 3043°F6°C56°F13°C3 mph5 km/h from NorthwestMostly ClearMostly Clear
December 3140°F5°C56°F13°C3 mph6 km/h from NorthMostly ClearMostly Cloudy
January 143°F6°C57°F14°C5 mph7 km/h from NortheastPartly CloudyPartly Cloudy
January 244°F7°C59°F15°C5 mph8 km/h from NortheastMostly ClearPartly Cloudy

Yes

Low of 54°F12°C, High of 60°F16°C
Wind: 6 mph10 km/h
Precipitation: None

Support This Page