Yes

you do need a jacket based on the weather in El Cerrito, CA 94530, USA 1 second ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it!

57°F14°C & Cloudy

Wind is 9 mph15 km/h from the Southwest, gusting to 14 mph23 km/h

Date	Low	High	Wind	Day	Night
July 25	55°F13°C	65°F18°C	7 mph12 km/h from Southwest	Mostly Cloudy	Cloudy
July 26	56°F13°C	67°F19°C	10 mph17 km/h from Southwest	Mostly Cloudy	Mostly Cloudy
July 27	57°F14°C	68°F20°C	9 mph15 km/h from Southwest	Partly Cloudy	Partly Cloudy
July 28	56°F13°C	72°F22°C	8 mph13 km/h from Southwest	Mostly Clear	Partly Cloudy
July 29	55°F13°C	68°F20°C	10 mph16 km/h from Southwest	Mostly Clear	Mostly Cloudy
July 30	55°F13°C	66°F19°C	10 mph17 km/h from Southwest	Partly Cloudy	Mostly Cloudy
July 31	56°F13°C	67°F20°C	9 mph14 km/h from Southwest	Partly Cloudy	Mostly Cloudy

Low of 56°F14°C, High of 66°F19°C
Wind: 10 mph17 km/h
Precipitation: None