Yes

you do need a jacket based on the weather in Brentwood, CA 94513, USA 1 second ago

Why? Because it's cool. Pleasantly cool, but cool.
55°F13°C & Mostly Clear

Wind is 6 mph9 km/h from the W, gusting to 11 mph17 km/h
March 28
2pm57°F14°C6 mph9 km/h WPartly Cloudy
3pm59°F15°C6 mph10 km/h WPartly Cloudy
4pm61°F16°C7 mph11 km/h WPartly Cloudy
5pm62°F16°C7 mph12 km/h WPartly Cloudy
6pm62°F17°C9 mph14 km/h WMostly Cloudy
7pm61°F16°C10 mph16 km/h WMostly Cloudy
8pm60°F16°C10 mph16 km/h WMostly Cloudy
9pm59°F15°C10 mph16 km/h WMostly Cloudy
10pm56°F13°C8 mph13 km/h WCloudy
11pm53°F12°C6 mph10 km/h WCloudy
March 29
12am52°F11°C5 mph7 km/h WCloudy
1am51°F10°C4 mph6 km/h SWMostly Cloudy
DateLowHighWindDayNight
March 2847°F9°C62°F17°C7 mph11 km/h from WPartly CloudyCloudy
March 2944°F7°C57°F14°C10 mph17 km/h from SERainMostly Cloudy
March 3047°F8°C59°F15°C7 mph11 km/h from ERainMostly Cloudy
March 3145°F7°C63°F17°C4 mph6 km/h from NWMostly CloudyClear
April 147°F8°C72°F22°C6 mph9 km/h from NWClearClear
April 247°F8°C75°F24°C3 mph4 km/h from NClearClear
April 349°F9°C75°F24°C4 mph6 km/h from WMostly ClearMostly Clear

Yes

Low of 45°F7°C, High of 57°F14°C
Wind: 10 mph17 km/h
Precipitation: 63% rain

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