Yes

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

Why? Because it's pretty chilly.
53°F11°C & Partly Cloudy

Wind is 4 mph6 km/h from the SE, gusting to 9 mph14 km/h
March 29
12pm54°F12°C4 mph7 km/h SPartly Cloudy
1pm58°F14°C5 mph9 km/h SMostly Clear
2pm60°F16°C6 mph10 km/h SPartly Cloudy
3pm62°F17°C8 mph12 km/h SWMostly Cloudy
4pm64°F18°C8 mph13 km/h SWMostly Cloudy
5pm65°F18°C9 mph14 km/h SWMostly Cloudy
6pm64°F18°C10 mph15 km/h SWMostly Cloudy
7pm63°F17°C9 mph15 km/h SWMostly Cloudy
8pm62°F17°C9 mph15 km/h SWMostly Cloudy
9pm60°F15°C9 mph14 km/h SMostly Cloudy
10pm57°F14°C9 mph14 km/h SMostly Cloudy
11pm56°F13°C8 mph14 km/h SMostly Cloudy
DateLowHighWindDayNight
March 2949°F9°C65°F18°C7 mph12 km/h from SMostly CloudyRain
March 3051°F10°C60°F16°C6 mph9 km/h from SRainRain
March 3150°F10°C62°F16°C7 mph12 km/h from SEDrizzleDrizzle
April 148°F9°C69°F20°C5 mph9 km/h from SWMostly ClearClear
April 251°F10°C76°F24°C5 mph9 km/h from WClearClear
April 353°F12°C80°F27°C6 mph9 km/h from SWClearMostly Clear
April 452°F11°C66°F19°C8 mph13 km/h from SPartly CloudyPartly Cloudy

Yes

Low of 51°F11°C, High of 60°F16°C
Wind: 6 mph9 km/h
Precipitation: 87% rain

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