Yes

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

Why? Because it's not very warm out.
57°F14°C & Mostly Clear

Wind is 3 mph5 km/h from the SW, gusting to 7 mph12 km/h
April 20
1am57°F14°C3 mph4 km/h SWMostly Clear
2am56°F13°C2 mph4 km/h SMostly Clear
3am55°F13°C2 mph4 km/h SEMostly Clear
4am55°F13°C2 mph4 km/h SEPartly Cloudy
5am54°F12°C2 mph3 km/h SEPartly Cloudy
6am54°F12°C2 mph3 km/h SEPartly Cloudy
7am54°F12°C2 mph3 km/h SEMostly Cloudy
8am55°F13°C2 mph3 km/h SEMostly Cloudy
9am55°F13°C2 mph3 km/h SEMostly Cloudy
10am55°F13°C2 mph3 km/h EMostly Cloudy
11am56°F14°C2 mph4 km/h SEMostly Cloudy
12pm58°F14°C3 mph4 km/h SEMostly Cloudy
DateLowHighWindDayNight
April 1955°F13°C69°F20°C3 mph5 km/h from SWPartly CloudyPartly Cloudy
April 2054°F12°C72°F22°C5 mph8 km/h from SWMostly ClearClear
April 2157°F14°C77°F25°C5 mph8 km/h from SWClearMostly Clear
April 2256°F13°C75°F24°C6 mph9 km/h from SMostly ClearMostly Cloudy
April 2355°F13°C70°F21°C6 mph10 km/h from SWPartly CloudyMostly Clear
April 2453°F12°C68°F20°C7 mph11 km/h from SWMostly ClearPartly Cloudy
April 2552°F11°C66°F19°C6 mph10 km/h from SPartly CloudyPartly Cloudy

Yes

Low of 55°F13°C, High of 73°F23°C
Wind: 5 mph8 km/h
Precipitation: None

Support This Page