Yes

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

Why? Because it's pretty chilly!
51°F11°C & Mostly Clear

Wind is 3 mph5 km/h from the North, gusting to 4 mph7 km/h
April 28
8am51°F10°C4 mph6 km/h NortheastMostly Clear
9am50°F10°C4 mph6 km/h NortheastMostly Clear
10am52°F11°C4 mph6 km/h NortheastMostly Clear
11am55°F13°C3 mph5 km/h NortheastMostly Clear
12pm58°F14°C2 mph4 km/h EastMostly Clear
1pm61°F16°C4 mph6 km/h SouthMostly Clear
2pm63°F17°C4 mph7 km/h SouthwestMostly Clear
3pm64°F18°C6 mph10 km/h SouthwestMostly Clear
4pm65°F19°C8 mph12 km/h SouthwestClear
5pm66°F19°C9 mph14 km/h SouthwestClear
6pm66°F19°C9 mph14 km/h SouthwestClear
7pm66°F19°C9 mph14 km/h SouthwestClear
DateLowHighWindDayNight
April 2850°F10°C66°F19°C6 mph10 km/h from SouthwestMostly ClearClear
April 2953°F12°C71°F21°C6 mph9 km/h from SouthwestMostly ClearMostly Clear
April 3055°F13°C68°F20°C6 mph9 km/h from SouthMostly CloudyMostly Cloudy
May 155°F13°C67°F20°C5 mph8 km/h from SouthwestPartly CloudyPartly Cloudy
May 255°F13°C68°F20°C5 mph9 km/h from SouthwestPartly CloudyMostly Cloudy
May 352°F11°C66°F19°C8 mph12 km/h from SouthwestPartly CloudyClear
May 447°F8°C64°F18°C12 mph19 km/h from WestMostly ClearClear

Yes

Low of 53°F12°C, High of 71°F22°C
Wind: 6 mph9 km/h
Precipitation: None

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