Yes

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

Why? Because it's cool. Pleasantly cool, but cool.
50°F10°C & Partly Cloudy

Wind is 2 mph3 km/h from the NE, gusting to 4 mph6 km/h
March 28
7am50°F10°C2 mph4 km/h EPartly Cloudy
8am50°F10°C2 mph4 km/h EPartly Cloudy
9am50°F10°C2 mph4 km/h SEPartly Cloudy
10am51°F10°C2 mph3 km/h EPartly Cloudy
11am53°F12°C2 mph3 km/h EPartly Cloudy
12pm56°F13°C2 mph3 km/h SPartly Cloudy
1pm59°F15°C2 mph4 km/h SWMostly Clear
2pm63°F17°C4 mph6 km/h SWMostly Clear
3pm66°F19°C6 mph9 km/h SWMostly Clear
4pm68°F20°C7 mph12 km/h SWMostly Clear
5pm70°F21°C9 mph14 km/h SWMostly Clear
6pm71°F21°C10 mph15 km/h SWMostly Clear
DateLowHighWindDayNight
March 2850°F10°C71°F21°C7 mph11 km/h from SWMostly ClearMostly Clear
March 2948°F9°C65°F18°C7 mph12 km/h from SPartly CloudyRain
March 3050°F10°C59°F15°C7 mph11 km/h from SRainRain
March 3149°F9°C60°F16°C7 mph11 km/h from SERainPartly Cloudy
April 147°F8°C71°F22°C6 mph9 km/h from SWClearClear
April 249°F9°C77°F25°C5 mph9 km/h from WClearClear
April 350°F10°C80°F27°C5 mph8 km/h from WClearClear

Yes

Low of 48°F9°C, High of 64°F18°C
Wind: 7 mph12 km/h
Precipitation: None

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