Yes

you do need a jacket based on the weather in Fullerton, 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 E, gusting to 4 mph6 km/h
March 28
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°C3 mph4 km/h SWPartly Cloudy
2pm63°F17°C4 mph6 km/h SWMostly Clear
3pm65°F18°C6 mph9 km/h SWMostly Clear
4pm67°F20°C7 mph12 km/h SWMostly Clear
5pm69°F21°C9 mph14 km/h SWMostly Clear
6pm70°F21°C10 mph16 km/h SWMostly Clear
7pm69°F21°C10 mph16 km/h SWMostly Clear
8pm68°F20°C11 mph17 km/h WMostly Clear
9pm66°F19°C10 mph16 km/h WMostly Cloudy
DateLowHighWindDayNight
March 2850°F10°C70°F21°C6 mph10 km/h from SWMostly ClearMostly Clear
March 2950°F10°C64°F18°C7 mph12 km/h from SWPartly CloudyRain
March 3050°F10°C58°F15°C7 mph11 km/h from SRainRain
March 3149°F10°C59°F15°C6 mph10 km/h from SERainPartly Cloudy
April 149°F9°C69°F21°C5 mph8 km/h from SWClearClear
April 251°F11°C78°F26°C5 mph8 km/h from WClearClear
April 356°F13°C80°F27°C5 mph8 km/h from WClearClear

Yes

Low of 49°F10°C, High of 64°F18°C
Wind: 7 mph12 km/h
Precipitation: None

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