Yes

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

Why? Because it's cool. Pleasantly cool, but cool.
51°F11°C & Cloudy

Wind is 2 mph3 km/h from the SW, gusting to 5 mph8 km/h
April 26
8am51°F10°C3 mph4 km/h SWPartly Cloudy
9am50°F10°C3 mph5 km/h SWMostly Cloudy
10am52°F11°C2 mph4 km/h SWMostly Cloudy
11am53°F12°C3 mph5 km/h SWMostly Cloudy
12pm55°F13°C4 mph7 km/h SWMostly Cloudy
1pm57°F14°C5 mph8 km/h SWMostly Cloudy
2pm60°F16°C7 mph12 km/h WMostly Cloudy
3pm62°F17°C10 mph16 km/h WPartly Cloudy
4pm65°F18°C12 mph19 km/h SWPartly Cloudy
5pm66°F19°C14 mph22 km/h SWPartly Cloudy
6pm67°F19°C15 mph24 km/h SWPartly Cloudy
7pm67°F20°C15 mph24 km/h SWMostly Clear
DateLowHighWindDayNight
April 2650°F10°C68°F20°C10 mph16 km/h from SWPartly CloudyMostly Clear
April 2750°F10°C71°F22°C7 mph10 km/h from SWMostly ClearClear
April 2849°F9°C76°F24°C6 mph10 km/h from SWClearClear
April 2952°F11°C78°F26°C6 mph9 km/h from SWClearClear
April 3053°F12°C78°F26°C7 mph12 km/h from SWClearMostly Clear
May 153°F12°C76°F24°C6 mph10 km/h from SWMostly ClearMostly Clear
May 253°F12°C75°F24°C7 mph11 km/h from SWMostly ClearMostly Clear

Yes

Low of 50°F10°C, High of 72°F22°C
Wind: 7 mph10 km/h
Precipitation: None

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