Yes

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

Why? Because it's bitterly cold.
48°F9°C & Partly Cloudy

Wind is 2 mph3 km/h from the W, gusting to 5 mph8 km/h
March 28
6am48°F9°C2 mph3 km/h WPartly Cloudy
7am47°F9°C2 mph3 km/h NEPartly Cloudy
8am47°F8°C2 mph3 km/h EPartly Cloudy
9am46°F8°C2 mph4 km/h EPartly Cloudy
10am47°F8°C2 mph3 km/h EPartly Cloudy
11am49°F9°C2 mph3 km/h EPartly Cloudy
12pm53°F11°C2 mph3 km/h SMostly Clear
1pm56°F13°C2 mph4 km/h SMostly Clear
2pm59°F15°C4 mph6 km/h SWMostly Clear
3pm62°F17°C5 mph8 km/h SWMostly Clear
4pm64°F18°C7 mph11 km/h SWMostly Clear
5pm66°F19°C8 mph13 km/h SWMostly Clear
DateLowHighWindDayNight
March 2846°F8°C67°F19°C6 mph10 km/h from SWMostly ClearPartly Cloudy
March 2946°F8°C60°F16°C7 mph11 km/h from SWPartly CloudyRain
March 3046°F8°C53°F12°C5 mph9 km/h from SRainDrizzle
March 3145°F7°C55°F13°C5 mph8 km/h from SERainDrizzle
April 145°F7°C66°F19°C5 mph9 km/h from SWMostly ClearClear
April 248°F9°C75°F24°C4 mph6 km/h from WClearClear
April 352°F11°C78°F26°C5 mph8 km/h from SWClearClear

Yes

Low of 46°F8°C, High of 61°F16°C
Wind: 7 mph11 km/h
Precipitation: None

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