Yes

you do need a jacket based on the weather in Pomona (Westmont), California, United States 1 second ago

Why? Because there's a refreshing nip in the air.
49°F9°C & Mostly Clear

Wind is 2 mph3 km/h from the SE, gusting to 6 mph10 km/h
March 29
7am49°F9°C2 mph4 km/h SEMostly Clear
8am48°F9°C3 mph4 km/h EPartly Cloudy
9am47°F8°C3 mph5 km/h EPartly Cloudy
10am46°F8°C3 mph5 km/h EMostly Clear
11am49°F9°C3 mph5 km/h SEMostly Clear
12pm51°F10°C4 mph7 km/h SEPartly Cloudy
1pm53°F12°C4 mph7 km/h SPartly Cloudy
2pm55°F13°C5 mph8 km/h SPartly Cloudy
3pm58°F14°C6 mph10 km/h SPartly Cloudy
4pm59°F15°C8 mph12 km/h SWMostly Cloudy
5pm60°F15°C9 mph15 km/h SWMostly Cloudy
6pm60°F16°C10 mph16 km/h SWMostly Cloudy
DateLowHighWindDayNight
March 2946°F8°C60°F16°C7 mph11 km/h from SWPartly CloudyHeavy Rain
March 3046°F8°C54°F12°C5 mph8 km/h from SRainRain
March 3146°F8°C55°F13°C5 mph8 km/h from SERainDrizzle
April 145°F7°C65°F18°C5 mph8 km/h from SWMostly ClearClear
April 248°F9°C74°F23°C4 mph7 km/h from SWClearClear
April 352°F11°C76°F24°C5 mph8 km/h from SWClearMostly Clear
April 450°F10°C61°F16°C8 mph12 km/h from SWPartly CloudyMostly Cloudy

Yes

Low of 46°F8°C, High of 54°F12°C
Wind: 5 mph8 km/h
Precipitation: 85% rain

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