Yes

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

Why? Because it's bitterly cold.
49°F10°C & Mostly Clear

Wind is 3 mph5 km/h from the W, gusting to 8 mph13 km/h
March 28
11am50°F10°C3 mph5 km/h WMostly Clear
12pm53°F12°C4 mph6 km/h WMostly Clear
1pm55°F13°C4 mph7 km/h WPartly Cloudy
2pm57°F14°C5 mph9 km/h WPartly Cloudy
3pm59°F15°C5 mph8 km/h WPartly Cloudy
4pm61°F16°C5 mph9 km/h WPartly Cloudy
5pm62°F17°C6 mph10 km/h WMostly Cloudy
6pm63°F17°C8 mph13 km/h WMostly Cloudy
7pm62°F17°C9 mph15 km/h WMostly Cloudy
8pm61°F16°C10 mph16 km/h WMostly Cloudy
9pm59°F15°C10 mph16 km/h WCloudy
10pm57°F14°C9 mph15 km/h WCloudy
DateLowHighWindDayNight
March 2847°F8°C63°F17°C6 mph10 km/h from WPartly CloudyCloudy
March 2944°F7°C58°F14°C12 mph19 km/h from SERainRain
March 3048°F9°C62°F17°C10 mph16 km/h from SEDrizzleDrizzle
March 3146°F8°C64°F18°C4 mph7 km/h from NMostly CloudyClear
April 146°F8°C72°F22°C6 mph9 km/h from NWClearClear
April 249°F9°C75°F24°C3 mph5 km/h from NEClearClear
April 352°F11°C75°F24°C5 mph8 km/h from NWClearPartly Cloudy

Yes

Low of 45°F7°C, High of 58°F15°C
Wind: 12 mph19 km/h
Precipitation: 60% rain

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