Yes

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

Why? Because it's pretty chilly.
52°F11°C & Mostly Clear

Wind is 2 mph3 km/h from the SW, gusting to 4 mph7 km/h
April 20
8am52°F11°C2 mph4 km/h SWPartly Cloudy
9am51°F10°C3 mph4 km/h SWMostly Cloudy
10am52°F11°C3 mph4 km/h SWMostly Cloudy
11am55°F13°C2 mph3 km/h WMostly Cloudy
12pm60°F15°C2 mph4 km/h NWPartly Cloudy
1pm65°F18°C4 mph6 km/h NWMostly Clear
2pm70°F21°C5 mph8 km/h NWMostly Clear
3pm74°F23°C6 mph9 km/h NWClear
4pm77°F25°C7 mph12 km/h NWClear
5pm80°F27°C9 mph14 km/h NWClear
6pm81°F27°C10 mph16 km/h WClear
7pm82°F28°C11 mph18 km/h WClear
DateLowHighWindDayNight
April 2051°F10°C82°F28°C7 mph12 km/h from WMostly ClearClear
April 2153°F12°C84°F29°C7 mph11 km/h from NWClearClear
April 2256°F13°C85°F30°C5 mph8 km/h from NWMostly ClearMostly Clear
April 2353°F12°C76°F24°C4 mph7 km/h from NWMostly ClearMostly Clear
April 2451°F10°C73°F23°C7 mph11 km/h from WPartly CloudyMostly Clear
April 2551°F10°C71°F22°C11 mph18 km/h from WPartly CloudyPartly Cloudy
April 2654°F12°C68°F20°C12 mph19 km/h from WPartly CloudyClear

Yes

Low of 54°F12°C, High of 84°F29°C
Wind: 7 mph11 km/h
Precipitation: None

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