No

you don't need a jacket based on the weather in Ontario, CA, USA 1 second ago

60°F15°C & Mostly Clear

Wind is 2 mph3 km/h from the NW, gusting to 7 mph11 km/h
September 20
4am59°F15°C3 mph4 km/h NWPartly Cloudy
5am58°F15°C2 mph3 km/h NPartly Cloudy
6am58°F14°C1 mph2 km/h NWPartly Cloudy
7am57°F14°C2 mph4 km/h WPartly Cloudy
8am57°F14°C2 mph3 km/h NWPartly Cloudy
9am57°F14°C2 mph4 km/h NMostly Cloudy
10am57°F14°C2 mph4 km/h NEMostly Cloudy
11am59°F15°C2 mph3 km/h SWMostly Cloudy
12pm61°F16°C2 mph3 km/h SWMostly Cloudy
1pm64°F18°C2 mph4 km/h SPartly Cloudy
2pm67°F20°C2 mph4 km/h SPartly Cloudy
3pm70°F21°C3 mph5 km/h SWPartly Cloudy
DateLowHighWindDayNight
September 2057°F14°C75°F24°C5 mph8 km/h from SWPartly CloudyMostly Clear
September 2158°F15°C78°F26°C5 mph8 km/h from SWMostly ClearClear
September 2261°F16°C89°F32°C5 mph9 km/h from WClearClear
September 2364°F18°C90°F32°C6 mph9 km/h from WClearClear
September 2466°F19°C89°F32°C6 mph10 km/h from WClearMostly Clear
September 2565°F18°C87°F30°C6 mph10 km/h from WMostly ClearClear
September 2666°F19°C90°F32°C6 mph10 km/h from WClearMostly Clear

Yes

Low of 58°F15°C, High of 78°F26°C
Wind: 5 mph8 km/h
Precipitation: None

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