Yes

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

Why? Because it's not very warm out!
57°F14°C & Mostly Clear

Wind is 3 mph5 km/h from the Southwest, gusting to 4 mph7 km/h
January 30
8pm56°F13°C3 mph5 km/h SouthwestClear
9pm52°F11°C4 mph7 km/h WestClear
10pm49°F10°C4 mph6 km/h WestClear
11pm47°F9°C4 mph6 km/h WestClear
January 31
12am46°F8°C3 mph5 km/h NorthwestClear
1am44°F7°C2 mph4 km/h NorthClear
2am44°F6°C4 mph6 km/h NorthwestClear
3am44°F7°C3 mph4 km/h NorthClear
4am43°F6°C3 mph4 km/h NortheastClear
5am42°F6°C3 mph5 km/h NortheastClear
6am42°F5°C3 mph4 km/h NortheastMostly Clear
7am41°F5°C2 mph4 km/h NortheastMostly Clear
DateLowHighWindDayNight
January 3043°F6°C58°F14°C3 mph5 km/h from SouthwestPartly CloudyMostly Clear
January 3140°F4°C62°F17°C3 mph5 km/h from SouthwestMostly CloudyPartly Cloudy
February 146°F8°C66°F19°C4 mph6 km/h from SouthwestPartly CloudyMostly Clear
February 248°F9°C71°F22°C3 mph5 km/h from SouthwestClearMostly Clear
February 352°F11°C71°F22°C4 mph6 km/h from WestMostly CloudyMostly Cloudy
February 448°F9°C60°F16°C5 mph8 km/h from SouthwestPartly CloudyRain
February 546°F8°C56°F13°C4 mph6 km/h from SouthwestRainPartly Cloudy

Yes

Low of 40°F5°C, High of 63°F17°C
Wind: 3 mph5 km/h
Precipitation: None

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