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 | ||||
| 8pm | 56°F13°C | 3 mph5 km/h Southwest | Clear | |
| 9pm | 52°F11°C | 4 mph7 km/h West | Clear | |
| 10pm | 49°F10°C | 4 mph6 km/h West | Clear | |
| 11pm | 47°F9°C | 4 mph6 km/h West | Clear | |
| January 31 | ||||
| 12am | 46°F8°C | 3 mph5 km/h Northwest | Clear | |
| 1am | 44°F7°C | 2 mph4 km/h North | Clear | |
| 2am | 44°F6°C | 4 mph6 km/h Northwest | Clear | |
| 3am | 44°F7°C | 3 mph4 km/h North | Clear | |
| 4am | 43°F6°C | 3 mph4 km/h Northeast | Clear | |
| 5am | 42°F6°C | 3 mph5 km/h Northeast | Clear | |
| 6am | 42°F5°C | 3 mph4 km/h Northeast | Mostly Clear | |
| 7am | 41°F5°C | 2 mph4 km/h Northeast | Mostly Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| January 30 | 43°F6°C | 58°F14°C | 3 mph5 km/h from Southwest | Partly Cloudy | Mostly Clear |
| January 31 | 40°F4°C | 62°F17°C | 3 mph5 km/h from Southwest | Mostly Cloudy | Partly Cloudy |
| February 1 | 46°F8°C | 66°F19°C | 4 mph6 km/h from Southwest | Partly Cloudy | Mostly Clear |
| February 2 | 48°F9°C | 71°F22°C | 3 mph5 km/h from Southwest | Clear | Mostly Clear |
| February 3 | 52°F11°C | 71°F22°C | 4 mph6 km/h from West | Mostly Cloudy | Mostly Cloudy |
| February 4 | 48°F9°C | 60°F16°C | 5 mph8 km/h from Southwest | Partly Cloudy | Rain |
| February 5 | 46°F8°C | 56°F13°C | 4 mph6 km/h from Southwest | Rain | Partly Cloudy |
Yes
Low of 40°F5°C, High of 63°F17°CWind: 3 mph5 km/h
Precipitation: None