No
you don't need a jacket based on the weather in Ontario, CA, USA 1 second ago
73°F23°C & Mostly Cloudy
Wind is 4 mph6 km/h from the Southwest, gusting to 6 mph10 km/h
| September 11 | ||||
| 2pm | 73°F23°C | 4 mph6 km/h Southwest | Clear | |
| 3pm | 76°F24°C | 6 mph9 km/h Southwest | Clear | |
| 4pm | 78°F26°C | 7 mph11 km/h Southwest | Clear | |
| 5pm | 80°F27°C | 9 mph14 km/h Southwest | Clear | |
| 6pm | 80°F27°C | 10 mph16 km/h Southwest | Clear | |
| 7pm | 80°F26°C | 11 mph17 km/h Southwest | Clear | |
| 8pm | 78°F26°C | 10 mph16 km/h Southwest | Clear | |
| 9pm | 76°F24°C | 9 mph14 km/h Southwest | Clear | |
| 10pm | 73°F23°C | 8 mph12 km/h Southwest | Clear | |
| 11pm | 70°F21°C | 6 mph10 km/h Southwest | Clear | |
| September 12 | ||||
| 12am | 68°F20°C | 5 mph7 km/h West | Clear | |
| 1am | 66°F19°C | 3 mph6 km/h West | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 11 | 62°F17°C | 80°F27°C | 6 mph10 km/h from Southwest | Mostly Clear | Clear |
| September 12 | 60°F15°C | 80°F27°C | 6 mph9 km/h from Southwest | Mostly Clear | Mostly Clear |
| September 13 | 61°F16°C | 84°F29°C | 6 mph9 km/h from Southwest | Clear | Clear |
| September 14 | 63°F17°C | 87°F31°C | 5 mph9 km/h from Southwest | Clear | Clear |
| September 15 | 66°F19°C | 92°F33°C | 5 mph8 km/h from Southwest | Clear | Clear |
| September 16 | 69°F21°C | 96°F36°C | 5 mph8 km/h from Southwest | Clear | Mostly Clear |
| September 17 | 73°F23°C | 96°F35°C | 5 mph9 km/h from Southwest | Mostly Clear | Partly Cloudy |
No
Low of 60°F16°C, High of 80°F27°CWind: 6 mph9 km/h
Precipitation: None