No
you don't need a jacket based on the weather in Ontario, CA, USA 1 second ago
72°F22°C & Clear
Wind is 7 mph12 km/h from the West, gusting to 12 mph20 km/h
| October 27 | ||||
| 12am | 71°F22°C | 7 mph12 km/h West | Clear | |
| 1am | 68°F20°C | 5 mph8 km/h West | Clear | |
| 2am | 65°F18°C | 4 mph6 km/h West | Clear | |
| 3am | 63°F17°C | 3 mph5 km/h West | Clear | |
| 4am | 61°F16°C | 3 mph5 km/h West | Clear | |
| 5am | 60°F16°C | 3 mph5 km/h Northwest | Clear | |
| 6am | 60°F16°C | 2 mph3 km/h Northwest | Clear | |
| 7am | 59°F15°C | 2 mph3 km/h Northwest | Clear | |
| 8am | 59°F15°C | 2 mph3 km/h North | Clear | |
| 9am | 58°F14°C | 2 mph4 km/h North | Clear | |
| 10am | 57°F14°C | 2 mph4 km/h North | Clear | |
| 11am | 56°F13°C | 2 mph3 km/h Northeast | Mostly Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| October 26 | 54°F12°C | 73°F23°C | 4 mph6 km/h from West | Partly Cloudy | Clear |
| October 27 | 55°F13°C | 77°F25°C | 3 mph5 km/h from Southwest | Clear | Clear |
| October 28 | 61°F16°C | 89°F32°C | 5 mph8 km/h from Northeast | Clear | Clear |
| October 29 | 65°F18°C | 90°F32°C | 4 mph7 km/h from Northeast | Clear | Clear |
| October 30 | 66°F19°C | 87°F31°C | 4 mph6 km/h from West | Clear | Mostly Clear |
| October 31 | 62°F17°C | 84°F29°C | 3 mph6 km/h from Southwest | Mostly Clear | Clear |
| November 1 | 61°F16°C | 82°F28°C | 3 mph6 km/h from West | Clear | Clear |
Yes
Low of 55°F13°C, High of 77°F25°CWind: 3 mph5 km/h
Precipitation: None