No
you don't need a jacket based on the weather in Ontario, CA 91761, USA 1 second ago
69°F21°C & Clear
Wind is 4 mph7 km/h from the West, gusting to 12 mph19 km/h
| October 21 | ||||
| 4am | 69°F20°C | 5 mph7 km/h West | Clear | |
| 5am | 66°F19°C | 3 mph5 km/h East | Clear | |
| 6am | 64°F18°C | 2 mph4 km/h East | Clear | |
| 7am | 63°F17°C | 3 mph5 km/h Northeast | Clear | |
| 8am | 61°F16°C | 4 mph6 km/h Northeast | Clear | |
| 9am | 60°F16°C | 4 mph6 km/h Northeast | Clear | |
| 10am | 59°F15°C | 4 mph6 km/h Northeast | Clear | |
| 11am | 60°F15°C | 2 mph4 km/h Northeast | Clear | |
| 12pm | 59°F15°C | 2 mph3 km/h Northeast | Clear | |
| 1pm | 58°F14°C | 2 mph4 km/h Northeast | Clear | |
| 2pm | 57°F14°C | 2 mph4 km/h Northeast | Clear | |
| 3pm | 59°F15°C | 3 mph4 km/h Northeast | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| October 20 | 56°F13°C | 87°F30°C | 2 mph4 km/h from West | Clear | Clear |
| October 21 | 57°F14°C | 83°F28°C | 5 mph8 km/h from West | Mostly Clear | Partly Cloudy |
| October 22 | 57°F14°C | 72°F22°C | 6 mph10 km/h from Southwest | Mostly Clear | Mostly Clear |
| October 23 | 54°F12°C | 76°F24°C | 4 mph7 km/h from Southwest | Clear | Clear |
| October 24 | 57°F14°C | 83°F28°C | 4 mph6 km/h from West | Clear | Mostly Clear |
| October 25 | 58°F14°C | 80°F26°C | 4 mph7 km/h from Southwest | Mostly Clear | Mostly Cloudy |
| October 26 | 57°F14°C | 73°F23°C | 4 mph7 km/h from West | Partly Cloudy | Mostly Clear |
Yes
Low of 57°F14°C, High of 83°F29°CWind: 5 mph8 km/h
Precipitation: None