No
you don't need a jacket based on the weather in Ontario, CA, USA 1 second ago
67°F19°C & Clear
Wind is 3 mph5 km/h from the West, gusting to 9 mph15 km/h
| October 25 | ||||
| 5am | 65°F19°C | 2 mph3 km/h Northwest | Clear | |
| 6am | 64°F18°C | 2 mph3 km/h East | Clear | |
| 7am | 63°F17°C | 2 mph3 km/h North | Clear | |
| 8am | 62°F17°C | 4 mph6 km/h Northwest | Clear | |
| 9am | 61°F16°C | 4 mph6 km/h Northwest | Clear | |
| 10am | 61°F16°C | 2 mph2 km/h North | Mostly Clear | |
| 11am | 61°F16°C | 2 mph4 km/h Northeast | Mostly Clear | |
| 12pm | 60°F16°C | 2 mph3 km/h Northeast | Mostly Clear | |
| 1pm | 60°F15°C | 2 mph3 km/h Northwest | Mostly Clear | |
| 2pm | 58°F15°C | 3 mph5 km/h Northwest | Partly Cloudy | |
| 3pm | 59°F15°C | 3 mph4 km/h Northwest | Partly Cloudy | |
| 4pm | 62°F17°C | 2 mph3 km/h Southeast | Partly Cloudy | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| October 24 | 57°F14°C | 82°F28°C | 4 mph6 km/h from Southwest | Clear | Clear |
| October 25 | 58°F15°C | 78°F26°C | 5 mph7 km/h from Southwest | Mostly Clear | Partly Cloudy |
| October 26 | 56°F13°C | 75°F24°C | 4 mph7 km/h from Southwest | Mostly Clear | Clear |
| October 27 | 57°F14°C | 81°F27°C | 4 mph6 km/h from Southwest | Clear | Clear |
| October 28 | 63°F17°C | 90°F32°C | 3 mph4 km/h from East | Clear | Clear |
| October 29 | 64°F18°C | 91°F33°C | 3 mph5 km/h from South | Clear | Clear |
| October 30 | 65°F18°C | 88°F31°C | 4 mph6 km/h from Southwest | Clear | Mostly Clear |
Yes
Low of 58°F15°C, High of 78°F26°CWind: 5 mph7 km/h
Precipitation: None