No
you don't need a jacket based on the weather in Ontario, CA, USA 1 second ago
59°F15°C & Mostly Clear
Wind is 2 mph4 km/h from the North, gusting to 5 mph8 km/h
| May 8 | ||||
| 3am | 59°F15°C | 3 mph5 km/h Northeast | Clear | |
| 4am | 58°F14°C | 4 mph6 km/h Northeast | Clear | |
| 5am | 57°F14°C | 3 mph5 km/h Northeast | Clear | |
| 6am | 56°F13°C | 3 mph5 km/h North | Clear | |
| 7am | 56°F13°C | 3 mph4 km/h Northwest | Clear | |
| 8am | 55°F13°C | 2 mph3 km/h North | Clear | |
| 9am | 55°F13°C | 3 mph5 km/h Northeast | Clear | |
| 10am | 58°F15°C | 1 mph2 km/h Northeast | Clear | |
| 11am | 62°F17°C | 1 mph1 km/h Southeast | Clear | |
| 12pm | 67°F19°C | 2 mph3 km/h South | Clear | |
| 1pm | 72°F22°C | 2 mph3 km/h Southwest | Clear | |
| 2pm | 76°F24°C | 3 mph5 km/h Southwest | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| May 7 | 54°F12°C | 75°F24°C | 6 mph10 km/h from West | Mostly Clear | Clear |
| May 8 | 54°F12°C | 85°F29°C | 5 mph8 km/h from Southwest | Clear | Clear |
| May 9 | 65°F18°C | 95°F35°C | 5 mph7 km/h from Southwest | Clear | Clear |
| May 10 | 69°F21°C | 97°F36°C | 6 mph9 km/h from Southwest | Clear | Partly Cloudy |
| May 11 | 66°F19°C | 88°F31°C | 6 mph10 km/h from Southwest | Partly Cloudy | Partly Cloudy |
| May 12 | 55°F13°C | 75°F24°C | 7 mph12 km/h from Southwest | Partly Cloudy | Mostly Cloudy |
| May 13 | 51°F11°C | 65°F19°C | 7 mph12 km/h from Southwest | Partly Cloudy | Mostly Clear |
Yes
Low of 55°F13°C, High of 84°F29°CWind: 5 mph8 km/h
Precipitation: None