No
you don't need a jacket based on the weather in Ontario, CA, USA 1 second ago
60°F15°C & Mostly Clear
Wind is 2 mph3 km/h from the NW, gusting to 7 mph11 km/h
| September 20 | ||||
| 4am | 59°F15°C | 3 mph4 km/h NW | Partly Cloudy | |
| 5am | 58°F15°C | 2 mph3 km/h N | Partly Cloudy | |
| 6am | 58°F14°C | 1 mph2 km/h NW | Partly Cloudy | |
| 7am | 57°F14°C | 2 mph4 km/h W | Partly Cloudy | |
| 8am | 57°F14°C | 2 mph3 km/h NW | Partly Cloudy | |
| 9am | 57°F14°C | 2 mph4 km/h N | Mostly Cloudy | |
| 10am | 57°F14°C | 2 mph4 km/h NE | Mostly Cloudy | |
| 11am | 59°F15°C | 2 mph3 km/h SW | Mostly Cloudy | |
| 12pm | 61°F16°C | 2 mph3 km/h SW | Mostly Cloudy | |
| 1pm | 64°F18°C | 2 mph4 km/h S | Partly Cloudy | |
| 2pm | 67°F20°C | 2 mph4 km/h S | Partly Cloudy | |
| 3pm | 70°F21°C | 3 mph5 km/h SW | Partly Cloudy | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 20 | 57°F14°C | 75°F24°C | 5 mph8 km/h from SW | Partly Cloudy | Mostly Clear |
| September 21 | 58°F15°C | 78°F26°C | 5 mph8 km/h from SW | Mostly Clear | Clear |
| September 22 | 61°F16°C | 89°F32°C | 5 mph9 km/h from W | Clear | Clear |
| September 23 | 64°F18°C | 90°F32°C | 6 mph9 km/h from W | Clear | Clear |
| September 24 | 66°F19°C | 89°F32°C | 6 mph10 km/h from W | Clear | Mostly Clear |
| September 25 | 65°F18°C | 87°F30°C | 6 mph10 km/h from W | Mostly Clear | Clear |
| September 26 | 66°F19°C | 90°F32°C | 6 mph10 km/h from W | Clear | Mostly Clear |
Yes
Low of 58°F15°C, High of 78°F26°CWind: 5 mph8 km/h
Precipitation: None