No
you don't need a jacket based on the weather in Ontario, CA, USA 1 second ago
81°F27°C & Clear
Wind is 6 mph9 km/h from the West, gusting to 13 mph21 km/h
| September 16 | ||||
| 12am | 79°F26°C | 6 mph9 km/h West | Clear | |
| 1am | 76°F24°C | 5 mph8 km/h West | Clear | |
| 2am | 74°F23°C | 3 mph5 km/h West | Clear | |
| 3am | 72°F22°C | 4 mph6 km/h Northeast | Clear | |
| 4am | 71°F22°C | 4 mph7 km/h Northeast | Clear | |
| 5am | 71°F22°C | 4 mph7 km/h Northeast | Clear | |
| 6am | 71°F22°C | 4 mph7 km/h Northeast | Clear | |
| 7am | 70°F21°C | 3 mph5 km/h Northeast | Clear | |
| 8am | 70°F21°C | 3 mph5 km/h Northeast | Clear | |
| 9am | 69°F20°C | 3 mph5 km/h Northeast | Clear | |
| 10am | 69°F21°C | 3 mph5 km/h Northeast | Clear | |
| 11am | 73°F23°C | 2 mph4 km/h Northeast | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 15 | 62°F17°C | 93°F34°C | 4 mph7 km/h from West | Clear | Clear |
| September 16 | 69°F20°C | 94°F34°C | 6 mph9 km/h from Southwest | Clear | Mostly Clear |
| September 17 | 70°F21°C | 90°F32°C | 6 mph9 km/h from Southwest | Mostly Cloudy | Mostly Cloudy |
| September 18 | 70°F21°C | 84°F29°C | 5 mph8 km/h from Southwest | Mostly Cloudy | Partly Cloudy |
| September 19 | 69°F21°C | 87°F30°C | 4 mph6 km/h from Southwest | Mostly Clear | Mostly Clear |
| September 20 | 69°F20°C | 90°F32°C | 5 mph8 km/h from Southwest | Mostly Clear | Mostly Clear |
| September 21 | 69°F20°C | 90°F32°C | 5 mph8 km/h from West | Clear | Mostly Clear |
No
Low of 69°F21°C, High of 94°F35°CWind: 6 mph9 km/h
Precipitation: None