No
you don't need a jacket based on the weather in Ontario, CA 91761, USA 1 second ago
70°F21°C & Cloudy
Wind is 3 mph5 km/h from the Northeast, gusting to 6 mph9 km/h
| September 18 | ||||
| 9am | 70°F21°C | 3 mph5 km/h Northeast | Thunderstorms | |
| 10am | 69°F21°C | 4 mph6 km/h East | Thunderstorms | |
| 11am | 71°F22°C | 4 mph7 km/h East | Partly Cloudy | |
| 12pm | 74°F23°C | 4 mph6 km/h East | Partly Cloudy | |
| 1pm | 76°F25°C | 4 mph6 km/h East | Mostly Cloudy | |
| 2pm | 81°F27°C | 4 mph7 km/h Southeast | Partly Cloudy | |
| 3pm | 83°F28°C | 5 mph8 km/h Southeast | Partly Cloudy | |
| 4pm | 83°F29°C | 3 mph5 km/h South | Partly Cloudy | |
| 5pm | 84°F29°C | 5 mph7 km/h Southwest | Partly Cloudy | |
| 6pm | 84°F29°C | 7 mph11 km/h Southwest | Partly Cloudy | |
| 7pm | 84°F29°C | 7 mph12 km/h Southwest | Partly Cloudy | |
| 8pm | 83°F28°C | 7 mph12 km/h Southwest | Partly Cloudy | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 18 | 69°F21°C | 84°F29°C | 5 mph9 km/h from South | Thunderstorms | Partly Cloudy |
| September 19 | 68°F20°C | 85°F30°C | 4 mph7 km/h from Southwest | Mostly Clear | Clear |
| September 20 | 66°F19°C | 89°F32°C | 5 mph8 km/h from West | Clear | Clear |
| September 21 | 66°F19°C | 88°F31°C | 4 mph7 km/h from Southwest | Mostly Clear | Mostly Clear |
| September 22 | 69°F21°C | 93°F34°C | 5 mph8 km/h from West | Mostly Clear | Clear |
| September 23 | 70°F21°C | 92°F34°C | 6 mph9 km/h from Southwest | Clear | Clear |
| September 24 | 70°F21°C | 93°F34°C | 6 mph9 km/h from Southwest | Clear | Clear |
No
Low of 68°F20°C, High of 85°F30°CWind: 4 mph7 km/h
Precipitation: None