No
you don't need a jacket based on the weather in Rancho Cucamonga, CA, USA 1 second ago
80°F27°C & Clear
Wind is 3 mph5 km/h from the Southwest, gusting to 5 mph8 km/h
| September 22 | ||||
| 4pm | 83°F29°C | 6 mph9 km/h Southwest | Clear | |
| 5pm | 85°F30°C | 5 mph8 km/h Southwest | Clear | |
| 6pm | 86°F30°C | 7 mph12 km/h Southwest | Clear | |
| 7pm | 86°F30°C | 9 mph14 km/h Southwest | Clear | |
| 8pm | 85°F29°C | 9 mph15 km/h West | Clear | |
| 9pm | 83°F29°C | 8 mph14 km/h West | Clear | |
| 10pm | 80°F27°C | 6 mph9 km/h West | Mostly Clear | |
| 11pm | 78°F26°C | 4 mph6 km/h West | Mostly Clear | |
| September 23 | ||||
| 12am | 76°F25°C | 2 mph3 km/h Southwest | Clear | |
| 1am | 75°F24°C | 2 mph3 km/h North | Clear | |
| 2am | 74°F23°C | 2 mph3 km/h North | Clear | |
| 3am | 73°F23°C | 2 mph4 km/h Northeast | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 22 | 67°F20°C | 86°F30°C | 5 mph8 km/h from Southwest | Mostly Clear | Clear |
| September 23 | 71°F22°C | 92°F33°C | 5 mph8 km/h from Southwest | Mostly Clear | Clear |
| September 24 | 69°F20°C | 86°F30°C | 6 mph10 km/h from Southwest | Clear | Clear |
| September 25 | 63°F17°C | 81°F27°C | 6 mph9 km/h from Southwest | Clear | Mostly Clear |
| September 26 | 62°F17°C | 78°F25°C | 5 mph8 km/h from Southwest | Partly Cloudy | Partly Cloudy |
| September 27 | 62°F17°C | 79°F26°C | 4 mph7 km/h from Southwest | Partly Cloudy | Mostly Clear |
| September 28 | 65°F18°C | 84°F29°C | 5 mph8 km/h from Southwest | Clear | Clear |
No
Low of 71°F22°C, High of 92°F34°CWind: 5 mph8 km/h
Precipitation: None