No
you don't need a jacket based on the weather in Rancho Cucamonga, CA, USA 1 second ago
65°F18°C & Mostly Cloudy
Wind is 4 mph7 km/h from the West, gusting to 6 mph10 km/h
| September 12 | ||||
| 12pm | 65°F18°C | 4 mph7 km/h West | Mostly Clear | |
| 1pm | 68°F20°C | 4 mph6 km/h Southwest | Mostly Clear | |
| 2pm | 72°F22°C | 5 mph7 km/h Southwest | Clear | |
| 3pm | 75°F24°C | 6 mph9 km/h Southwest | Clear | |
| 4pm | 77°F25°C | 7 mph11 km/h Southwest | Clear | |
| 5pm | 79°F26°C | 9 mph14 km/h Southwest | Clear | |
| 6pm | 79°F26°C | 11 mph17 km/h Southwest | Clear | |
| 7pm | 79°F26°C | 10 mph16 km/h Southwest | Clear | |
| 8pm | 77°F25°C | 10 mph16 km/h Southwest | Clear | |
| 9pm | 75°F24°C | 9 mph15 km/h Southwest | Clear | |
| 10pm | 72°F22°C | 8 mph12 km/h Southwest | Clear | |
| 11pm | 70°F21°C | 6 mph10 km/h Southwest | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 12 | 60°F16°C | 79°F26°C | 7 mph11 km/h from Southwest | Mostly Clear | Mostly Clear |
| September 13 | 61°F16°C | 84°F29°C | 5 mph9 km/h from Southwest | Clear | Clear |
| September 14 | 64°F18°C | 88°F31°C | 5 mph9 km/h from Southwest | Clear | Clear |
| September 15 | 67°F19°C | 91°F33°C | 5 mph9 km/h from Southwest | Clear | Clear |
| September 16 | 68°F20°C | 92°F33°C | 5 mph8 km/h from Southwest | Clear | Mostly Clear |
| September 17 | 70°F21°C | 92°F33°C | 5 mph9 km/h from Southwest | Mostly Clear | Mostly Clear |
| September 18 | 71°F22°C | 86°F30°C | 5 mph8 km/h from Southwest | Partly Cloudy | Mostly Clear |
No
Low of 61°F16°C, High of 83°F29°CWind: 5 mph9 km/h
Precipitation: None