No
you don't need a jacket based on the weather in Rancho Cucamonga, CA, USA 1 second ago
63°F17°C & Clear
Wind is 3 mph5 km/h from the West, gusting to 11 mph17 km/h
| September 12 | ||||
| 3am | 62°F17°C | 2 mph3 km/h Southwest | Clear | |
| 4am | 61°F16°C | 1 mph1 km/h Northwest | Clear | |
| 5am | 60°F16°C | 2 mph3 km/h Northeast | Clear | |
| 6am | 60°F15°C | 2 mph3 km/h North | Clear | |
| 7am | 59°F15°C | 2 mph3 km/h Northeast | Clear | |
| 8am | 59°F15°C | 2 mph4 km/h Northwest | Clear | |
| 9am | 58°F15°C | 3 mph5 km/h West | Clear | |
| 10am | 59°F15°C | 2 mph3 km/h Northwest | Mostly Clear | |
| 11am | 62°F17°C | 1 mph2 km/h Southwest | Partly Cloudy | |
| 12pm | 64°F18°C | 3 mph4 km/h Southwest | Partly Cloudy | |
| 1pm | 67°F19°C | 3 mph5 km/h South | Partly Cloudy | |
| 2pm | 71°F22°C | 4 mph6 km/h Southwest | Mostly Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 11 | 61°F16°C | 79°F26°C | 5 mph8 km/h from Southwest | Mostly Clear | Clear |
| September 12 | 58°F15°C | 80°F26°C | 6 mph9 km/h from Southwest | Mostly Clear | Mostly Clear |
| September 13 | 61°F16°C | 83°F28°C | 5 mph9 km/h from Southwest | Clear | Clear |
| September 14 | 63°F17°C | 87°F31°C | 5 mph9 km/h from Southwest | Clear | Clear |
| September 15 | 66°F19°C | 90°F32°C | 5 mph8 km/h from Southwest | Clear | Clear |
| September 16 | 69°F20°C | 93°F34°C | 5 mph8 km/h from Southwest | Clear | Mostly Clear |
| September 17 | 70°F21°C | 93°F34°C | 6 mph9 km/h from Southwest | Mostly Clear | Partly Cloudy |
Yes
Low of 58°F15°C, High of 80°F27°CWind: 6 mph9 km/h
Precipitation: None