No
you don't need a jacket based on the weather in Diamond Bar, CA, USA 1 second ago
67°F19°C & Clear
Wind is 4 mph7 km/h from the Southwest, gusting to 12 mph19 km/h
| October 13 | ||||
| 3am | 66°F19°C | 4 mph7 km/h Southwest | Clear | |
| 4am | 64°F18°C | 3 mph4 km/h Southwest | Clear | |
| 5am | 62°F17°C | 3 mph4 km/h North | Clear | |
| 6am | 61°F16°C | 2 mph3 km/h Northeast | Clear | |
| 7am | 60°F15°C | 2 mph4 km/h Southeast | Clear | |
| 8am | 59°F15°C | 2 mph3 km/h South | Clear | |
| 9am | 58°F14°C | 2 mph4 km/h North | Clear | |
| 10am | 57°F14°C | 3 mph5 km/h North | Mostly Clear | |
| 11am | 57°F14°C | 3 mph4 km/h North | Mostly Clear | |
| 12pm | 56°F14°C | 3 mph4 km/h Northeast | Mostly Clear | |
| 1pm | 56°F13°C | 3 mph4 km/h Northeast | Mostly Clear | |
| 2pm | 55°F13°C | 3 mph5 km/h East | Mostly Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| October 12 | 55°F13°C | 78°F26°C | 4 mph6 km/h from Southwest | Clear | Clear |
| October 13 | 55°F13°C | 72°F22°C | 7 mph11 km/h from South | Partly Cloudy | Rain |
| October 14 | 54°F12°C | 62°F17°C | 7 mph11 km/h from Southwest | Rain | Partly Cloudy |
| October 15 | 50°F10°C | 68°F20°C | 4 mph6 km/h from Southwest | Mostly Clear | Clear |
| October 16 | 49°F10°C | 73°F23°C | 3 mph5 km/h from West | Clear | Clear |
| October 17 | 54°F12°C | 77°F25°C | 3 mph5 km/h from Southwest | Clear | Clear |
| October 18 | 57°F14°C | 80°F27°C | 3 mph5 km/h from West | Clear | Mostly Clear |
Yes
Low of 55°F13°C, High of 72°F22°CWind: 7 mph11 km/h
Precipitation: 10% rain