No
you don't need a jacket based on the weather in Diamond Bar, CA, USA 1 second ago
60°F16°C & Clear
Wind is 5 mph8 km/h from the Southeast, gusting to 7 mph11 km/h
| January 9 | ||||
| 10pm | 58°F15°C | 5 mph9 km/h East | Clear | |
| 11pm | 57°F14°C | 6 mph9 km/h East | Clear | |
| January 10 | ||||
| 12am | 55°F13°C | 7 mph12 km/h East | Clear | |
| 1am | 54°F12°C | 8 mph13 km/h East | Clear | |
| 2am | 54°F12°C | 12 mph20 km/h East | Clear | |
| 3am | 53°F12°C | 13 mph21 km/h Northeast | Clear | |
| 4am | 53°F11°C | 12 mph20 km/h Northeast | Clear | |
| 5am | 51°F10°C | 7 mph12 km/h East | Clear | |
| 6am | 50°F10°C | 8 mph13 km/h East | Clear | |
| 7am | 49°F9°C | 6 mph9 km/h Northeast | Clear | |
| 8am | 48°F9°C | 5 mph9 km/h Northeast | Clear | |
| 9am | 47°F9°C | 5 mph9 km/h East | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| January 9 | 47°F9°C | 72°F22°C | 4 mph6 km/h from West | Clear | Clear |
| January 10 | 47°F8°C | 68°F20°C | 4 mph7 km/h from West | Clear | Clear |
| January 11 | 44°F7°C | 67°F20°C | 4 mph7 km/h from North | Clear | Clear |
| January 12 | 45°F7°C | 66°F19°C | 5 mph9 km/h from North | Clear | Clear |
| January 13 | 40°F5°C | 64°F18°C | 7 mph11 km/h from East | Mostly Clear | Clear |
| January 14 | 43°F6°C | 67°F19°C | 7 mph11 km/h from East | Clear | Mostly Clear |
| January 15 | 46°F8°C | 71°F22°C | 4 mph7 km/h from East | Clear | Clear |
Yes
Low of 47°F9°C, High of 68°F20°CWind: 4 mph7 km/h
Precipitation: None