No
you don't need a jacket based on the weather in Diamond Bar, CA, USA 1 second ago
93°F34°C & Clear
Wind is 9 mph15 km/h from the Southwest, gusting to 16 mph25 km/h
| September 3 | ||||
| 9pm | 91°F33°C | 9 mph15 km/h West | Clear | |
| 10pm | 87°F31°C | 7 mph12 km/h West | Clear | |
| 11pm | 84°F29°C | 6 mph9 km/h Southwest | Clear | |
| September 4 | ||||
| 12am | 81°F27°C | 4 mph7 km/h Southwest | Clear | |
| 1am | 78°F26°C | 2 mph3 km/h South | Clear | |
| 2am | 77°F25°C | 2 mph3 km/h West | Clear | |
| 3am | 75°F24°C | 2 mph3 km/h Southwest | Clear | |
| 4am | 74°F23°C | 2 mph3 km/h Southwest | Clear | |
| 5am | 73°F23°C | 1 mph2 km/h Southwest | Clear | |
| 6am | 71°F22°C | 1 mph2 km/h Southwest | Clear | |
| 7am | 70°F21°C | 2 mph2 km/h West | Clear | |
| 8am | 69°F21°C | 1 mph2 km/h West | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 3 | 69°F20°C | 95°F35°C | 5 mph9 km/h from Southwest | Clear | Clear |
| September 4 | 69°F21°C | 93°F34°C | 6 mph10 km/h from Southwest | Clear | Clear |
| September 5 | 66°F19°C | 91°F33°C | 6 mph9 km/h from Southwest | Clear | Clear |
| September 6 | 64°F18°C | 90°F32°C | 5 mph9 km/h from Southwest | Clear | Clear |
| September 7 | 63°F17°C | 91°F33°C | 5 mph8 km/h from Southwest | Clear | Clear |
| September 8 | 61°F16°C | 85°F29°C | 6 mph9 km/h from Southwest | Clear | Mostly Clear |
| September 9 | 62°F17°C | 80°F27°C | 6 mph9 km/h from Southwest | Mostly Clear | Partly Cloudy |
No
Low of 69°F21°C, High of 93°F34°CWind: 6 mph10 km/h
Precipitation: None