No
you don't need a jacket based on the weather in Walnut Creek, CA, USA 1 second ago
77°F25°C & Clear
Wind is 6 mph9 km/h from the West, gusting to 9 mph15 km/h
| September 14 | ||||
| 4pm | 79°F26°C | 6 mph10 km/h West | Clear | |
| 5pm | 81°F27°C | 7 mph11 km/h West | Clear | |
| 6pm | 83°F28°C | 8 mph12 km/h West | Clear | |
| 7pm | 83°F28°C | 9 mph14 km/h West | Clear | |
| 8pm | 81°F27°C | 9 mph14 km/h West | Clear | |
| 9pm | 79°F26°C | 8 mph13 km/h Southwest | Clear | |
| 10pm | 74°F23°C | 7 mph11 km/h Southwest | Clear | |
| 11pm | 70°F21°C | 6 mph10 km/h Southwest | Clear | |
| September 15 | ||||
| 12am | 67°F19°C | 6 mph10 km/h Southwest | Clear | |
| 1am | 65°F18°C | 6 mph10 km/h Southwest | Clear | |
| 2am | 64°F18°C | 6 mph9 km/h Southwest | Mostly Clear | |
| 3am | 63°F17°C | 6 mph9 km/h Southwest | Mostly Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 14 | 59°F15°C | 83°F28°C | 6 mph10 km/h from Southwest | Clear | Mostly Clear |
| September 15 | 57°F14°C | 89°F32°C | 3 mph6 km/h from North | Clear | Clear |
| September 16 | 59°F15°C | 89°F32°C | 4 mph7 km/h from West | Clear | Clear |
| September 17 | 59°F15°C | 89°F32°C | 5 mph8 km/h from West | Mostly Clear | Mostly Clear |
| September 18 | 59°F15°C | 82°F28°C | 6 mph10 km/h from Southwest | Partly Cloudy | Mostly Cloudy |
| September 19 | 60°F16°C | 78°F25°C | 6 mph10 km/h from Southwest | Partly Cloudy | Partly Cloudy |
| September 20 | 59°F15°C | 75°F24°C | 6 mph10 km/h from Southwest | Mostly Clear | Partly Cloudy |
Yes
Low of 56°F14°C, High of 89°F32°CWind: 3 mph6 km/h
Precipitation: None