No
you don't need a jacket based on the weather in Walnut Creek, CA, USA 21 minutes ago
68°F20°C & Cloudy
Wind is 5 mph8 km/h from the South, gusting to 9 mph15 km/h
| September 19 | ||||
| 2am | 67°F20°C | 5 mph8 km/h South | Mostly Cloudy | |
| 3am | 66°F19°C | 6 mph10 km/h Southwest | Cloudy | |
| 4am | 66°F19°C | 6 mph10 km/h Southwest | Cloudy | |
| 5am | 66°F19°C | 5 mph8 km/h Southwest | Cloudy | |
| 6am | 65°F19°C | 5 mph8 km/h Southwest | Cloudy | |
| 7am | 65°F18°C | 5 mph9 km/h Southwest | Cloudy | |
| 8am | 64°F18°C | 3 mph5 km/h West | Cloudy | |
| 9am | 62°F17°C | 3 mph4 km/h Southwest | Mostly Cloudy | |
| 10am | 62°F17°C | 3 mph4 km/h Southwest | Mostly Cloudy | |
| 11am | 63°F17°C | 3 mph5 km/h Southwest | Mostly Cloudy | |
| 12pm | 65°F18°C | 3 mph5 km/h Southwest | Mostly Cloudy | |
| 1pm | 68°F20°C | 3 mph5 km/h West | Mostly Cloudy | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 18 | 66°F19°C | 80°F27°C | 5 mph8 km/h from Southwest | Partly Cloudy | Cloudy |
| September 19 | 62°F17°C | 78°F25°C | 4 mph7 km/h from West | Partly Cloudy | Partly Cloudy |
| September 20 | 58°F14°C | 80°F27°C | 6 mph10 km/h from West | Mostly Clear | Mostly Clear |
| September 21 | 58°F15°C | 81°F27°C | 7 mph11 km/h from Southwest | Mostly Clear | Clear |
| September 22 | 59°F15°C | 89°F32°C | 4 mph7 km/h from West | Clear | Mostly Clear |
| September 23 | 64°F18°C | 83°F28°C | 6 mph9 km/h from Southwest | Partly Cloudy | Partly Cloudy |
| September 24 | 62°F17°C | 78°F26°C | 6 mph10 km/h from West | Mostly Clear | Mostly Clear |
No
Low of 62°F17°C, High of 78°F26°CWind: 4 mph7 km/h
Precipitation: None