No
you don't need a jacket based on the weather in Castro Valley, CA, USA 1 second ago
60°F16°C & Clear
Wind is 1 mph1 km/h from the East, gusting to 1 mph2 km/h
| September 17 | ||||
| 7am | 60°F15°C | 1 mph1 km/h South | Clear | |
| 8am | 58°F15°C | 1 mph1 km/h Northeast | Clear | |
| 9am | 58°F14°C | 1 mph2 km/h Southwest | Clear | |
| 10am | 57°F14°C | 2 mph3 km/h Northeast | Clear | |
| 11am | 61°F16°C | 1 mph2 km/h North | Clear | |
| 12pm | 66°F19°C | 2 mph3 km/h West | Clear | |
| 1pm | 71°F22°C | 3 mph5 km/h West | Clear | |
| 2pm | 76°F25°C | 4 mph6 km/h West | Clear | |
| 3pm | 81°F27°C | 4 mph7 km/h West | Clear | |
| 4pm | 85°F29°C | 5 mph9 km/h West | Clear | |
| 5pm | 87°F31°C | 6 mph10 km/h West | Clear | |
| 6pm | 88°F31°C | 7 mph12 km/h West | Mostly Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 17 | 57°F14°C | 88°F31°C | 5 mph8 km/h from West | Mostly Clear | Mostly Cloudy |
| September 18 | 61°F16°C | 75°F24°C | 5 mph8 km/h from Southwest | Mostly Cloudy | Cloudy |
| September 19 | 61°F16°C | 75°F24°C | 4 mph7 km/h from West | Partly Cloudy | Mostly Clear |
| September 20 | 58°F14°C | 79°F26°C | 5 mph7 km/h from West | Mostly Clear | Mostly Clear |
| September 21 | 57°F14°C | 80°F27°C | 4 mph7 km/h from West | Mostly Clear | Clear |
| September 22 | 58°F14°C | 89°F32°C | 4 mph6 km/h from West | Mostly Clear | Partly Cloudy |
| September 23 | 61°F16°C | 78°F25°C | 5 mph7 km/h from West | Drizzle | Partly Cloudy |
No
Low of 61°F16°C, High of 75°F24°CWind: 5 mph8 km/h
Precipitation: 29% rain