No
you don't need a jacket based on the weather in Castro Valley, CA 94552, USA 1 second ago
68°F20°C & Mostly Clear
Wind is 2 mph4 km/h from the SW, gusting to 6 mph9 km/h
| September 21 | ||||
| 2pm | 69°F21°C | 3 mph4 km/h SW | Clear | |
| 3pm | 74°F23°C | 4 mph6 km/h W | Clear | |
| 4pm | 77°F25°C | 5 mph8 km/h W | Clear | |
| 5pm | 79°F26°C | 6 mph10 km/h W | Clear | |
| 6pm | 79°F26°C | 7 mph12 km/h W | Clear | |
| 7pm | 77°F25°C | 7 mph12 km/h W | Clear | |
| 8pm | 75°F24°C | 7 mph11 km/h W | Clear | |
| 9pm | 71°F22°C | 6 mph10 km/h W | Clear | |
| 10pm | 66°F19°C | 5 mph8 km/h W | Clear | |
| 11pm | 63°F17°C | 4 mph7 km/h W | Clear | |
| September 22 | ||||
| 12am | 61°F16°C | 4 mph6 km/h W | Clear | |
| 1am | 59°F15°C | 3 mph5 km/h W | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 21 | 54°F12°C | 79°F26°C | 5 mph7 km/h from W | Mostly Clear | Mostly Clear |
| September 22 | 52°F11°C | 82°F28°C | 4 mph7 km/h from W | Clear | Clear |
| September 23 | 56°F13°C | 91°F33°C | 3 mph5 km/h from NW | Clear | Clear |
| September 24 | 60°F16°C | 87°F30°C | 4 mph7 km/h from W | Clear | Mostly Clear |
| September 25 | 54°F12°C | 74°F23°C | 6 mph9 km/h from W | Mostly Clear | Partly Cloudy |
| September 26 | 55°F13°C | 74°F23°C | 5 mph9 km/h from W | Partly Cloudy | Partly Cloudy |
| September 27 | 53°F12°C | 79°F26°C | 4 mph7 km/h from W | Mostly Clear | Mostly Clear |
Yes
Low of 52°F11°C, High of 82°F28°CWind: 4 mph7 km/h
Precipitation: None