Yes
you do need a jacket based on the weather in Castro Valley, CA 94552, USA 1 second ago
Why? Because it's quite chilly!
47°F9°C & Cloudy
Wind is 1 mph2 km/h from the North, gusting to 3 mph5 km/h
| January 4 | ||||
| 11pm | 47°F8°C | 2 mph3 km/h Northeast | Cloudy | |
| January 5 | ||||
| 12am | 47°F8°C | 2 mph3 km/h West | Cloudy | |
| 1am | 46°F8°C | 2 mph3 km/h Northwest | Cloudy | |
| 2am | 45°F7°C | 2 mph3 km/h Southwest | Mostly Cloudy | |
| 3am | 45°F7°C | 1 mph2 km/h Northwest | Mostly Cloudy | |
| 4am | 44°F7°C | 1 mph2 km/h East | Mostly Cloudy | |
| 5am | 44°F6°C | 2 mph3 km/h East | Mostly Cloudy | |
| 6am | 43°F6°C | 2 mph3 km/h Southeast | Mostly Cloudy | |
| 7am | 42°F6°C | 2 mph3 km/h East | Mostly Cloudy | |
| 8am | 42°F6°C | 2 mph3 km/h Northeast | Partly Cloudy | |
| 9am | 42°F5°C | 2 mph3 km/h Northeast | Partly Cloudy | |
| 10am | 41°F5°C | 2 mph3 km/h East | Partly Cloudy | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| January 4 | 42°F6°C | 55°F13°C | 2 mph4 km/h from Northwest | Mostly Cloudy | Mostly Cloudy |
| January 5 | 41°F5°C | 60°F16°C | 2 mph4 km/h from Northwest | Mostly Clear | Mostly Clear |
| January 6 | 43°F6°C | 60°F16°C | 3 mph4 km/h from Northwest | Partly Cloudy | Partly Cloudy |
| January 7 | 44°F6°C | 61°F16°C | 12 mph20 km/h from North | Mostly Clear | Mostly Cloudy |
| January 8 | 45°F7°C | 62°F17°C | 3 mph5 km/h from Northeast | Mostly Clear | Clear |
| January 9 | 38°F4°C | 62°F16°C | 3 mph4 km/h from Northeast | Clear | Mostly Clear |
| January 10 | 42°F6°C | 61°F16°C | 2 mph3 km/h from Northwest | Mostly Clear | Mostly Clear |
Yes
Low of 41°F5°C, High of 60°F16°CWind: 2 mph4 km/h
Precipitation: None