Yes
you do need a jacket based on the weather in Altadena, CA, USA 1 second ago
Why? Because it's cool. Pleasantly cool, but cool!
57°F14°C & Clear
Wind is 2 mph4 km/h from the Northeast, gusting to 10 mph16 km/h
| January 9 | ||||
| 12am | 56°F13°C | 3 mph6 km/h Northeast | Mostly Clear | |
| 1am | 55°F13°C | 5 mph8 km/h East | Clear | |
| 2am | 54°F12°C | 5 mph9 km/h East | Mostly Clear | |
| 3am | 53°F12°C | 6 mph10 km/h East | Mostly Cloudy | |
| 4am | 53°F12°C | 6 mph9 km/h East | Clear | |
| 5am | 52°F11°C | 3 mph5 km/h Northeast | Clear | |
| 6am | 51°F11°C | 5 mph8 km/h North | Clear | |
| 7am | 52°F11°C | 5 mph9 km/h Northeast | Clear | |
| 8am | 52°F11°C | 6 mph10 km/h Northeast | Clear | |
| 9am | 52°F11°C | 6 mph10 km/h Northeast | Clear | |
| 10am | 52°F11°C | 6 mph9 km/h Northeast | Clear | |
| 11am | 55°F13°C | 6 mph9 km/h Northeast | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| January 8 | 53°F12°C | 64°F18°C | 6 mph10 km/h from North | Mostly Clear | Mostly Clear |
| January 9 | 51°F11°C | 70°F21°C | 5 mph9 km/h from Northeast | Clear | Clear |
| January 10 | 50°F10°C | 68°F20°C | 4 mph7 km/h from West | Clear | Clear |
| January 11 | 50°F10°C | 67°F19°C | 4 mph7 km/h from North | Clear | Clear |
| January 12 | 47°F8°C | 66°F19°C | 4 mph6 km/h from Southwest | Clear | Clear |
| January 13 | 45°F7°C | 62°F16°C | 6 mph10 km/h from North | Clear | Clear |
| January 14 | 45°F7°C | 63°F17°C | 6 mph10 km/h from Northeast | Clear | Mostly Clear |
Yes
Low of 52°F11°C, High of 70°F21°CWind: 5 mph9 km/h
Precipitation: None