No
you don't need a jacket based on the weather in Altadena, CA 91001, USA 1 second ago
71°F22°C & Cloudy
Wind is 1 mph2 km/h from the Northeast, gusting to 4 mph7 km/h
| September 18 | ||||
| 12am | 71°F21°C | 2 mph2 km/h Northeast | Cloudy | |
| 1am | 71°F21°C | 2 mph3 km/h Southwest | Cloudy | |
| 2am | 69°F21°C | 1 mph2 km/h North | Cloudy | |
| 3am | 69°F21°C | 2 mph3 km/h Northwest | Cloudy | |
| 4am | 70°F21°C | 3 mph4 km/h Northwest | Cloudy | |
| 5am | 68°F20°C | 7 mph11 km/h Northwest | Rain | |
| 6am | 66°F19°C | 9 mph14 km/h Northwest | Rain | |
| 7am | 65°F19°C | 5 mph8 km/h North | Thunderstorms | |
| 8am | 65°F18°C | 8 mph13 km/h Northeast | Thunderstorms | |
| 9am | 65°F19°C | 7 mph11 km/h East | Rain | |
| 10am | 66°F19°C | 5 mph8 km/h East | Rain | |
| 11am | 66°F19°C | 5 mph8 km/h Southeast | Rain | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 17 | 69°F21°C | 86°F30°C | 4 mph7 km/h from South | Mostly Cloudy | Thunderstorms |
| September 18 | 65°F18°C | 74°F23°C | 5 mph9 km/h from South | Rain | Drizzle |
| September 19 | 63°F17°C | 75°F24°C | 5 mph8 km/h from South | Mostly Clear | Clear |
| September 20 | 62°F17°C | 79°F26°C | 4 mph7 km/h from Southwest | Clear | Clear |
| September 21 | 65°F18°C | 79°F26°C | 4 mph6 km/h from Southwest | Mostly Clear | Mostly Clear |
| September 22 | 67°F20°C | 84°F29°C | 4 mph7 km/h from South | Mostly Clear | Mostly Clear |
| September 23 | 69°F21°C | 81°F27°C | 5 mph8 km/h from South | Mostly Clear | Clear |
No
Low of 65°F19°C, High of 74°F24°CWind: 5 mph9 km/h
Precipitation: 62% rain