No
you don't need a jacket based on the weather in South San Francisco, CA, USA 1 second ago
64°F18°C & Cloudy
Wind is 3 mph5 km/h from the North, gusting to 4 mph7 km/h
| October 15 | ||||
| 11pm | 64°F18°C | 4 mph6 km/h North | Mostly Clear | |
| October 16 | ||||
| 12am | 64°F18°C | 4 mph6 km/h North | Mostly Clear | |
| 1am | 63°F17°C | 3 mph6 km/h North | Mostly Clear | |
| 2am | 60°F16°C | 5 mph7 km/h Northwest | Mostly Clear | |
| 3am | 59°F15°C | 5 mph8 km/h Northwest | Mostly Clear | |
| 4am | 58°F14°C | 5 mph9 km/h Northwest | Clear | |
| 5am | 57°F14°C | 6 mph9 km/h Northwest | Clear | |
| 6am | 57°F14°C | 5 mph8 km/h Northwest | Clear | |
| 7am | 57°F14°C | 5 mph8 km/h Northwest | Clear | |
| 8am | 56°F13°C | 4 mph7 km/h Northwest | Clear | |
| 9am | 55°F13°C | 4 mph7 km/h Northwest | Clear | |
| 10am | 55°F13°C | 4 mph6 km/h Northwest | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| October 15 | 54°F12°C | 64°F18°C | 3 mph5 km/h from Northeast | Mostly Cloudy | Clear |
| October 16 | 54°F12°C | 65°F18°C | 4 mph7 km/h from West | Mostly Clear | Mostly Clear |
| October 17 | 53°F12°C | 71°F22°C | 4 mph6 km/h from North | Mostly Clear | Mostly Clear |
| October 18 | 55°F13°C | 73°F23°C | 3 mph5 km/h from Northwest | Mostly Clear | Clear |
| October 19 | 56°F13°C | 68°F20°C | 7 mph11 km/h from West | Mostly Clear | Mostly Clear |
| October 20 | 54°F12°C | 70°F21°C | 6 mph9 km/h from North | Clear | Clear |
| October 21 | 55°F13°C | 69°F20°C | 5 mph7 km/h from Northeast | Clear | Mostly Clear |
Yes
Low of 54°F12°C, High of 65°F19°CWind: 4 mph7 km/h
Precipitation: 1% rain