No
you don't need a jacket based on the weather in South San Francisco, CA, USA 1 second ago
70°F21°C & Cloudy
Wind is 11 mph17 km/h from the West, gusting to 16 mph26 km/h
| September 18 | ||||
| 6pm | 70°F21°C | 11 mph17 km/h West | Mostly Cloudy | |
| 7pm | 68°F20°C | 10 mph16 km/h West | Cloudy | |
| 8pm | 67°F19°C | 9 mph15 km/h West | Cloudy | |
| 9pm | 65°F18°C | 9 mph15 km/h West | Cloudy | |
| 10pm | 64°F18°C | 7 mph12 km/h West | Cloudy | |
| 11pm | 63°F17°C | 5 mph9 km/h West | Cloudy | |
| September 19 | ||||
| 12am | 63°F17°C | 7 mph11 km/h West | Cloudy | |
| 1am | 63°F17°C | 6 mph9 km/h West | Cloudy | |
| 2am | 63°F17°C | 4 mph7 km/h Southwest | Cloudy | |
| 3am | 62°F17°C | 4 mph7 km/h Southwest | Cloudy | |
| 4am | 62°F17°C | 4 mph6 km/h Southwest | Cloudy | |
| 5am | 62°F17°C | 4 mph6 km/h West | Cloudy | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 18 | 61°F16°C | 70°F21°C | 7 mph12 km/h from West | Mostly Cloudy | Cloudy |
| September 19 | 61°F16°C | 72°F22°C | 5 mph9 km/h from West | Partly Cloudy | Partly Cloudy |
| September 20 | 60°F16°C | 72°F22°C | 6 mph10 km/h from West | Mostly Clear | Partly Cloudy |
| September 21 | 59°F15°C | 71°F22°C | 7 mph12 km/h from West | Partly Cloudy | Mostly Clear |
| September 22 | 59°F15°C | 77°F25°C | 5 mph8 km/h from West | Clear | Mostly Clear |
| September 23 | 62°F17°C | 77°F25°C | 5 mph8 km/h from West | Mostly Clear | Partly Cloudy |
| September 24 | 60°F16°C | 72°F22°C | 6 mph10 km/h from West | Partly Cloudy | Partly Cloudy |
No
Low of 61°F16°C, High of 72°F22°CWind: 5 mph9 km/h
Precipitation: None