No
you don't need a jacket based on the weather in San Mateo, CA, USA 1 second ago
62°F17°C & Clear
Wind is 2 mph4 km/h from the West, gusting to 5 mph8 km/h
| September 1 | ||||
| 5am | 61°F16°C | 3 mph4 km/h Southwest | Clear | |
| 6am | 61°F16°C | 2 mph4 km/h Southwest | Clear | |
| 7am | 60°F15°C | 3 mph5 km/h Southwest | Mostly Clear | |
| 8am | 59°F15°C | 2 mph3 km/h Southwest | Mostly Clear | |
| 9am | 58°F15°C | 2 mph3 km/h West | Mostly Clear | |
| 10am | 58°F14°C | 2 mph3 km/h West | Mostly Clear | |
| 11am | 60°F16°C | 2 mph3 km/h West | Partly Cloudy | |
| 12pm | 64°F18°C | 2 mph3 km/h West | Mostly Clear | |
| 1pm | 67°F19°C | 3 mph5 km/h Northwest | Mostly Clear | |
| 2pm | 69°F21°C | 4 mph7 km/h Northwest | Mostly Clear | |
| 3pm | 73°F23°C | 5 mph9 km/h Northwest | Clear | |
| 4pm | 75°F24°C | 7 mph11 km/h Northwest | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 1 | 58°F14°C | 76°F24°C | 6 mph9 km/h from West | Mostly Clear | Mostly Clear |
| September 2 | 57°F14°C | 72°F22°C | 6 mph10 km/h from West | Mostly Clear | Mostly Cloudy |
| September 3 | 58°F14°C | 71°F21°C | 6 mph9 km/h from West | Partly Cloudy | Mostly Cloudy |
| September 4 | 57°F14°C | 67°F20°C | 6 mph10 km/h from West | Mostly Cloudy | Cloudy |
| September 5 | 59°F15°C | 68°F20°C | 7 mph11 km/h from West | Mostly Cloudy | Mostly Cloudy |
| September 6 | 58°F15°C | 70°F21°C | 6 mph10 km/h from West | Partly Cloudy | Mostly Cloudy |
| September 7 | 59°F15°C | 71°F22°C | 6 mph9 km/h from West | Partly Cloudy | Mostly Cloudy |
Yes
Low of 57°F14°C, High of 73°F23°CWind: 6 mph10 km/h
Precipitation: None