No
you don't need a jacket based on the weather in San Mateo, CA, USA 1 second ago
81°F27°C & Mostly Clear
Wind is 5 mph8 km/h from the West, gusting to 8 mph13 km/h
| September 15 | ||||
| 8pm | 80°F27°C | 5 mph8 km/h West | Clear | |
| 9pm | 77°F25°C | 5 mph8 km/h West | Clear | |
| 10pm | 74°F23°C | 4 mph7 km/h West | Clear | |
| 11pm | 70°F21°C | 3 mph5 km/h West | Clear | |
| September 16 | ||||
| 12am | 67°F19°C | 2 mph3 km/h West | Clear | |
| 1am | 65°F19°C | 2 mph3 km/h Southwest | Clear | |
| 2am | 63°F17°C | 2 mph4 km/h Southwest | Clear | |
| 3am | 63°F17°C | 2 mph4 km/h Southwest | Clear | |
| 4am | 62°F17°C | 2 mph3 km/h Southwest | Clear | |
| 5am | 61°F16°C | 2 mph4 km/h Southwest | Clear | |
| 6am | 60°F16°C | 2 mph3 km/h Southwest | Clear | |
| 7am | 60°F15°C | 2 mph3 km/h Southwest | Mostly Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 15 | 58°F14°C | 82°F28°C | 3 mph5 km/h from Northwest | Mostly Clear | Clear |
| September 16 | 58°F15°C | 77°F25°C | 4 mph7 km/h from West | Clear | Mostly Clear |
| September 17 | 58°F14°C | 76°F24°C | 5 mph8 km/h from West | Mostly Clear | Mostly Cloudy |
| September 18 | 60°F16°C | 70°F21°C | 5 mph9 km/h from West | Mostly Cloudy | Cloudy |
| September 19 | 61°F16°C | 71°F22°C | 5 mph8 km/h from Southwest | Partly Cloudy | Partly Cloudy |
| September 20 | 60°F16°C | 73°F23°C | 5 mph8 km/h from West | Mostly Clear | Mostly Clear |
| September 21 | 59°F15°C | 72°F22°C | 5 mph7 km/h from West | Mostly Clear | Mostly Clear |
Yes
Low of 58°F15°C, High of 77°F25°CWind: 4 mph7 km/h
Precipitation: None