Yes
you do need a jacket based on the weather in San Mateo, CA, USA 1 second ago
Why? Because it's cool. Pleasantly cool, but cool!
56°F14°C & Partly Cloudy
Wind is 2 mph3 km/h from the West, gusting to 9 mph14 km/h
| August 12 | ||||
| 6am | 56°F13°C | 2 mph4 km/h West | Partly Cloudy | |
| 7am | 56°F13°C | 4 mph6 km/h Southwest | Mostly Cloudy | |
| 8am | 56°F14°C | 4 mph6 km/h Southwest | Cloudy | |
| 9am | 57°F14°C | 3 mph6 km/h Southwest | Cloudy | |
| 10am | 57°F14°C | 3 mph5 km/h Southwest | Cloudy | |
| 11am | 59°F15°C | 3 mph4 km/h West | Cloudy | |
| 12pm | 61°F16°C | 3 mph4 km/h West | Mostly Cloudy | |
| 1pm | 61°F16°C | 4 mph7 km/h West | Mostly Cloudy | |
| 2pm | 64°F18°C | 4 mph7 km/h West | Partly Cloudy | |
| 3pm | 66°F19°C | 5 mph8 km/h West | Mostly Clear | |
| 4pm | 68°F20°C | 7 mph12 km/h West | Mostly Clear | |
| 5pm | 69°F20°C | 8 mph13 km/h West | Mostly Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| August 12 | 56°F13°C | 69°F21°C | 6 mph10 km/h from West | Partly Cloudy | Mostly Cloudy |
| August 13 | 56°F13°C | 68°F20°C | 7 mph11 km/h from West | Partly Cloudy | Mostly Cloudy |
| August 14 | 56°F13°C | 67°F19°C | 6 mph10 km/h from West | Partly Cloudy | Mostly Clear |
| August 15 | 55°F13°C | 70°F21°C | 7 mph12 km/h from West | Mostly Clear | Mostly Cloudy |
| August 16 | 60°F15°C | 69°F21°C | 9 mph14 km/h from West | Mostly Cloudy | Cloudy |
| August 17 | 60°F16°C | 70°F21°C | 7 mph11 km/h from West | Partly Cloudy | Partly Cloudy |
| August 18 | 59°F15°C | 70°F21°C | 7 mph12 km/h from West | Mostly Clear | Partly Cloudy |
Yes
Low of 55°F13°C, High of 67°F20°CWind: 7 mph11 km/h
Precipitation: None