No

you don't need a jacket based on the weather in San Mateo, CA, USA 1 second ago

66°F19°C & Mostly Cloudy

Wind is 11 mph17 km/h from the West, gusting to 19 mph30 km/h
July 21
6pm66°F19°C11 mph18 km/h WestPartly Cloudy
7pm66°F19°C11 mph18 km/h WestPartly Cloudy
8pm65°F18°C11 mph17 km/h WestPartly Cloudy
9pm64°F18°C10 mph16 km/h WestMostly Cloudy
10pm62°F17°C9 mph14 km/h WestMostly Cloudy
11pm60°F16°C8 mph13 km/h WestCloudy
July 22
12am59°F15°C7 mph12 km/h WestCloudy
1am58°F15°C7 mph11 km/h WestCloudy
2am58°F14°C6 mph10 km/h WestCloudy
3am57°F14°C6 mph10 km/h WestCloudy
4am57°F14°C6 mph10 km/h WestCloudy
5am56°F13°C6 mph10 km/h SouthwestCloudy
DateLowHighWindDayNight
July 2157°F14°C66°F19°C9 mph14 km/h from WestMostly CloudyCloudy
July 2255°F13°C64°F18°C7 mph11 km/h from WestCloudyCloudy
July 2355°F13°C66°F19°C7 mph11 km/h from WestMostly CloudyMostly Cloudy
July 2456°F13°C67°F19°C7 mph11 km/h from WestPartly CloudyMostly Cloudy
July 2556°F13°C66°F19°C7 mph12 km/h from WestPartly CloudyMostly Cloudy
July 2656°F13°C65°F18°C8 mph12 km/h from WestMostly CloudyCloudy
July 2756°F13°C66°F19°C7 mph11 km/h from WestMostly CloudyMostly Cloudy

Yes

Low of 55°F13°C, High of 64°F18°C
Wind: 7 mph11 km/h
Precipitation: 4% rain

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