Yes

you do need a jacket based on the weather in San Mateo, CA, USA 1 second ago

Why? Because it's quite chilly.
49°F9°C & Mostly Clear

Wind is 6 mph10 km/h from the W, gusting to 14 mph23 km/h
March 28
10am49°F9°C6 mph10 km/h WMostly Clear
11am50°F10°C5 mph8 km/h WPartly Cloudy
12pm52°F11°C4 mph7 km/h WPartly Cloudy
1pm54°F12°C5 mph8 km/h NWPartly Cloudy
2pm55°F13°C5 mph8 km/h WPartly Cloudy
3pm57°F14°C6 mph10 km/h WPartly Cloudy
4pm58°F14°C7 mph11 km/h WPartly Cloudy
5pm59°F15°C8 mph12 km/h WMostly Cloudy
6pm59°F15°C9 mph14 km/h WMostly Cloudy
7pm58°F14°C10 mph16 km/h WMostly Cloudy
8pm57°F14°C10 mph15 km/h WMostly Cloudy
9pm56°F13°C9 mph15 km/h WCloudy
DateLowHighWindDayNight
March 2849°F9°C59°F15°C7 mph11 km/h from WPartly CloudyCloudy
March 2948°F9°C54°F12°C12 mph19 km/h from SERainRain
March 3048°F9°C58°F14°C7 mph12 km/h from NEDrizzlePartly Cloudy
March 3147°F8°C62°F16°C5 mph8 km/h from WPartly CloudyMostly Clear
April 149°F9°C65°F19°C4 mph7 km/h from NWMostly ClearMostly Clear
April 250°F10°C66°F19°C4 mph7 km/h from WClearPartly Cloudy
April 350°F10°C64°F18°C5 mph9 km/h from WPartly CloudyMostly Cloudy

Yes

Low of 48°F9°C, High of 55°F13°C
Wind: 12 mph19 km/h
Precipitation: 83% rain

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