Yes

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

Why? Because there's a refreshing nip in the air.
48°F9°C & Drizzle

Wind is 7 mph12 km/h from the SE, gusting to 16 mph26 km/h
March 29
11am49°F9°C8 mph13 km/h SEDrizzle
12pm49°F10°C10 mph16 km/h SEDrizzle
1pm51°F10°C12 mph20 km/h SEDrizzle
2pm51°F11°C13 mph22 km/h SEDrizzle
3pm52°F11°C14 mph23 km/h SERain
4pm52°F11°C15 mph25 km/h SERain
5pm52°F11°C17 mph27 km/h SERain
6pm53°F12°C15 mph25 km/h SERain
7pm54°F12°C13 mph20 km/h SEDrizzle
8pm55°F13°C12 mph19 km/h SRain
9pm54°F12°C11 mph18 km/h SDrizzle
10pm53°F12°C11 mph18 km/h SPartly Cloudy
DateLowHighWindDayNight
March 2947°F8°C55°F13°C13 mph20 km/h from SERainDrizzle
March 3047°F8°C59°F15°C9 mph14 km/h from NEDrizzlePartly Cloudy
March 3148°F9°C61°F16°C6 mph10 km/h from WPartly CloudyMostly Clear
April 147°F9°C66°F19°C5 mph8 km/h from NClearClear
April 249°F9°C67°F20°C4 mph7 km/h from WClearPartly Cloudy
April 351°F10°C62°F17°C8 mph13 km/h from WPartly CloudyPartly Cloudy
April 447°F8°C55°F13°C16 mph25 km/h from NWWindyPartly Cloudy

Yes

Low of 47°F9°C, High of 59°F15°C
Wind: 9 mph14 km/h
Precipitation: 53% rain

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