Yes

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

Why? Because it's cold. simple as that.
49°F10°C & Drizzle

Wind is 12 mph20 km/h from the SE, gusting to 21 mph34 km/h
March 29
12pm49°F10°C13 mph20 km/h SEDrizzle
1pm50°F10°C14 mph23 km/h SEDrizzle
2pm50°F10°C16 mph26 km/h SERain
3pm51°F10°C17 mph27 km/h SERain
4pm51°F11°C17 mph28 km/h SERain
5pm51°F11°C19 mph30 km/h SERain
6pm52°F11°C19 mph30 km/h SERain
7pm53°F11°C15 mph23 km/h SERain
8pm53°F12°C14 mph23 km/h SEDrizzle
9pm53°F12°C13 mph21 km/h SMostly Cloudy
10pm53°F11°C12 mph20 km/h SDrizzle
11pm52°F11°C12 mph19 km/h SDrizzle
DateLowHighWindDayNight
March 2949°F9°C54°F12°C15 mph24 km/h from SERainRain
March 3048°F9°C58°F15°C10 mph16 km/h from NEDrizzlePartly Cloudy
March 3148°F9°C59°F15°C7 mph12 km/h from SWPartly CloudyMostly Clear
April 149°F9°C65°F18°C5 mph9 km/h from NWClearClear
April 251°F10°C66°F19°C5 mph8 km/h from WClearPartly Cloudy
April 351°F11°C61°F16°C9 mph14 km/h from WPartly CloudyMostly Clear
April 447°F9°C55°F13°C15 mph25 km/h from NWWindyPartly Cloudy

Yes

Low of 48°F9°C, High of 58°F15°C
Wind: 10 mph16 km/h
Precipitation: 48% rain

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