Yes

you do need a jacket based on the weather in San Francisco International Airport (SFO), San Francisco, CA 94128, USA 1 second ago

Why? Because it's pretty chilly.
54°F12°C & Partly Cloudy

Wind is 6 mph9 km/h from the W, gusting to 11 mph17 km/h
March 28
2pm55°F13°C6 mph10 km/h WPartly Cloudy
3pm57°F14°C7 mph11 km/h WPartly Cloudy
4pm58°F14°C8 mph12 km/h WMostly Cloudy
5pm58°F15°C8 mph13 km/h WMostly Cloudy
6pm58°F14°C10 mph16 km/h WMostly Cloudy
7pm57°F14°C10 mph16 km/h WMostly Cloudy
8pm56°F14°C10 mph16 km/h WMostly Cloudy
9pm55°F13°C10 mph15 km/h WCloudy
10pm54°F12°C9 mph14 km/h WCloudy
11pm53°F12°C7 mph11 km/h WCloudy
March 29
12am52°F11°C5 mph9 km/h WCloudy
1am52°F11°C4 mph7 km/h WCloudy
DateLowHighWindDayNight
March 2849°F10°C58°F15°C8 mph12 km/h from WPartly CloudyDrizzle
March 2948°F9°C54°F12°C13 mph21 km/h from SERainRain
March 3048°F9°C57°F14°C8 mph13 km/h from NEDrizzlePartly Cloudy
March 3147°F9°C60°F15°C5 mph9 km/h from WPartly CloudyMostly Clear
April 149°F9°C65°F18°C4 mph7 km/h from WClearMostly Clear
April 250°F10°C66°F19°C5 mph8 km/h from WMostly ClearPartly Cloudy
April 350°F10°C62°F17°C7 mph11 km/h from WPartly CloudyPartly Cloudy

Yes

Low of 48°F9°C, High of 54°F12°C
Wind: 13 mph21 km/h
Precipitation: 79% rain

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