Yes

you do need a jacket based on the weather in San Francisco (South of Market), California, United States 1 second ago

Why? Because it's cool. Pleasantly cool, but cool.
52°F11°C & Mostly Cloudy

Wind is 5 mph8 km/h from the SW, gusting to 9 mph15 km/h
March 29
3am52°F11°C5 mph9 km/h SWCloudy
4am51°F11°C5 mph9 km/h SWCloudy
5am51°F11°C5 mph9 km/h SWCloudy
6am51°F10°C5 mph9 km/h SCloudy
7am50°F10°C6 mph10 km/h SCloudy
8am50°F10°C7 mph11 km/h SCloudy
9am50°F10°C8 mph13 km/h SDrizzle
10am49°F9°C9 mph15 km/h SRain
11am49°F9°C11 mph17 km/h SERain
12pm49°F9°C13 mph20 km/h SERain
1pm50°F10°C15 mph24 km/h SEDrizzle
2pm50°F10°C16 mph26 km/h SEDrizzle
DateLowHighWindDayNight
March 2851°F10°C59°F15°C6 mph9 km/h from WPartly CloudyRain
March 2949°F9°C54°F12°C15 mph25 km/h from SERainDrizzle
March 3048°F9°C58°F15°C9 mph15 km/h from NEDrizzlePartly Cloudy
March 3148°F9°C60°F15°C7 mph11 km/h from WPartly CloudyMostly Clear
April 149°F9°C65°F18°C4 mph7 km/h from WClearClear
April 251°F11°C64°F18°C6 mph9 km/h from SWMostly ClearPartly Cloudy
April 352°F11°C61°F16°C9 mph14 km/h from WMostly CloudyPartly Cloudy

Yes

Low of 49°F10°C, High of 55°F13°C
Wind: 15 mph25 km/h
Precipitation: 89% rain

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