Yes

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

Why? Because it's cool. Pleasantly cool, but cool.
54°F12°C & Cloudy

Wind is 8 mph13 km/h from the W, gusting to 15 mph24 km/h
March 28
11pm53°F12°C8 mph13 km/h WCloudy
March 29
12am53°F11°C7 mph11 km/h WMostly Cloudy
1am52°F11°C5 mph9 km/h WMostly Cloudy
2am51°F11°C5 mph8 km/h WMostly Cloudy
3am51°F11°C5 mph8 km/h SWCloudy
4am51°F10°C5 mph8 km/h SWCloudy
5am51°F10°C5 mph8 km/h SWCloudy
6am50°F10°C6 mph9 km/h SCloudy
7am50°F10°C6 mph10 km/h SCloudy
8am49°F10°C7 mph11 km/h SCloudy
9am49°F10°C7 mph12 km/h SDrizzle
10am48°F9°C9 mph15 km/h SRain
DateLowHighWindDayNight
March 2850°F10°C59°F15°C6 mph9 km/h from WPartly CloudyRain
March 2948°F9°C54°F12°C15 mph23 km/h from SERainDrizzle
March 3048°F9°C58°F15°C9 mph15 km/h from NEMostly CloudyPartly Cloudy
March 3148°F9°C59°F15°C7 mph11 km/h from WPartly CloudyMostly Clear
April 149°F9°C64°F18°C4 mph7 km/h from WClearClear
April 251°F10°C65°F18°C5 mph8 km/h from SWMostly ClearPartly Cloudy
April 351°F11°C60°F16°C8 mph13 km/h from WMostly CloudyPartly Cloudy

Yes

Low of 48°F9°C, High of 55°F13°C
Wind: 15 mph23 km/h
Precipitation: 93% rain

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