Yes

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

Why? Because it's pretty chilly!
55°F13°C & Mostly Cloudy

Wind is 2 mph3 km/h from the South, gusting to 4 mph6 km/h
November 4
12pm55°F13°C3 mph4 km/h SouthMostly Cloudy
1pm55°F13°C2 mph4 km/h SouthMostly Cloudy
2pm54°F12°C4 mph6 km/h SoutheastMostly Cloudy
3pm54°F12°C4 mph6 km/h SoutheastMostly Cloudy
4pm56°F13°C3 mph5 km/h SoutheastMostly Cloudy
5pm58°F15°C2 mph4 km/h SoutheastMostly Cloudy
6pm61°F16°C3 mph5 km/h SouthMostly Cloudy
7pm63°F17°C5 mph7 km/h SouthMostly Cloudy
8pm65°F18°C6 mph10 km/h SouthwestMostly Cloudy
9pm65°F18°C8 mph12 km/h SouthwestMostly Cloudy
10pm65°F18°C8 mph14 km/h SouthwestMostly Cloudy
11pm65°F18°C9 mph15 km/h SouthwestCloudy
DateLowHighWindDayNight
November 454°F12°C65°F18°C6 mph10 km/h from SouthMostly CloudyRain
November 557°F14°C64°F18°C15 mph24 km/h from SouthRainMostly Cloudy
November 655°F13°C65°F18°C4 mph6 km/h from SouthwestPartly CloudyCloudy
November 756°F13°C64°F18°C4 mph7 km/h from SouthwestMostly CloudyPartly Cloudy
November 856°F13°C68°F20°C4 mph6 km/h from NorthPartly CloudyPartly Cloudy
November 955°F13°C66°F19°C4 mph7 km/h from NorthMostly CloudyMostly Cloudy
November 1056°F13°C65°F19°C3 mph5 km/h from NorthwestMostly CloudyCloudy

Yes

Low of 57°F14°C, High of 64°F18°C
Wind: 15 mph24 km/h
Precipitation: 89% rain

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