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!
58°F14°C & Cloudy

Wind is 7 mph12 km/h from the Northeast, gusting to 13 mph21 km/h
November 29
7pm58°F14°C8 mph12 km/h NortheastMostly Cloudy
8pm56°F13°C7 mph11 km/h NortheastMostly Cloudy
9pm54°F12°C6 mph10 km/h NortheastPartly Cloudy
10pm52°F11°C5 mph9 km/h NortheastPartly Cloudy
11pm51°F10°C5 mph9 km/h NortheastPartly Cloudy
November 30
12am50°F10°C5 mph9 km/h NortheastPartly Cloudy
1am48°F9°C5 mph8 km/h NortheastPartly Cloudy
2am48°F9°C5 mph8 km/h NortheastMostly Cloudy
3am47°F8°C5 mph9 km/h NortheastMostly Cloudy
4am46°F8°C6 mph10 km/h NortheastPartly Cloudy
5am46°F8°C6 mph10 km/h NortheastPartly Cloudy
6am45°F7°C6 mph10 km/h NortheastMostly Cloudy
DateLowHighWindDayNight
November 2946°F8°C59°F15°C5 mph8 km/h from NortheastPartly CloudyPartly Cloudy
November 3044°F7°C61°F16°C7 mph11 km/h from NortheastMostly ClearMostly Cloudy
December 147°F8°C61°F16°C6 mph10 km/h from NortheastPartly CloudyMostly Clear
December 247°F8°C63°F17°C4 mph7 km/h from NorthMostly ClearMostly Clear
December 346°F8°C64°F18°C4 mph7 km/h from NorthClearClear
December 447°F8°C63°F17°C4 mph7 km/h from NorthClearMostly Clear
December 549°F10°C62°F17°C4 mph6 km/h from NorthPartly CloudyMostly Clear

Yes

Low of 45°F7°C, High of 61°F16°C
Wind: 7 mph11 km/h
Precipitation: None

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