Yes

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

Why? Because a jacket will keep you cozy, but you won't break a seat!
58°F14°C & Mostly Clear

Wind is 3 mph5 km/h from the West, gusting to 5 mph8 km/h
November 8
5am57°F14°C2 mph4 km/h NorthwestMostly Clear
6am56°F14°C3 mph5 km/h NorthMostly Clear
7am56°F13°C3 mph5 km/h NorthMostly Clear
8am56°F13°C3 mph4 km/h NorthwestPartly Cloudy
9am55°F13°C2 mph3 km/h NorthwestPartly Cloudy
10am55°F13°C1 mph2 km/h SouthPartly Cloudy
11am55°F13°C2 mph3 km/h SoutheastMostly Cloudy
12pm55°F13°C3 mph4 km/h NortheastMostly Cloudy
1pm54°F12°C2 mph4 km/h EastMostly Cloudy
2pm54°F12°C2 mph3 km/h NortheastMostly Cloudy
3pm54°F12°C2 mph4 km/h EastMostly Cloudy
4pm55°F13°C3 mph5 km/h EastMostly Cloudy
DateLowHighWindDayNight
November 754°F12°C66°F19°C3 mph5 km/h from WestPartly CloudyPartly Cloudy
November 854°F12°C70°F21°C3 mph6 km/h from NorthPartly CloudyPartly Cloudy
November 956°F13°C74°F23°C5 mph8 km/h from NortheastPartly CloudyMostly Cloudy
November 1056°F13°C74°F23°C4 mph6 km/h from NorthMostly CloudyMostly Cloudy
November 1156°F13°C71°F22°C3 mph6 km/h from NorthwestPartly CloudyMostly Cloudy
November 1256°F13°C65°F18°C6 mph10 km/h from SouthMostly CloudyRain
November 1356°F13°C64°F18°C9 mph14 km/h from SouthRainDrizzle

Yes

Low of 54°F12°C, High of 70°F21°C
Wind: 3 mph6 km/h
Precipitation: None

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