Yes

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

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
59°F15°C & Mostly Clear

Wind is 1 mph2 km/h from the Northeast, gusting to 3 mph5 km/h
November 2
6pm61°F16°C2 mph3 km/h NortheastMostly Clear
7pm64°F18°C2 mph3 km/h NorthClear
8pm67°F20°C3 mph4 km/h NorthwestClear
9pm70°F21°C3 mph5 km/h NorthwestClear
10pm70°F21°C6 mph9 km/h WestClear
11pm69°F20°C7 mph12 km/h WestClear
November 3
12am66°F19°C7 mph12 km/h WestClear
1am63°F17°C7 mph12 km/h WestClear
2am61°F16°C6 mph10 km/h WestClear
3am59°F15°C4 mph7 km/h SouthwestMostly Clear
4am58°F14°C4 mph6 km/h SouthwestMostly Clear
5am57°F14°C4 mph7 km/h SouthwestMostly Clear
DateLowHighWindDayNight
November 254°F12°C70°F21°C4 mph7 km/h from WestMostly ClearPartly Cloudy
November 354°F12°C64°F18°C6 mph10 km/h from WestMostly ClearPartly Cloudy
November 454°F12°C67°F19°C6 mph9 km/h from SouthMostly CloudyRain
November 557°F14°C64°F18°C15 mph24 km/h from SouthRainMostly Cloudy
November 656°F13°C67°F19°C4 mph6 km/h from WestPartly CloudyMostly Cloudy
November 755°F13°C67°F19°C4 mph7 km/h from WestPartly CloudyPartly Cloudy
November 856°F13°C70°F21°C4 mph6 km/h from NorthPartly CloudyMostly Cloudy

Yes

Low of 54°F12°C, High of 64°F18°C
Wind: 6 mph10 km/h
Precipitation: None

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