Yes

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

Why? Because sorry, it's too cool for just a hoodie!
56°F13°C & Mostly Cloudy

Wind is 3 mph5 km/h from the West, gusting to 7 mph12 km/h
October 31
8am55°F13°C3 mph5 km/h SouthwestPartly Cloudy
9am54°F12°C3 mph4 km/h SouthwestMostly Clear
10am53°F12°C4 mph6 km/h SouthMostly Clear
11am53°F12°C3 mph4 km/h SouthwestMostly Clear
12pm53°F12°C2 mph4 km/h SouthPartly Cloudy
1pm53°F11°C3 mph4 km/h SouthPartly Cloudy
2pm52°F11°C3 mph4 km/h SouthwestPartly Cloudy
3pm54°F12°C2 mph3 km/h SouthwestMostly Cloudy
4pm56°F13°C2 mph3 km/h SouthwestMostly Cloudy
5pm58°F15°C2 mph3 km/h WestPartly Cloudy
6pm60°F16°C2 mph2 km/h WestPartly Cloudy
7pm63°F17°C2 mph4 km/h SouthwestMostly Clear
DateLowHighWindDayNight
October 3152°F11°C67°F19°C4 mph7 km/h from WestPartly CloudyMostly Clear
November 155°F13°C68°F20°C3 mph6 km/h from WestMostly ClearPartly Cloudy
November 256°F13°C70°F21°C4 mph7 km/h from WestMostly ClearMostly Clear
November 354°F12°C64°F18°C6 mph9 km/h from SouthwestPartly CloudyMostly Cloudy
November 456°F13°C66°F19°C6 mph10 km/h from SouthMostly CloudyRain
November 555°F13°C64°F18°C17 mph28 km/h from SouthRainMostly Cloudy
November 654°F12°C64°F18°C5 mph7 km/h from WestMostly ClearPartly Cloudy

Yes

Low of 55°F13°C, High of 68°F20°C
Wind: 3 mph6 km/h
Precipitation: None

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