Yes

you do need a jacket based on the weather in San Francisco, CA 94117, USA 1 second ago

Why? Because a jacket will keep you cozy, but you won't break a seat and the wind is offering free, unsolicited face massages!
57°F14°C & Mostly Cloudy

Wind is 13 mph21 km/h from the West, gusting to 22 mph36 km/h
June 8
12am57°F14°C13 mph20 km/h WestMostly Cloudy
1am57°F14°C12 mph19 km/h WestCloudy
2am56°F13°C11 mph18 km/h WestCloudy
3am56°F13°C11 mph18 km/h WestCloudy
4am55°F13°C10 mph17 km/h WestCloudy
5am55°F13°C10 mph16 km/h WestCloudy
6am55°F13°C10 mph16 km/h WestCloudy
7am54°F12°C9 mph14 km/h WestCloudy
8am54°F12°C9 mph14 km/h WestCloudy
9am54°F12°C8 mph14 km/h WestCloudy
10am54°F12°C8 mph13 km/h WestCloudy
11am55°F13°C8 mph13 km/h WestCloudy
DateLowHighWindDayNight
June 754°F12°C62°F17°C8 mph12 km/h from WestMostly CloudyCloudy
June 854°F12°C63°F17°C10 mph16 km/h from WestMostly CloudyCloudy
June 954°F12°C63°F17°C10 mph16 km/h from WestMostly CloudyCloudy
June 1054°F12°C65°F18°C11 mph18 km/h from WestMostly CloudyMostly Cloudy
June 1153°F11°C62°F17°C12 mph20 km/h from WestPartly CloudyPartly Cloudy
June 1252°F11°C63°F17°C13 mph21 km/h from WestMostly ClearMostly Clear
June 1352°F11°C61°F16°C13 mph21 km/h from WestMostly ClearMostly Clear

Yes

Low of 54°F12°C, High of 64°F18°C
Wind: 10 mph16 km/h
Precipitation: None

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