No

you don't need a jacket based on the weather in San Francisco, CA, USA 24 minutes ago

67°F20°C & Clear

Wind is 10 mph16 km/h from the Southwest, gusting to 18 mph29 km/h
May 31
11pm65°F18°C10 mph16 km/h SouthwestMostly Clear
June 1
12am63°F17°C7 mph11 km/h SouthwestPartly Cloudy
1am62°F17°C6 mph10 km/h SouthwestMostly Cloudy
2am61°F16°C6 mph10 km/h SouthwestMostly Cloudy
3am59°F15°C6 mph10 km/h SouthwestMostly Cloudy
4am58°F15°C6 mph10 km/h SouthwestMostly Cloudy
5am57°F14°C7 mph11 km/h SouthwestMostly Cloudy
6am56°F13°C7 mph11 km/h SouthwestMostly Cloudy
7am56°F13°C7 mph11 km/h SouthwestMostly Cloudy
8am55°F13°C7 mph11 km/h SouthwestMostly Cloudy
9am55°F13°C7 mph11 km/h SouthwestMostly Cloudy
10am56°F13°C7 mph12 km/h SouthwestMostly Cloudy
DateLowHighWindDayNight
May 3154°F12°C72°F22°C6 mph10 km/h from WestClearPartly Cloudy
June 155°F13°C63°F17°C12 mph19 km/h from SouthwestMostly ClearMostly Clear
June 254°F12°C66°F19°C9 mph15 km/h from SouthwestMostly ClearMostly Clear
June 355°F13°C68°F20°C9 mph14 km/h from SouthwestMostly ClearPartly Cloudy
June 455°F13°C67°F20°C9 mph14 km/h from WestMostly ClearPartly Cloudy
June 555°F13°C68°F20°C9 mph14 km/h from SouthwestMostly ClearMostly Clear
June 655°F13°C67°F20°C9 mph15 km/h from SouthwestMostly ClearPartly Cloudy

Yes

Low of 55°F13°C, High of 63°F17°C
Wind: 12 mph19 km/h
Precipitation: None

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