Yes

you do need a jacket based on the weather in San Francisco, CA 94108, USA 59 seconds ago

Why? Because it's not very warm out!
54°F12°C & Cloudy

Wind is 7 mph12 km/h from the Southwest, gusting to 15 mph24 km/h
July 1
5am54°F12°C7 mph11 km/h SouthwestCloudy
6am54°F12°C7 mph11 km/h SouthwestCloudy
7am54°F12°C7 mph11 km/h SouthwestCloudy
8am53°F12°C7 mph12 km/h SouthwestCloudy
9am53°F12°C7 mph12 km/h SouthwestCloudy
10am53°F12°C7 mph11 km/h SouthwestCloudy
11am55°F13°C7 mph11 km/h SouthwestMostly Cloudy
12pm56°F14°C7 mph11 km/h SouthwestMostly Cloudy
1pm58°F15°C7 mph11 km/h SouthwestMostly Cloudy
2pm60°F16°C7 mph12 km/h SouthwestMostly Cloudy
3pm63°F17°C8 mph13 km/h SouthwestPartly Cloudy
4pm65°F18°C10 mph16 km/h SouthwestMostly Clear
DateLowHighWindDayNight
July 153°F12°C65°F19°C9 mph14 km/h from SouthwestPartly CloudyMostly Cloudy
July 254°F12°C64°F18°C9 mph15 km/h from SouthwestPartly CloudyPartly Cloudy
July 354°F12°C66°F19°C10 mph16 km/h from SouthwestPartly CloudyMostly Clear
July 454°F12°C64°F18°C12 mph19 km/h from WestMostly ClearMostly Clear
July 553°F12°C65°F19°C8 mph13 km/h from SouthwestMostly ClearMostly Clear
July 653°F12°C65°F18°C9 mph14 km/h from SouthwestPartly CloudyMostly Cloudy
July 754°F12°C64°F18°C9 mph14 km/h from SouthwestPartly CloudyPartly Cloudy

Yes

Low of 54°F12°C, High of 64°F18°C
Wind: 9 mph15 km/h
Precipitation: None

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