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!
55°F13°C & Mostly Cloudy

Wind is 5 mph8 km/h from the Southwest, gusting to 9 mph15 km/h
July 10
8am55°F13°C5 mph8 km/h SouthwestMostly Cloudy
9am55°F13°C5 mph8 km/h SouthwestMostly Cloudy
10am55°F13°C4 mph7 km/h SouthwestMostly Cloudy
11am57°F14°C4 mph7 km/h SouthPartly Cloudy
12pm61°F16°C3 mph6 km/h SouthwestMostly Clear
1pm64°F18°C3 mph6 km/h SouthwestMostly Clear
2pm66°F19°C5 mph9 km/h SouthwestMostly Clear
3pm67°F20°C7 mph12 km/h SouthwestMostly Clear
4pm68°F20°C9 mph14 km/h SouthwestMostly Clear
5pm68°F20°C10 mph16 km/h WestMostly Clear
6pm67°F20°C11 mph18 km/h WestMostly Clear
7pm67°F19°C12 mph19 km/h WestMostly Clear
DateLowHighWindDayNight
July 1054°F12°C68°F20°C8 mph13 km/h from SouthwestMostly ClearPartly Cloudy
July 1155°F13°C67°F19°C8 mph12 km/h from SouthwestMostly ClearPartly Cloudy
July 1254°F12°C65°F19°C9 mph15 km/h from SouthwestPartly CloudyPartly Cloudy
July 1355°F13°C63°F17°C9 mph14 km/h from SouthwestPartly CloudyMostly Cloudy
July 1454°F12°C64°F18°C9 mph14 km/h from SouthwestPartly CloudyMostly Cloudy
July 1554°F12°C64°F18°C10 mph17 km/h from SouthwestPartly CloudyMostly Cloudy
July 1656°F13°C64°F18°C10 mph16 km/h from SouthwestPartly CloudyPartly Cloudy

Yes

Low of 55°F13°C, High of 67°F20°C
Wind: 8 mph12 km/h
Precipitation: None

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