Yes

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

Why? Because it's cool. Pleasantly cool, but cool and it's on the windy side!
56°F14°C & Mostly Cloudy

Wind is 12 mph19 km/h from the West, gusting to 23 mph37 km/h
July 21
6am56°F14°C12 mph20 km/h WestMostly Cloudy
7am56°F13°C13 mph21 km/h WestMostly Cloudy
8am56°F13°C13 mph21 km/h WestMostly Cloudy
9am56°F13°C13 mph21 km/h WestCloudy
10am57°F14°C13 mph20 km/h WestCloudy
11am57°F14°C12 mph20 km/h WestCloudy
12pm58°F15°C12 mph20 km/h WestCloudy
1pm59°F15°C11 mph18 km/h WestCloudy
2pm60°F16°C12 mph19 km/h WestCloudy
3pm61°F16°C12 mph19 km/h WestCloudy
4pm62°F17°C13 mph20 km/h WestCloudy
5pm63°F17°C13 mph21 km/h WestCloudy
DateLowHighWindDayNight
July 2156°F13°C63°F17°C13 mph20 km/h from WestMostly CloudyCloudy
July 2256°F13°C63°F17°C9 mph14 km/h from WestCloudyCloudy
July 2356°F14°C64°F18°C8 mph14 km/h from WestMostly CloudyMostly Cloudy
July 2457°F14°C64°F18°C9 mph14 km/h from WestPartly CloudyMostly Cloudy
July 2556°F14°C64°F18°C9 mph15 km/h from WestMostly CloudyMostly Cloudy
July 2657°F14°C64°F18°C10 mph15 km/h from WestMostly CloudyMostly Cloudy
July 2756°F13°C65°F18°C9 mph15 km/h from WestPartly CloudyPartly Cloudy

Yes

Low of 56°F14°C, High of 63°F17°C
Wind: 9 mph14 km/h
Precipitation: None

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