Yes

you do need a jacket based on the weather in San Francisco (Parkside), California, United States 1 second ago

Why? Because it's cool. Pleasantly cool, but cool and it's so windy, you’re practically horizontal just trying to walk!
55°F13°C & Windy

Wind is 15 mph24 km/h from the Northwest, gusting to 27 mph43 km/h
October 13
12pm55°F13°C14 mph23 km/h NorthwestPartly Cloudy
1pm55°F13°C14 mph22 km/h NorthwestMostly Cloudy
2pm55°F13°C13 mph20 km/h NorthwestPartly Cloudy
3pm56°F13°C11 mph17 km/h WestPartly Cloudy
4pm57°F14°C9 mph15 km/h WestPartly Cloudy
5pm58°F15°C9 mph14 km/h WestMostly Cloudy
6pm59°F15°C10 mph17 km/h SouthwestDrizzle
7pm60°F15°C12 mph19 km/h SouthwestRain
8pm59°F15°C14 mph22 km/h SouthwestRain
9pm59°F15°C14 mph23 km/h SouthwestRain
10pm59°F15°C14 mph23 km/h SouthwestRain
11pm58°F15°C16 mph25 km/h SouthwestRain
DateLowHighWindDayNight
October 1352°F11°C60°F15°C12 mph19 km/h from SouthwestRainRain
October 1450°F10°C61°F16°C4 mph7 km/h from SouthwestDrizzlePartly Cloudy
October 1552°F11°C65°F18°C5 mph8 km/h from WestMostly ClearClear
October 1654°F12°C64°F18°C5 mph8 km/h from WestMostly ClearMostly Clear
October 1754°F12°C70°F21°C5 mph7 km/h from NorthMostly ClearMostly Clear
October 1856°F13°C73°F23°C4 mph7 km/h from NorthClearMostly Clear
October 1954°F12°C64°F18°C10 mph16 km/h from WestPartly CloudyClear

Yes

Low of 50°F10°C, High of 61°F16°C
Wind: 4 mph7 km/h
Precipitation: 43% rain

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