Yes

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

Why? Because it's pretty chilly!
57°F14°C & Mostly Clear

Wind is 2 mph4 km/h from the West, gusting to 4 mph7 km/h
August 9
7am57°F14°C3 mph4 km/h WestMostly Clear
8am57°F14°C3 mph5 km/h WestMostly Clear
9am57°F14°C1 mph2 km/h SouthwestMostly Clear
10am57°F14°C2 mph3 km/h SouthwestPartly Cloudy
11am59°F15°C2 mph3 km/h WestPartly Cloudy
12pm62°F17°C3 mph4 km/h SouthwestMostly Clear
1pm65°F18°C3 mph5 km/h NorthClear
2pm67°F20°C4 mph6 km/h WestClear
3pm70°F21°C5 mph8 km/h WestClear
4pm72°F22°C6 mph10 km/h WestClear
5pm73°F23°C6 mph10 km/h WestClear
6pm74°F23°C7 mph11 km/h WestClear
DateLowHighWindDayNight
August 956°F14°C74°F23°C5 mph8 km/h from WestMostly ClearPartly Cloudy
August 1056°F13°C70°F21°C6 mph9 km/h from WestMostly ClearPartly Cloudy
August 1157°F14°C69°F21°C7 mph11 km/h from WestMostly ClearPartly Cloudy
August 1256°F13°C66°F19°C7 mph12 km/h from WestPartly CloudyMostly Cloudy
August 1358°F14°C68°F20°C8 mph13 km/h from WestMostly CloudyMostly Cloudy
August 1457°F14°C67°F19°C10 mph16 km/h from WestPartly CloudyMostly Clear
August 1557°F14°C67°F20°C12 mph19 km/h from WestMostly ClearMostly Cloudy

Yes

Low of 55°F13°C, High of 71°F22°C
Wind: 6 mph9 km/h
Precipitation: None

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