No

you don't need a jacket based on the weather in San Ramon, CA, USA 1 second ago

70°F21°C & Clear

Wind is 11 mph18 km/h from the Southwest, gusting to 18 mph29 km/h
June 16
5pm71°F22°C12 mph19 km/h SouthwestClear
6pm72°F22°C11 mph18 km/h SouthwestClear
7pm72°F22°C11 mph18 km/h SouthwestClear
8pm71°F21°C10 mph17 km/h SouthwestClear
9pm69°F20°C10 mph16 km/h SouthwestClear
10pm66°F19°C9 mph15 km/h SouthwestClear
11pm62°F17°C8 mph13 km/h SouthwestClear
June 17
12am59°F15°C4 mph7 km/h SouthwestClear
1am57°F14°C6 mph9 km/h SouthwestClear
2am55°F13°C6 mph9 km/h SouthwestClear
3am54°F12°C5 mph9 km/h SouthwestClear
4am53°F12°C5 mph8 km/h SouthwestClear
DateLowHighWindDayNight
June 1650°F10°C72°F22°C9 mph15 km/h from SouthwestMostly ClearClear
June 1749°F10°C78°F26°C7 mph12 km/h from SouthwestClearMostly Clear
June 1852°F11°C84°F29°C6 mph10 km/h from SouthwestClearClear
June 1953°F11°C69°F21°C11 mph18 km/h from SouthwestClearPartly Cloudy
June 2051°F11°C68°F20°C12 mph19 km/h from SouthwestMostly ClearClear
June 2149°F9°C72°F22°C9 mph14 km/h from WestClearClear
June 2249°F9°C76°F25°C7 mph11 km/h from WestClearPartly Cloudy

Yes

Low of 49°F10°C, High of 78°F26°C
Wind: 7 mph12 km/h
Precipitation: None

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