No

you don't need a jacket based on the weather in Atherton, CA 94027, USA 1 second ago

59°F15°C & Clear

Wind is 3 mph5 km/h from the North, gusting to 5 mph8 km/h
January 16
5pm61°F16°C5 mph8 km/h NorthClear
6pm60°F15°C5 mph8 km/h NorthClear
7pm59°F15°C5 mph7 km/h NorthwestClear
8pm55°F13°C3 mph6 km/h NorthwestClear
9pm52°F11°C3 mph6 km/h NorthwestClear
10pm49°F10°C4 mph6 km/h NorthwestClear
11pm48°F9°C2 mph4 km/h SouthwestClear
January 17
12am47°F8°C2 mph4 km/h SouthwestClear
1am46°F8°C2 mph4 km/h SouthwestClear
2am44°F7°C2 mph4 km/h SouthwestMostly Clear
3am44°F7°C2 mph4 km/h SouthwestMostly Clear
4am43°F6°C2 mph4 km/h SouthMostly Clear
DateLowHighWindDayNight
January 1636°F2°C61°F16°C3 mph5 km/h from NorthwestClearMostly Clear
January 1742°F5°C56°F13°C3 mph5 km/h from WestPartly CloudyPartly Cloudy
January 1841°F5°C57°F14°C3 mph4 km/h from NorthMostly ClearMostly Clear
January 1940°F5°C55°F13°C3 mph5 km/h from NorthwestMostly ClearPartly Cloudy
January 2041°F5°C58°F14°C5 mph9 km/h from NorthMostly ClearMostly Clear
January 2142°F6°C59°F15°C3 mph5 km/h from NorthMostly ClearMostly Clear
January 2241°F5°C61°F16°C3 mph5 km/h from NorthClearClear

Yes

Low of 42°F6°C, High of 56°F14°C
Wind: 3 mph5 km/h
Precipitation: None

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