Yes

you do need a jacket based on the weather in Mountain View, CA 94040, USA 1 second ago

Why? Because it's not very warm out!
59°F15°C & Cloudy

Wind is 8 mph13 km/h from the South, gusting to 16 mph25 km/h
December 13
4pm59°F15°C8 mph14 km/h SouthCloudy
5pm58°F15°C9 mph14 km/h SoutheastCloudy
6pm58°F14°C9 mph15 km/h SouthCloudy
7pm57°F14°C10 mph15 km/h SouthCloudy
8pm56°F13°C10 mph16 km/h SouthCloudy
9pm55°F13°C11 mph17 km/h SouthCloudy
10pm55°F13°C12 mph19 km/h SouthCloudy
11pm55°F13°C13 mph21 km/h SouthCloudy
December 14
12am54°F12°C13 mph22 km/h SouthCloudy
1am54°F12°C15 mph25 km/h SouthWindy
2am54°F12°C16 mph25 km/h SouthRain
3am53°F12°C16 mph25 km/h SouthRain
DateLowHighWindDayNight
December 1349°F9°C59°F15°C8 mph12 km/h from SoutheastCloudyHeavy Rain
December 1445°F7°C56°F13°C12 mph19 km/h from SouthwestHeavy RainMostly Clear
December 1540°F5°C56°F13°C2 mph3 km/h from NortheastMostly ClearMostly Cloudy
December 1640°F4°C55°F13°C4 mph6 km/h from SouthDrizzleCloudy
December 1742°F6°C59°F15°C3 mph5 km/h from NorthPartly CloudyClear
December 1841°F5°C60°F16°C2 mph3 km/h from NortheastMostly ClearMostly Cloudy
December 1943°F6°C62°F17°C2 mph2 km/h from NortheastPartly CloudyPartly Cloudy

Yes

Low of 45°F7°C, High of 56°F14°C
Wind: 12 mph19 km/h
Precipitation: 90% rain

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