Yes

you do need a jacket based on the weather in San Ramon, CA 94583, USA 13 minutes ago

Why? Because you're not freezing, but you’ll definitely start complaining if it lasts much longer!
37°F3°C & Clear

Wind is 6 mph9 km/h from the North, gusting to 10 mph16 km/h
January 20
11am38°F4°C7 mph12 km/h NorthClear
12pm43°F6°C8 mph12 km/h NorthClear
1pm49°F9°C6 mph9 km/h NortheastClear
2pm53°F12°C7 mph11 km/h NortheastClear
3pm56°F14°C8 mph13 km/h NortheastClear
4pm58°F15°C9 mph14 km/h NortheastClear
5pm60°F15°C10 mph17 km/h NortheastClear
6pm60°F16°C9 mph15 km/h NortheastClear
7pm59°F15°C7 mph11 km/h NortheastClear
8pm55°F13°C5 mph9 km/h NortheastClear
9pm50°F10°C5 mph7 km/h NortheastClear
10pm48°F9°C4 mph7 km/h NortheastClear
DateLowHighWindDayNight
January 2037°F3°C60°F16°C7 mph12 km/h from NortheastClearClear
January 2136°F2°C60°F16°C3 mph5 km/h from NorthMostly ClearMostly Clear
January 2237°F3°C64°F18°C4 mph7 km/h from NortheastClearClear
January 2341°F5°C65°F18°C4 mph7 km/h from NortheastClearPartly Cloudy
January 2443°F6°C61°F16°C3 mph5 km/h from WestMostly CloudyPartly Cloudy
January 2538°F4°C50°F10°C9 mph15 km/h from NorthwestMostly ClearMostly Clear
January 2635°F1°C51°F10°C6 mph10 km/h from NortheastClearClear

Yes

Low of 36°F2°C, High of 61°F16°C
Wind: 3 mph5 km/h
Precipitation: None

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