Yes

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

Why? Because it's pretty chilly.
56°F13°C & Cloudy

Wind is 4 mph7 km/h from the W, gusting to 11 mph18 km/h
April 26
8am56°F13°C5 mph9 km/h NWCloudy
9am55°F13°C7 mph11 km/h NWMostly Cloudy
10am55°F13°C7 mph11 km/h NWMostly Cloudy
11am56°F13°C8 mph12 km/h NWMostly Cloudy
12pm57°F14°C10 mph16 km/h NWMostly Cloudy
1pm59°F15°C11 mph18 km/h NWPartly Cloudy
2pm62°F16°C12 mph20 km/h NWPartly Cloudy
3pm64°F18°C13 mph22 km/h NWPartly Cloudy
4pm65°F19°C14 mph23 km/h NWPartly Cloudy
5pm66°F19°C15 mph24 km/h NWPartly Cloudy
6pm65°F18°C15 mph25 km/h NWWindy
7pm64°F18°C16 mph25 km/h NWWindy
DateLowHighWindDayNight
April 2654°F12°C66°F19°C13 mph21 km/h from NWPartly CloudyPartly Cloudy
April 2750°F10°C70°F21°C7 mph11 km/h from NWMostly ClearMostly Clear
April 2851°F10°C71°F22°C8 mph13 km/h from NWMostly ClearMostly Clear
April 2950°F10°C70°F21°C7 mph11 km/h from NWClearClear
April 3048°F9°C73°F23°C6 mph10 km/h from NWMostly ClearClear
May 149°F9°C75°F24°C7 mph11 km/h from NWClearMostly Clear
May 251°F10°C70°F21°C7 mph11 km/h from NWMostly ClearMostly Clear

Yes

Low of 50°F10°C, High of 70°F21°C
Wind: 7 mph11 km/h
Precipitation: None

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