Yes

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

Why? Because it's pretty chilly.
58°F14°C & Mostly Clear

Wind is 9 mph14 km/h from the NW, gusting to 21 mph33 km/h
April 26
11pm58°F14°C9 mph15 km/h NWPartly Cloudy
April 27
12am56°F13°C7 mph11 km/h NWMostly Clear
1am55°F13°C5 mph8 km/h NWPartly Cloudy
2am54°F12°C4 mph7 km/h NWPartly Cloudy
3am53°F12°C4 mph6 km/h NWPartly Cloudy
4am53°F11°C3 mph6 km/h NWPartly Cloudy
5am52°F11°C3 mph5 km/h NWPartly Cloudy
6am51°F11°C3 mph4 km/h NWPartly Cloudy
7am50°F10°C2 mph3 km/h WPartly Cloudy
8am50°F10°C2 mph3 km/h WPartly Cloudy
9am49°F9°C2 mph4 km/h SWPartly Cloudy
10am49°F10°C3 mph4 km/h SPartly Cloudy
DateLowHighWindDayNight
April 2653°F12°C66°F19°C8 mph12 km/h from NWPartly CloudyPartly Cloudy
April 2749°F9°C70°F21°C7 mph11 km/h from NWMostly ClearMostly Clear
April 2850°F10°C71°F22°C8 mph13 km/h from NWMostly ClearPartly Cloudy
April 2949°F10°C70°F21°C8 mph13 km/h from NWMostly ClearClear
April 3048°F9°C72°F22°C7 mph11 km/h from NWMostly ClearClear
May 148°F9°C75°F24°C7 mph12 km/h from NWClearMostly Clear
May 249°F9°C74°F23°C5 mph9 km/h from NWClearPartly Cloudy

Yes

Low of 49°F10°C, High of 70°F21°C
Wind: 7 mph11 km/h
Precipitation: None

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