Yes

you do need a jacket based on the weather in San Jose, CA 95124, USA 1 second ago

Why? Because it's cool. Pleasantly cool, but cool.
57°F14°C & Partly Cloudy

Wind is 3 mph5 km/h from the NW, gusting to 8 mph13 km/h
March 28
3pm58°F14°C4 mph7 km/h NWPartly Cloudy
4pm59°F15°C5 mph8 km/h NWCloudy
5pm61°F16°C6 mph9 km/h NWCloudy
6pm61°F16°C7 mph11 km/h NWCloudy
7pm60°F16°C6 mph10 km/h NWCloudy
8pm60°F15°C6 mph10 km/h NWCloudy
9pm58°F15°C6 mph10 km/h NWCloudy
10pm56°F13°C5 mph8 km/h NWCloudy
11pm53°F12°C4 mph6 km/h NWCloudy
March 29
12am52°F11°C3 mph5 km/h NWCloudy
1am51°F10°C2 mph3 km/h NWMostly Cloudy
2am49°F10°C1 mph2 km/h SWMostly Cloudy
DateLowHighWindDayNight
March 2846°F8°C61°F16°C4 mph7 km/h from NWMostly CloudyCloudy
March 2946°F8°C55°F13°C10 mph16 km/h from SERainDrizzle
March 3046°F8°C60°F16°C6 mph10 km/h from SEDrizzleDrizzle
March 3144°F7°C62°F17°C4 mph6 km/h from WPartly CloudyMostly Clear
April 146°F8°C70°F21°C4 mph7 km/h from NWClearClear
April 246°F8°C74°F23°C3 mph5 km/h from NWClearMostly Clear
April 348°F9°C72°F22°C4 mph6 km/h from NWMostly ClearPartly Cloudy

Yes

Low of 46°F8°C, High of 55°F13°C
Wind: 10 mph16 km/h
Precipitation: 71% rain

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