Yes

you do need a jacket based on the weather in Vallejo, CA 94591, USA 1 second ago

Why? Because it's cool. Pleasantly cool, but cool.
54°F12°C & Partly Cloudy

Wind is 7 mph11 km/h from the W, gusting to 12 mph20 km/h
March 28
3pm55°F13°C8 mph13 km/h WPartly Cloudy
4pm56°F14°C9 mph14 km/h WPartly Cloudy
5pm57°F14°C9 mph15 km/h WPartly Cloudy
6pm58°F14°C10 mph16 km/h WMostly Cloudy
7pm57°F14°C11 mph17 km/h WMostly Cloudy
8pm56°F13°C11 mph17 km/h WMostly Cloudy
9pm54°F12°C11 mph17 km/h WMostly Cloudy
10pm52°F11°C10 mph15 km/h WCloudy
11pm50°F10°C8 mph13 km/h WCloudy
March 29
12am50°F10°C6 mph10 km/h WCloudy
1am49°F9°C5 mph9 km/h WCloudy
2am48°F9°C5 mph8 km/h WCloudy
DateLowHighWindDayNight
March 2846°F8°C58°F14°C8 mph12 km/h from WPartly CloudyDrizzle
March 2945°F7°C51°F11°C9 mph14 km/h from SERainDrizzle
March 3045°F7°C56°F13°C8 mph14 km/h from NEDrizzlePartly Cloudy
March 3144°F6°C59°F15°C4 mph7 km/h from SPartly CloudyClear
April 144°F7°C68°F20°C3 mph5 km/h from WClearClear
April 247°F9°C70°F21°C3 mph5 km/h from SWClearMostly Clear
April 349°F9°C67°F20°C6 mph9 km/h from SWPartly CloudyPartly Cloudy

Yes

Low of 45°F7°C, High of 52°F11°C
Wind: 9 mph14 km/h
Precipitation: 77% rain

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