Yes

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

Why? Because it's not very warm out.
56°F14°C & Cloudy

Wind is 9 mph15 km/h from the W, gusting to 17 mph27 km/h
March 28
8pm56°F13°C9 mph15 km/h WCloudy
9pm55°F13°C8 mph13 km/h WCloudy
10pm53°F12°C6 mph9 km/h WCloudy
11pm50°F10°C3 mph5 km/h SWCloudy
March 29
12am49°F9°C2 mph4 km/h SWCloudy
1am48°F9°C2 mph3 km/h SWCloudy
2am47°F8°C1 mph2 km/h SCloudy
3am46°F8°C2 mph3 km/h SECloudy
4am46°F8°C2 mph3 km/h SECloudy
5am45°F7°C2 mph4 km/h ECloudy
6am45°F7°C3 mph4 km/h SECloudy
7am45°F7°C3 mph5 km/h SECloudy
DateLowHighWindDayNight
March 2844°F7°C58°F15°C5 mph7 km/h from SWPartly CloudyDrizzle
March 2945°F7°C52°F11°C10 mph17 km/h from SERainDrizzle
March 3046°F8°C61°F16°C7 mph11 km/h from NEDrizzlePartly Cloudy
March 3143°F6°C64°F18°C5 mph7 km/h from WPartly CloudyClear
April 143°F6°C71°F22°C4 mph7 km/h from WClearClear
April 244°F7°C72°F22°C3 mph6 km/h from SWClearPartly Cloudy
April 348°F9°C67°F20°C3 mph6 km/h from SWMostly CloudyMostly Cloudy

Yes

Low of 45°F7°C, High of 52°F11°C
Wind: 10 mph17 km/h
Precipitation: 83% rain

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