Yes

you do need a jacket based on the weather in Walla Walla, WA 99362, USA 1 second ago

Why? Because it's cold. simple as that.
43°F6°C & Partly Cloudy

Wind is 4 mph6 km/h from the S, gusting to 6 mph10 km/h
March 28
12pm45°F7°C4 mph6 km/h SMostly Cloudy
1pm49°F9°C5 mph7 km/h SWMostly Cloudy
2pm51°F11°C7 mph11 km/h SWMostly Cloudy
3pm53°F12°C9 mph14 km/h SWMostly Cloudy
4pm55°F13°C9 mph14 km/h SWMostly Cloudy
5pm55°F13°C9 mph14 km/h SWCloudy
6pm54°F12°C10 mph16 km/h SWCloudy
7pm56°F13°C7 mph12 km/h SWMostly Cloudy
8pm54°F12°C11 mph18 km/h SWMostly Cloudy
9pm52°F11°C8 mph13 km/h SMostly Cloudy
10pm49°F10°C6 mph10 km/h SCloudy
11pm47°F9°C6 mph10 km/h SECloudy
DateLowHighWindDayNight
March 2838°F3°C56°F13°C7 mph12 km/h from SWMostly CloudyMostly Cloudy
March 2938°F3°C58°F14°C4 mph7 km/h from NPartly CloudyPartly Cloudy
March 3035°F1°C60°F16°C4 mph7 km/h from NWClearMostly Clear
March 3137°F3°C61°F16°C5 mph8 km/h from NWClearMostly Clear
April 140°F4°C70°F21°C6 mph10 km/h from SWClearMostly Clear
April 247°F8°C76°F25°C5 mph8 km/h from SWClearMostly Clear
April 347°F8°C64°F18°C10 mph16 km/h from SWDrizzlePartly Cloudy

Yes

Low of 37°F3°C, High of 57°F14°C
Wind: 4 mph7 km/h
Precipitation: None

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