Yes

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

Why? Because it's not very warm out.
55°F13°C & Cloudy

Wind is 12 mph19 km/h from the SW, gusting to 21 mph33 km/h
March 28
5pm55°F13°C12 mph19 km/h WCloudy
6pm55°F13°C9 mph14 km/h SWMostly Cloudy
7pm55°F13°C8 mph13 km/h SWCloudy
8pm53°F12°C10 mph15 km/h SWCloudy
9pm52°F11°C8 mph13 km/h SMostly Cloudy
10pm49°F9°C6 mph10 km/h SCloudy
11pm47°F8°C7 mph11 km/h SECloudy
March 29
12am46°F8°C7 mph11 km/h SCloudy
1am45°F7°C7 mph12 km/h SMostly Cloudy
2am45°F7°C7 mph12 km/h SMostly Cloudy
3am44°F7°C7 mph11 km/h SCloudy
4am43°F6°C6 mph10 km/h SMostly Cloudy
DateLowHighWindDayNight
March 2838°F3°C56°F13°C7 mph11 km/h from SWMostly CloudyMostly Cloudy
March 2937°F3°C57°F14°C5 mph7 km/h from NPartly CloudyPartly Cloudy
March 3034°F1°C59°F15°C4 mph7 km/h from NWClearPartly Cloudy
March 3137°F3°C60°F16°C5 mph8 km/h from NWClearMostly Clear
April 139°F4°C67°F20°C7 mph11 km/h from SWMostly ClearClear
April 246°F8°C75°F24°C6 mph10 km/h from SWClearPartly Cloudy
April 345°F7°C61°F16°C12 mph19 km/h from SWMostly CloudyMostly Cloudy

Yes

Low of 37°F3°C, High of 57°F14°C
Wind: 5 mph7 km/h
Precipitation: None

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