Yes

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

Why? Because you're not freezing, but you’ll definitely start complaining if it lasts much longer and the wind is harsh and biting!
45°F7°C & Mostly Clear

Wind is 12 mph20 km/h from the Northwest, gusting to 22 mph35 km/h
October 20
6am45°F7°C14 mph22 km/h NorthwestMostly Clear
7am45°F7°C10 mph17 km/h NorthwestMostly Clear
8am44°F7°C12 mph19 km/h NorthwestClear
9am44°F7°C12 mph20 km/h NorthwestMostly Clear
10am44°F6°C11 mph18 km/h NorthwestPartly Cloudy
11am42°F6°C5 mph8 km/h NorthwestPartly Cloudy
12pm42°F5°C6 mph10 km/h WestPartly Cloudy
1pm41°F5°C5 mph8 km/h WestPartly Cloudy
2pm40°F4°C5 mph8 km/h WestMostly Clear
3pm40°F5°C5 mph8 km/h WestMostly Clear
4pm44°F7°C5 mph8 km/h WestPartly Cloudy
5pm48°F9°C6 mph10 km/h NorthwestPartly Cloudy
DateLowHighWindDayNight
October 1941°F5°C58°F14°C6 mph9 km/h from NorthwestDrizzleMostly Clear
October 2040°F4°C58°F15°C6 mph9 km/h from NorthwestPartly CloudyPartly Cloudy
October 2137°F3°C61°F16°C3 mph4 km/h from EastPartly CloudyMostly Clear
October 2237°F3°C62°F17°C4 mph6 km/h from WestPartly CloudyMostly Cloudy
October 2342°F5°C58°F14°C3 mph4 km/h from EastCloudyCloudy
October 2441°F5°C57°F14°C5 mph9 km/h from SouthCloudyPartly Cloudy
October 2537°F3°C51°F11°C5 mph9 km/h from WestPartly CloudyDrizzle

Yes

Low of 40°F5°C, High of 58°F15°C
Wind: 6 mph9 km/h
Precipitation: None

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