Yes

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

Why? Because it's not very warm out.
51°F10°C & Cloudy

Wind is 6 mph10 km/h from the S, gusting to 19 mph31 km/h
March 28
7pm51°F11°C7 mph12 km/h SCloudy
8pm51°F11°C7 mph11 km/h SDrizzle
9pm50°F10°C7 mph11 km/h SMostly Cloudy
10pm48°F9°C6 mph9 km/h SMostly Cloudy
11pm47°F8°C6 mph9 km/h SMostly Cloudy
March 29
12am45°F7°C5 mph8 km/h SMostly Cloudy
1am44°F7°C5 mph8 km/h SEMostly Cloudy
2am44°F6°C5 mph8 km/h SPartly Cloudy
3am43°F6°C4 mph7 km/h SEMostly Cloudy
4am43°F6°C4 mph7 km/h SEMostly Cloudy
5am42°F6°C4 mph7 km/h SEMostly Cloudy
6am42°F6°C4 mph6 km/h SEDrizzle
DateLowHighWindDayNight
March 2839°F4°C51°F11°C4 mph7 km/h from SDrizzleDrizzle
March 2940°F5°C57°F14°C4 mph7 km/h from NPartly CloudyMostly Clear
March 3037°F3°C59°F15°C4 mph6 km/h from NWPartly CloudyMostly Clear
March 3136°F2°C60°F16°C4 mph7 km/h from NWMostly ClearMostly Clear
April 140°F4°C63°F17°C3 mph5 km/h from SWPartly CloudyPartly Cloudy
April 245°F7°C64°F18°C5 mph8 km/h from SWPartly CloudyRain
April 339°F4°C48°F9°C4 mph6 km/h from SWDrizzleDrizzle

Yes

Low of 40°F5°C, High of 57°F14°C
Wind: 4 mph7 km/h
Precipitation: None

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