Yes

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

Why? Because a little drizzle out and it's cold enough that makes you wish you had a hat, but you're still too proud to admit it!
48°F9°C & Drizzle

Wind is 9 mph14 km/h from the South, gusting to 19 mph30 km/h
March 20
6pm48°F9°C9 mph14 km/h SouthDrizzle
7pm47°F9°C9 mph15 km/h SouthDrizzle
8pm47°F8°C10 mph16 km/h SouthDrizzle
9pm46°F8°C9 mph14 km/h SouthDrizzle
10pm45°F7°C7 mph11 km/h SouthDrizzle
11pm44°F7°C8 mph13 km/h SouthDrizzle
March 21
12am44°F7°C9 mph14 km/h SouthThunderstorms
1am44°F7°C10 mph15 km/h SouthCloudy
2am45°F7°C13 mph20 km/h SouthCloudy
3am46°F8°C14 mph23 km/h SouthCloudy
4am46°F8°C13 mph21 km/h SouthDrizzle
5am46°F8°C12 mph20 km/h SouthCloudy
DateLowHighWindDayNight
March 2040°F5°C48°F9°C6 mph10 km/h from SouthDrizzleDrizzle
March 2141°F5°C49°F10°C9 mph15 km/h from SouthDrizzleRain
March 2239°F4°C51°F11°C5 mph9 km/h from SouthCloudyRain
March 2342°F6°C53°F12°C8 mph12 km/h from SouthRainDrizzle
March 2450°F10°C60°F16°C5 mph8 km/h from SouthwestCloudyMostly Cloudy
March 2544°F7°C70°F21°C3 mph5 km/h from NorthwestMostly CloudyMostly Cloudy
March 2648°F9°C63°F17°C5 mph7 km/h from SouthwestRainRain

Yes

Low of 41°F5°C, High of 49°F10°C
Wind: 9 mph15 km/h
Precipitation: 76% rain

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