Yes

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

Why? Because it's not very warm out!
53°F12°C & Mostly Cloudy

Wind is 4 mph6 km/h from the Northeast, gusting to 10 mph16 km/h
July 26
6am53°F12°C3 mph5 km/h NortheastMostly Cloudy
7am53°F12°C2 mph4 km/h NortheastCloudy
8am52°F11°C3 mph4 km/h EastMostly Cloudy
9am52°F11°C3 mph5 km/h EastCloudy
10am54°F12°C3 mph4 km/h EastCloudy
11am56°F13°C2 mph4 km/h EastCloudy
12pm58°F15°C2 mph3 km/h SouthCloudy
1pm60°F16°C3 mph4 km/h SouthCloudy
2pm63°F17°C3 mph5 km/h SouthwestMostly Cloudy
3pm65°F19°C4 mph6 km/h SouthwestPartly Cloudy
4pm68°F20°C4 mph6 km/h SouthwestPartly Cloudy
5pm71°F21°C4 mph6 km/h SouthwestMostly Clear
DateLowHighWindDayNight
July 2652°F11°C73°F23°C3 mph6 km/h from SouthwestPartly CloudyMostly Cloudy
July 2754°F12°C75°F24°C4 mph7 km/h from SouthwestMostly ClearMostly Clear
July 2854°F12°C76°F25°C4 mph7 km/h from NorthwestClearClear
July 2955°F13°C77°F25°C6 mph10 km/h from NorthwestClearMostly Clear
July 3058°F15°C78°F26°C5 mph8 km/h from NorthwestMostly ClearMostly Clear
July 3159°F15°C78°F25°C5 mph7 km/h from WestMostly CloudyMostly Cloudy
August 160°F15°C74°F23°C5 mph8 km/h from SouthwestMostly CloudyMostly Cloudy

Yes

Low of 54°F12°C, High of 74°F24°C
Wind: 4 mph7 km/h
Precipitation: None

Support This Page