Yes

you do need a jacket based on the weather in Ketchikan, AK 99901, USA 1 second ago

Why? Because the drizzle is not enough rain to call it "raining," but enough to make you a little soggy and you're not freezing, but you’ll definitely start complaining if it lasts much longer!
40°F4°C & Drizzle

Wind is 8 mph13 km/h from the South, gusting to 19 mph30 km/h
November 2
7am40°F4°C9 mph14 km/h SouthDrizzle
8am40°F4°C9 mph14 km/h SouthDrizzle
9am40°F4°C9 mph14 km/h SouthDrizzle
10am40°F4°C9 mph14 km/h SouthRain
11am39°F4°C8 mph13 km/h SouthDrizzle
12pm39°F4°C8 mph13 km/h SouthDrizzle
1pm39°F4°C8 mph13 km/h SouthDrizzle
2pm39°F4°C8 mph12 km/h SouthDrizzle
3pm39°F4°C7 mph12 km/h SouthDrizzle
4pm39°F4°C7 mph11 km/h SouthDrizzle
5pm40°F4°C7 mph12 km/h SouthDrizzle
6pm41°F5°C8 mph13 km/h SouthDrizzle
DateLowHighWindDayNight
November 140°F4°C43°F6°C8 mph14 km/h from SouthRainRain
November 239°F4°C43°F6°C9 mph14 km/h from SouthRainRain
November 339°F4°C42°F5°C6 mph9 km/h from EastDrizzleDrizzle
November 439°F4°C45°F7°C8 mph13 km/h from EastDrizzleCloudy
November 542°F6°C47°F8°C10 mph16 km/h from EastDrizzleRain
November 642°F5°C46°F8°C11 mph17 km/h from SoutheastRainRain
November 741°F5°C45°F7°C10 mph16 km/h from SoutheastRainRain

Yes

Low of 39°F4°C, High of 43°F6°C
Wind: 9 mph14 km/h
Precipitation: 83% rain

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