alaska daylight hours in september
Weather in Alaska in September. The average maximum daytime temperature in Alaska in September is a cool 13Â°C (55Â°F). There are usually 5 hours of bright sunshine each day, which represents 41% of the 13 hours of daylight. The average sea temperature in and around Alaska in September is 12Â°C (54Â°F). Expect 68mm (2.7 inches) of rainfall across the whole of September with 14 days with some rain falling.