See long range weather forecasts for the next 60 days for the Deep South Region. The Old Farmer's Almanac's scientifically-based, long range forecasts can be used to make more informed decisions about future plans that depend on the weather, from vacations and weddings to sporting events and outdoor activities.
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).
Key weather averages for Alaska in August. 1  17. 17Â°C max day temperature. 2  7. 7 hours of sunshine per day. 3  14. 14 days with some rainfall. 4  9. 9Â°C min night temperature. 5  16. 16 hours of daylight per day. 6  0. No heat & humidity. 7  64. 64 mm of monthly rainfall. 8  4. 4 (Moderate) UV index. 9  14. 14Â°C sea temperature.