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).
Wasilla, Alaska Average Temperature. The average temperature for Wasilla is 37.8Â°F, 31% lower than the nationwide average (54.55Â°F), and 1.72Â°F higher than the Alaska average of 36.08Â°F. In the summer, temperatures rise to 55.2Â°F on average, 23% lower than average - one of the 20% lowest recorded averages.