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).
Graph of average and extreme temperature ranges by day for Sitka, AK. The warmest month in Sitka Rocky Gutierrez, Sitka, Alaska is August with an average high temperature of 62.9Â°F. The hottest day on record was July 31 1976 when the temperature hit 88.0Â°F. During January the overnight temperature drops to an average of 31.6Â°F with the lowest temperature of 2.1Â°F being recorded on January 9 1975.