The highest day temperature in September 2026 was 69°F. The lowest night temperature was 44°F. The average values for day and night temperatures during September were 57.5°F и 51.5°F respectivly.

The average sea surface temperature in September 2026 for Ketchikan was 56.6°F. The maximum and minimum values were 52.6°F and 59.0°F respectively.

Most of the days in September are gloomy but you can also expect sunny days.

Precipitation total in September for Ketchikan is 3.6 in.

The average wind speed in September is 8.7 mph.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Ketchikan in September is 4.0 hours.