World sea water temperatures

Water temperature in Ketchikan (AK) in September

Home > United States > Alaska > Ketchikan

Is it warm enough to swim in Ketchikan in September? Average water temperature in Ketchikan in September is 54.7°F and therefore is not suitable for comfortable swimming. The warmest sea in Ketchikan in September is 60.4°F, and the coldest is 50.2°F. Average high air temperature in Ketchikan in September is 59°F, and average low temperature is 47°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Ketchikan

Changes water temperature in Ketchikan in September 2025, 2024

To get an accurate forecast for the water temperature in Ketchikan for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Ketchikan, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of September.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
September 161.9°F55.6°F54°F61.9°F
September 263.1°F55.6°F54°F63.1°F
September 361.9°F55.4°F54°F61.9°F
September 461.3°F55.4°F54°F61.3°F
September 560.3°F55.8°F53.6°F60.3°F
September 660.1°F56.3°F53.4°F60.1°F
September 759.5°F56.1°F53.6°F59.5°F
September 858.5°F55.8°F53.8°F58.6°F
September 956.5°F55.2°F53.8°F58.6°F
September 1057.2°F55.4°F53.6°F60.4°F
September 1157°F55.6°F53.2°F59.9°F
September 1256.8°F56.5°F52.3°F59.5°F
September 1356.5°F56.5°F52.5°F58.8°F
September 1456.1°F56.3°F52.9°F59.2°F
September 1555.9°F56.1°F52.7°F59°F
Day 2025 2024 Min Max
September 1655.9°F55.8°F52.9°F57.9°F
September 1757°F55.4°F52.7°F57.2°F
September 1856.7°F54.3°F52.5°F56.8°F
September 1956.3°F54.5°F52.3°F56.7°F
September 2056.1°F54.1°F52.9°F56.1°F
September 2155.6°F53.8°F52.5°F56.7°F
September 2254.7°F53.6°F52.3°F57°F
September 2354.5°F53.4°F51.8°F56.3°F
September 2454°F52.7°F51.6°F55.8°F
September 2553.8°F54.7°F51.6°F55.2°F
September 2653.8°F54.1°F50.9°F54.9°F
September 2753.2°F53.6°F50.7°F54.3°F
September 2853.1°F51.6°F50.2°F54.1°F
September 2952.9°F51.4°F50.2°F54.3°F
September 3052.7°F51.6°F50.2°F54°F
Ketchikan water temp chart in September

Average water temperature in Ketchikan in September over a decade

20162017201820192020
54.7°F55.8°F55°F56.5°F56.3°F
20212022202320242025
54.5°F56.1°F54.7°F54.7°F

Ketchikan sea state in September

Chart comparing the height of waves in Ketchikan in September over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.

Waves height in Ketchikan in September

Weather and climate in Ketchikan in September

This data display average monthly climate indicators in Ketchikan in September based on our historical weather readings over a period of ten years. In addition to temperature, we include data on the number of rainy and sunny days so you can have all the information about your destination before your trip

  • Average HIGH temperature59°F
  • Average LOW temperature47°F
  • Average rainfall days19 days
  • Average rainfall361mm/14.2''
  • Average daylight13h
  • Average sunshine3h
  • Average UV index3

Ketchikan water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Where is the warm sea water in September?

Want to know where the water temperature in September is good for swimming? Select the continent of interest, the day of the month and the required water temperature

Region
Date (day and month)
Water temperature: min 60°F
 Average temperature  Maximum temperature

Temperature in neighboring cities

The nearest locations with the average water temperature in September. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
Metlakatla54.5°F50.5°F59.5°F
Wrangell51.6°F47.1°F56.1°F
Prince Rupert53.2°F50°F57°F
Haida Gwaii57.4°F53.1°F61.7°F
Sitka54.1°F50.5°F58.3°F
Gustavus50.7°F46.9°F55.2°F
Glacier Bay50°F45.3°F55.4°F
Skagway50.9°F47.1°F56.5°F
Port Hardy51.8°F47.7°F55.8°F
Port McNeill51.3°F48.2°F55°F

United States photo gallery

  • United States
  • Sunrise - Sebastian Inlet State Park.
  • United States
  • United States

If you have interesting photos of this place, you can upload them here. Photos will be available to all users after verification by the moderator.

Vote for Alaska best beach

Current rating: (0 votes cast)

If you know this place (Ketchikan) and want to leave your comment or rate it, then fill out the following form.

Your rating for this place:

Does this place have a "Blue Flag" award [1], are there rip currents and what type of beach is it, sand or pebble:

Is the beach a dog-friendly place, child friendly or a nudist beach?


Your comments for this place (water quality, crowds, facilities, activities, lifeguards, service etc.):



[1] - The "Blue Flag" is awarded to beaches which fulfill a number of criteria, including: the quality of the bathing water, which must be in accordance with the relevant European Union Directive environmental education and information and beach area management and safety.

:


Get widget or API for your website

Our report for Ketchikan is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.

Contact us: admin@seatemperature.info
privacy policy