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Water temperature in Anchorage (AK) in September

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Is it warm enough to swim in Anchorage in September? Average water temperature in Anchorage in September is 53.8°F and therefore is not suitable for comfortable swimming. The warmest sea in Anchorage in September is 59.7°F, and the coldest is 47.8°F. Average high air temperature in Anchorage in September is 56°F, and average low temperature is 41°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Anchorage

Changes water temperature in Anchorage in September 2025, 2024

To get an accurate forecast for the water temperature in Anchorage for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Anchorage, 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 157.7°F55°F55°F58.8°F
September 257.6°F55°F55°F59.4°F
September 357.9°F55.4°F54.9°F59°F
September 458.1°F55.4°F54.9°F58.6°F
September 557.9°F55.2°F54.3°F58.3°F
September 657.6°F55°F54.1°F57.9°F
September 757.4°F55.4°F54°F59.7°F
September 857°F55.2°F53.6°F58.8°F
September 956.8°F55°F52.9°F58.3°F
September 1056.5°F54.9°F52.7°F57.9°F
September 1156.1°F54.5°F52.2°F58.1°F
September 1255.8°F54.3°F52°F57.6°F
September 1355.6°F54.3°F51.6°F57.2°F
September 1455.2°F54.5°F51.3°F57°F
September 1554.5°F55.2°F51.1°F58.1°F
Day 2025 2024 Min Max
September 1654.1°F53.4°F51.1°F57.4°F
September 1753.8°F52.7°F51.4°F57.2°F
September 1854.3°F52.3°F51.1°F56.5°F
September 1954°F52.5°F51.1°F56.7°F
September 2053.6°F52.5°F50.9°F56.1°F
September 2153.2°F52.5°F51.1°F55.9°F
September 2252.3°F52°F50.5°F55.9°F
September 2352.3°F52°F50.5°F55.8°F
September 2452.2°F51.8°F49.8°F55.4°F
September 2552.2°F51.6°F49.8°F55°F
September 2652°F51.4°F49.3°F54.5°F
September 2751.6°F51.3°F48.7°F54.1°F
September 2850.4°F50.7°F48.6°F53.4°F
September 2950.9°F51.1°F48.4°F53.6°F
September 3050.9°F50.2°F47.8°F53.4°F
Anchorage water temp chart in September

Average water temperature in Anchorage in September over a decade

20162017201820192020
54.7°F53.6°F55.6°F56.5°F54.7°F
20212022202320242025
53.4°F53.4°F53.2°F53.4°F

Anchorage sea state in September

Chart comparing the height of waves in Anchorage 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 Anchorage in September

Weather and climate in Anchorage in September

This data display average monthly climate indicators in Anchorage 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 temperature56°F
  • Average LOW temperature41°F
  • Average humidity
    76
  • Average rainfall days15 days
  • Average rainfall76mm/3''
  • Average daylight13h
  • Average sunshine5.3h
  • Average UV index2

Anchorage 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
Whittier51.4°F46.6°F55.6°F
Kenai53.1°F49.3°F57.7°F
Seward53.1°F48.7°F57.4°F
Cook Inlet52.7°F49.1°F56.7°F
Prince William Sound53.4°F48.7°F58.8°F
Anchor Point50.9°F48.2°F54.7°F
Homer51.1°F48.2°F55.8°F
Valdez52.5°F48.7°F57.9°F
Cordova52.9°F49.1°F57.4°F
Kodiak50.4°F46.8°F55.8°F

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Our report for Anchorage 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.

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