Swimming in Alaska in september 2025 Sea temperature by city in september
Do you want to go to the beach in Alaska in september 2025? Is it the right month to go for pleasant temperatures and staying in the water for a long time? The answer is on this page with the sea temperatures in september in Alaska by city and our opinion on the chances of enjoying pleasant sea conditions.
Sea temperature in Alaska in september 2025
Here, find the average sea temperature in Alaska in september in several coastal cities.
52°F
min: 50°F / max: 54°F
53°F
min: 50°F / max: 55°F
53°F
min: 50°F / max: 56°F
49°F
min: 46°F / max: 52°F
54°F
min: 51°F / max: 57°F
Cordova
54°F
min: 51°F / max: 57°F
Gambell (St. Lawrence Island)
44°F
min: 41°F / max: 47°F
Haines
51°F
min: 48°F / max: 54°F
Kenai
52°F
min: 50°F / max: 56°F
Kodiak
51°F
min: 49°F / max: 55°F
Kotzebue
47°F
min: 42°F / max: 52°F
Nome
49°F
min: 46°F / max: 53°F
Sand Point
52°F
min: 49°F / max: 54°F
Valdez
54°F
min: 51°F / max: 57°F
Where should you go swimming in Alaska in the month of september?
Swimming in Alaska in september is freezing
In september in Alaska swimming conditions are generally the same everywhere.
Forget about swimming in Anchorage, Anchor Point, Dillingham, Dutch Harbor, Ketchikan, Cordova, Gambell (St. Lawrence Island), Haines, Kenai, Kodiak, Kotzebue, Nome, Sand Point and Valdez in september! The water temperature is freezing, reaching as low as 50°F (and only 54°F at the best of times). Our advice: plan on sightseeing, and don't bring your beach towel!
Where to go swimming in Alaska in september: the map of sea temperatures
ideal swimming 
pleasant swimming 
cool swimming 
cold swimming 
freezing swimmingWater temperature and seasonal norms in september
Anchorage
| September | |||
| Average sea temperature | 52°F | ||
| Minimum sea temperature | 50°F | ||
| Maximum sea temperature | 54°F | ||
| Average outside temperature | 50°F | ||
| Maximum outside temperature | 56°F | ||
| Minimum outside temperature | 45°F | ||
| Precipitation | 4in | ||
| Number of days of precipitation | 6 jour(s) (20%) | ||
| Cloud cover | 45% | ||
| Our opinion | freezing swimming |
More information on swimming in Anchorage in september
Anchor Point
| September | |||
| Average sea temperature | 53°F | ||
| Minimum sea temperature | 50°F | ||
| Maximum sea temperature | 55°F | ||
| Average outside temperature | 50°F | ||
| Maximum outside temperature | 52°F | ||
| Minimum outside temperature | 49°F | ||
| Precipitation | 8.2in | ||
| Number of days of precipitation | 11 jour(s) (36%) | ||
| Cloud cover | 50% | ||
| Our opinion | freezing swimming |
More information on swimming in Anchor Point in september
Dillingham
| September | |||
| Average sea temperature | 53°F | ||
| Minimum sea temperature | 50°F | ||
| Maximum sea temperature | 56°F | ||
| Average outside temperature | 50°F | ||
| Maximum outside temperature | 56°F | ||
| Minimum outside temperature | 45°F | ||
| Precipitation | 5.4in | ||
| Number of days of precipitation | 8 jour(s) (28%) | ||
| Cloud cover | 58% | ||
| Our opinion | freezing swimming |
More information on swimming in Dillingham in september
Dutch Harbor
| September | |||
| Average sea temperature | 49°F | ||
| Minimum sea temperature | 46°F | ||
| Maximum sea temperature | 52°F | ||
| Average outside temperature | 50°F | ||
| Maximum outside temperature | 52°F | ||
| Minimum outside temperature | 49°F | ||
| Precipitation | 6.3in | ||
| Number of days of precipitation | 9 jour(s) (31%) | ||
| Cloud cover | 65% | ||
| Our opinion | freezing swimming |
More information on swimming in Dutch Harbor in september
Ketchikan
| September | |||
| Average sea temperature | 54°F | ||
| Minimum sea temperature | 51°F | ||
| Maximum sea temperature | 57°F | ||
| Average outside temperature | 54°F | ||
| Maximum outside temperature | 58°F | ||
| Minimum outside temperature | 50°F | ||
| Precipitation | 17in | ||
| Number of days of precipitation | 14 jour(s) (46%) | ||
| Cloud cover | 58% | ||
| Our opinion | freezing swimming |
More information on swimming in Ketchikan in september
List of coastal cities in Alaska
| Anchorage in september | freezing swimming |
| Anchor Point in september | freezing swimming |
| Dillingham in september | freezing swimming |
| Dutch Harbor in september | freezing swimming |
| Ketchikan in september | freezing swimming |
| Cordova in september | freezing swimming |
| Gambell (St. Lawrence Island) in september | freezing swimming |
| Haines in september | freezing swimming |
| Kenai in september | freezing swimming |
| Kodiak in september | freezing swimming |
| Kotzebue in september | freezing swimming |
| Nome in september | freezing swimming |
| Sand Point in september | freezing swimming |
| Valdez in september | freezing swimming |