Swimming in Iceland in september 2025 Sea temperature by city in september

Do you want to go to the beach in Iceland 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 Iceland by city and our opinion on the chances of enjoying pleasant sea conditions.

Sea temperature in Iceland in september 2025

Here, find the average sea temperature in Iceland in september in several coastal cities.

South West in september

Reykjavík

on average:

50°F

min: 47°F / max: 52°F

Grindavík

on average:

51°F

min: 48°F / max: 53°F

Keflavík

on average:

50°F

min: 47°F / max: 53°F

Suðurnesjabær

on average:

50°F

min: 47°F / max: 53°F

Kopavogur

on average:

50°F

min: 47°F / max: 53°F

Mosfellsbaer

on average:

50°F

min: 47°F / max: 53°F

North in september

Akureyri

on average:

46°F

min: 43°F / max: 49°F

Raufarhöfn

on average:

46°F

min: 43°F / max: 49°F

Siglufjördur

on average:

45°F

min: 42°F / max: 48°F

Húsavík

on average:

46°F

min: 43°F / max: 49°F

Hvitserkur

on average:

45°F

min: 42°F / max: 49°F

Miðgarðar

on average:

45°F

min: 42°F / max: 48°F

West in september

Borgarnes

on average:

49°F

min: 46°F / max: 51°F

Ólafsvík

on average:

49°F

min: 46°F / max: 51°F

Snaefellsnes

on average:

49°F

min: 45°F / max: 51°F

Arnarstapi

on average:

49°F

min: 46°F / max: 51°F

Akranes

on average:

50°F

min: 47°F / max: 53°F

Westfjords in september

Djúpavík

on average:

46°F

min: 43°F / max: 49°F

Ísafjörður

on average:

46°F

min: 42°F / max: 49°F

Patreksfjörður

on average:

46°F

min: 43°F / max: 49°F

Flatey island

on average:

49°F

min: 46°F / max: 51°F

Hornstrandir

on average:

46°F

min: 42°F / max: 49°F

East in september

Hofn

on average:

49°F

min: 47°F / max: 52°F

Djúpivogur

on average:

49°F

min: 47°F / max: 52°F

Jokulsarlon

on average:

49°F

min: 47°F / max: 52°F

South in september

Vík í Mýrdal

on average:

51°F

min: 49°F / max: 54°F

Dyrholaey

on average:

51°F

min: 49°F / max: 53°F

Vestmannaeyjar (Vestmann island)

on average:

51°F

min: 49°F / max: 53°F

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Sea temperature in august in Iceland

Sea temperature in october in Iceland

Where should you go swimming in Iceland in the month of september?

Swimming in Iceland in september is freezing

In september in Iceland swimming conditions are generally the same everywhere.

Forget about swimming in Reykjavík, Akureyri, Borgarnes, Djúpavík, Grindavík, Hofn, Ísafjörður, Ólafsvík, Patreksfjörður, Raufarhöfn, Siglufjördur, Snaefellsnes, Vík í Mýrdal, Arnarstapi, Djúpivogur, Dyrholaey, Flatey island, Hornstrandir, Húsavík, Hvitserkur, Jokulsarlon, Keflavík, Miðgarðar, Suðurnesjabær, Þórshöfn, Akranes, Dalvik, Kopavogur, Mosfellsbaer, Seltjarnarnes, Vestmannaeyjar (Vestmann island) and Vogar in september! The water temperature is freezing, reaching as low as 47°F (and only 52°F at the best of times). Our advice: plan on sightseeing, and don't bring your beach towel!

Where to go swimming in Iceland in september: the map of sea temperatures

ideal swimming

pleasant swimming

cool swimming

cold swimming

freezing swimming

Water temperature and seasonal norms in september

Reykjavík

	August	September	October
Average sea temperature	53°F	50°F	47°F
Minimum sea temperature	50°F	47°F	45°F
Maximum sea temperature	56°F	52°F	50°F
Average outside temperature	54°F	49°F	43°F
Maximum outside temperature	58°F	52°F	45°F
Minimum outside temperature	50°F	47°F	41°F
Precipitation	3.9in	5.4in	4.4in
Number of days of precipitation	7 jour(s) (22%)	10 jour(s) (33%)	8 jour(s) (25%)
Cloud cover	60%	66%	63%
Our opinion	freezing swimming	freezing swimming	freezing swimming

More information on swimming in Reykjavík in september

Akureyri

	August	September	October
Average sea temperature	49°F	46°F	43°F
Minimum sea temperature	47°F	43°F	41°F
Maximum sea temperature	52°F	49°F	45°F
Average outside temperature	47°F	41°F	32°F
Maximum outside temperature	56°F	49°F	40°F
Minimum outside temperature	40°F	34°F	27°F
Precipitation	6.5in	8.2in	9.4in
Number of days of precipitation	10 jour(s) (33%)	11 jour(s) (37%)	12 jour(s) (39%)
Cloud cover	65%	65%	69%
Our opinion	freezing swimming	freezing swimming	freezing swimming

More information on swimming in Akureyri in september

Borgarnes

	August	September	October
Average sea temperature	52°F	49°F	46°F
Minimum sea temperature	49°F	46°F	43°F
Maximum sea temperature	54°F	51°F	49°F
Average outside temperature	54°F	49°F	43°F
Maximum outside temperature	58°F	52°F	45°F
Minimum outside temperature	50°F	47°F	41°F
Precipitation	3.9in	5.4in	4.4in
Number of days of precipitation	7 jour(s) (22%)	10 jour(s) (33%)	8 jour(s) (25%)
Cloud cover	60%	66%	63%
Our opinion	freezing swimming	freezing swimming	freezing swimming

More information on swimming in Borgarnes in september

Djúpavík

	August	September	October
Average sea temperature	48°F	46°F	45°F
Minimum sea temperature	46°F	43°F	42°F
Maximum sea temperature	51°F	49°F	49°F
Average outside temperature	50°F	47°F	40°F
Maximum outside temperature	54°F	50°F	41°F
Minimum outside temperature	47°F	43°F	38°F
Precipitation	2.6in	3.8in	3.5in
Number of days of precipitation	4 jour(s) (12%)	6 jour(s) (20%)	6 jour(s) (19%)
Cloud cover	61%	64%	65%
Our opinion	freezing swimming	freezing swimming	freezing swimming

More information on swimming in Djúpavík in september

Grindavík

	August	September	October
Average sea temperature	53°F	51°F	48°F
Minimum sea temperature	51°F	48°F	45°F
Maximum sea temperature	56°F	53°F	51°F
Average outside temperature	54°F	50°F	45°F
Maximum outside temperature	56°F	52°F	47°F
Minimum outside temperature	52°F	49°F	45°F
Precipitation	4.9in	8in	7.2in
Number of days of precipitation	7 jour(s) (24%)	13 jour(s) (42%)	11 jour(s) (36%)
Cloud cover	60%	64%	64%
Our opinion	freezing swimming	freezing swimming	freezing swimming

More information on swimming in Grindavík in september

List of coastal cities in Iceland

Reykjavík in september	freezing swimming
Akureyri in september	freezing swimming
Borgarnes in september	freezing swimming
Djúpavík in september	freezing swimming
Grindavík in september	freezing swimming
Hofn in september	freezing swimming
Ísafjörður in september	freezing swimming
Ólafsvík in september	freezing swimming
Patreksfjörður in september	freezing swimming
Raufarhöfn in september	freezing swimming
Siglufjördur in september	freezing swimming
Snaefellsnes in september	freezing swimming
Vík í Mýrdal in september	freezing swimming
Arnarstapi in september	freezing swimming
Djúpivogur in september	freezing swimming
Dyrholaey in september	freezing swimming
Flatey island in september	freezing swimming
Hornstrandir in september	freezing swimming
Húsavík in september	freezing swimming
Hvitserkur in september	freezing swimming
Jokulsarlon in september	freezing swimming
Keflavík in september	freezing swimming
Miðgarðar in september	freezing swimming
Suðurnesjabær in september	freezing swimming
Þórshöfn in september	freezing swimming
Akranes in september	freezing swimming
Dalvik in september	freezing swimming
Kopavogur in september	freezing swimming
Mosfellsbaer in september	freezing swimming
Seltjarnarnes in september	freezing swimming
Vestmannaeyjar (Vestmann island) in september	freezing swimming
Vogar in september	freezing swimming