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Warmest sea in Norway in September

250 coastal locations in Norway ranked by their typical September sea temperature. Region-wide average in September: 13.9°C. The top of the list is where to find the warmest swimming this month.

Warmest in September

Sjolyststranda

20.6°C September mean in Norway

Regional September average

13.9°C

across all 250 coastal locations in Norway

Vs annual mean

+4.3°C

above the year-round regional average

What the Norway sea feels like in September

Water at this temperature is cold and will feel very cold initially, but the body will get used to it and longer swims are possible. Experienced swimmers can manage several hours of swimming, however hypothermia is still a real risk.

Norway monthly average 5.0°C to 15.0°C
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  • Warmest month August 15.0°C
  • Coldest month March 5.0°C
  • Annual mean 9.5°C
  • Months above 20°C 0 of 12

Where September fits in the year

September sits inside the regional pattern shown on the left. Pick a different month to see how the ranking shifts.

All twelve Norway month rankings:

Norway sea temperature map (live)

The map shows today's latest reading at every Norway location. The list below is based on the typical September mean, useful for trip planning weeks or months ahead.

Zoom in to see individual locations. Click a pin for water temperatures. View list →
°C -2 0 1 3 5 7 9 11 13 15 17 19 21 24 27 30 35

Top 50 warmest Norway locations in September

Sorted by the typical September mean built from a decade of daily readings at each location. Click any place for its 30-day chart, monthly profile, and full 10-year history.

# Location September mean
1 Sjolyststranda 20.6°C
2 Asgardstrand 16.2°C
3 Horten 16.2°C
4 Tonsberg 16.2°C
5 Fredrikstad 16.2°C
6 Larkollen 16.2°C
7 Lervik 16.2°C
8 Moss 16.2°C
9 Oslofjord 16.2°C
10 Årøysund Vestfold og Telemark 16.1°C
11 Skjærhalden Viken 16.1°C
12 Ytre Skålevik Agder 16.1°C
13 Melsomvik 16.1°C
14 Flekkefjord 16.1°C
15 Drobak 16.1°C
16 Fagerstrand 16.1°C
17 Lysaker 16.1°C
18 Nesoddtangen 16.1°C
19 Oslo 16.1°C
20 Sandvika 16.1°C
21 Selvik 16.1°C
22 Slemmestad 16.1°C
23 Svelvik 16.1°C
24 Tofte 16.1°C
25 Tomra 16.1°C
Show 25 more ▸
26 Langesund 16.1°C
27 Porsgrunn 16.1°C
28 Rafnes 16.1°C
29 Larvik 16.1°C
30 Sandefjord 16.1°C
31 Viker Hvaler 16.1°C
32 Forsand 16.1°C
33 Helgeroa Vestfold og Telemark 16.1°C
34 Nevlunghavn Vestfold og Telemark 16.1°C
35 Tvedestrand 16.0°C
36 Åros Viken 16.0°C
37 Mandal 16.0°C
38 Oscarsborg Frogn 16.0°C
39 Sætre Viken 16.0°C
40 Sjølyststranda Oslo 16.0°C
41 Tregde Agder 16.0°C
42 Kragero 16.0°C
43 Fevik 16.0°C
44 Grimstad 16.0°C
45 Justvik 15.9°C
46 Kristiansand 15.9°C
47 Søgne Agder 15.9°C
48 Stavern 15.9°C
49 Farsund 15.9°C
50 Vestbygd 15.9°C

Coldest 10 in Norway in September

Same data the other way. Helpful if you want to know which Norway coasts to avoid for swimming in September.

# Location September mean
1 Ny-Alesund 4.6°C
2 Jan Mayen 5.3°C
3 Dale 8.8°C
4 Varangerbotn 9.4°C
5 Kvalsund 9.5°C
6 Batsfjord 9.5°C
7 Varde 9.6°C
8 Honningsvag 9.6°C
9 Mehamn 9.6°C
10 Berlevag Troms og Finnmark 9.7°C

More on this region