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Coldest sea in United Kingdom in September

914 coastal locations in United Kingdom ranked by typical September sea temperature, coldest first. Region-wide average in September: 15.8°C.

Coldest in September

Sumburgh

12.4°C September mean in United Kingdom

Regional September average

15.8°C

across all 914 coastal locations in United Kingdom

Vs annual mean

+3.8°C

above the year-round regional average

What the United Kingdom sea feels like in September

At this temperature, water will feel cold compared to a swimming pool, but with a bit of experience and practice most people will find the water relatively comfortable to swim in.

United Kingdom monthly average 8.1°C to 16.5°C
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  • Warmest month August 16.5°C
  • Coldest month February 8.1°C
  • Annual mean 12.0°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 United Kingdom month rankings:

United Kingdom sea temperature map (live)

The map shows today's latest reading at every United Kingdom location. The list below is based on the typical September mean.

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 coldest United Kingdom locations in September

Sorted by typical September mean from a decade of daily readings, coldest first. Click any place for the full location page.

# Location September mean
1 Sumburgh Scotland 12.4°C
2 Scalloway Shetland Islands 12.5°C
3 Bay of Quendale Shetland Islands 12.6°C
4 Sumburgh (Grutness Voe) Shetland Islands 12.6°C
5 Fair Isle Shetland Islands 12.6°C
6 Shetland Shetland Islands 12.6°C
7 West Burra Firth Shetland Islands 12.6°C
8 Foula Shetland Islands 12.7°C
9 Lerwick Scotland 12.7°C
10 Sandwick Scotland 12.7°C
11 Shetland Scotland 12.7°C
12 Burra Voe (Yell Sound) Shetland Islands 12.7°C
13 Dury Voe Shetland Islands 12.7°C
14 Mid Yell Shetland Islands 12.7°C
15 Toft Pier Shetland Islands 12.7°C
16 Tofts Voe Shetland Islands 12.7°C
17 Baltasound Pier Shetland Islands 12.7°C
18 Esha Ness (Hamna Voe) Shetland Islands 12.7°C
19 Hillswick Shetland Islands 12.7°C
20 Sullom Voe Shetland Islands 12.7°C
21 Out Skerries Orkney 12.8°C
22 Rockall Comhairle nan Eilean Siar 13.1°C
23 Muckle Skerry Orkney 13.2°C
24 Bur Wick Orkney 13.2°C
25 Burray Ness Orkney 13.2°C
Show 25 more ▸
26 Deer Sound Orkney 13.2°C
27 Newark Bay Orkney 13.2°C
28 St Mary's Bay Orkney 13.2°C
29 St. Mary's Orkney 13.2°C
30 Widewall Bay Orkney 13.2°C
31 Kyle of Lochalsh Scotland 13.2°C
32 Mallaig Scotland 13.2°C
33 Kettletoft Pier Orkney 13.3°C
34 Loth Orkney 13.3°C
35 Pierowall Orkney 13.3°C
36 Rapness Orkney 13.3°C
37 Whitehall Orkney 13.3°C
38 Castletown Highland Council 13.3°C
39 Isle of Skye Scotland 13.3°C
40 Kirkwall Scotland 13.3°C
41 Orkney Scotland 13.3°C
42 Portree Scotland 13.3°C
43 Egilsay Orkney 13.3°C
44 Scapa Flow Scotland 13.3°C
45 Gairloch Scotland 13.3°C
46 Loch Torridon Scotland 13.3°C
47 Scrabster Highland Council 13.3°C
48 Stromness Scotland 13.3°C
49 Thurso Scotland 13.3°C
50 Aberdeen Scotland 13.3°C

Warmest 10 in United Kingdom in September

Same data the other way. The warmest spots for the same month.

# Location September mean
1 Kessingland Suffolk 18.3°C
2 Minsmere Sluice Suffolk 18.3°C
3 Orford Ness Suffolk 18.3°C
4 Sandettie Bank Kent 18.3°C
5 Sunk Head Essex 18.2°C
6 Bawdsey Suffolk 18.2°C
7 Foreland (Lifeboat Slip) Isle of Wight 18.2°C
8 Harwich International Ferry Terminal Essex 18.2°C
9 Langstone Harbour Hampshire 18.2°C
10 Orford Haven Bar Suffolk 18.2°C

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