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Warmest sea in United Kingdom in September

914 coastal locations in United Kingdom ranked by their typical September sea temperature. Region-wide average in September: 15.8°C. The top of the list is where to find the warmest swimming this month.

Warmest in September

Kessingland

18.3°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, 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 United Kingdom 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 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
11 Port Solent Portsmouth 18.2°C
12 Woodbridge Suffolk 18.2°C
13 Dunwich Suffolk 18.1°C
14 Southwold England 18.1°C
15 S.E. Long Sand Canterbury 18.1°C
16 Aldeburgh Suffolk 18.1°C
17 Chichester Harbour (Entrance) Hampshire 18.1°C
18 Itchenor West Sussex 18.1°C
19 Nab Tower Isle of Wight 18.1°C
20 Northney Hampshire 18.1°C
21 Selsey Bill West Sussex 18.1°C
22 Sizewell Suffolk 18.1°C
23 Birchington-on-Sea Kent 18.1°C
24 Richborough Kent 18.1°C
25 Christchurch (Entrance) Dorset 18.0°C
Show 25 more ▸
26 Freshwater Bay Isle of Wight 18.0°C
27 Hurst Point Hampshire 18.0°C
28 Totland Bay Isle of Wight 18.0°C
29 Bradwell on Sea Essex 18.0°C
30 Bramble Creek Essex 18.0°C
31 Burnham-on-Crouch Essex 18.0°C
32 Colchester Essex 18.0°C
33 Eastney Hampshire 18.0°C
34 Fareham England 18.0°C
35 Gosport Hampshire 18.0°C
36 Hill Head Hampshire 18.0°C
37 Holliwell Point Essex 18.0°C
38 Lee on the Solent Hampshire 18.0°C
39 Maldon Essex 18.0°C
40 North Fambridge Essex 18.0°C
41 Osea Island Essex 18.0°C
42 Portsmouth Hampshire 18.0°C
43 Rochford Essex 18.0°C
44 Shivering Sand Essex 18.0°C
45 Shivering Sands Kent 18.0°C
46 Southsea Hampshire 18.0°C
47 Tollesbury Essex 18.0°C
48 Whitaker Beacon Essex 18.0°C
49 Ipswich Suffolk 18.0°C
50 Calshot Hampshire 18.0°C

Coldest 10 in United Kingdom in September

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

# 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

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