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Warmest sea in Thailand in September

89 coastal locations in Thailand ranked by their typical September sea temperature. Region-wide average in September: 29.5°C. The top of the list is where to find the warmest swimming this month.

Warmest in September

Mae Klong

30.0°C September mean in Thailand

Regional September average

29.5°C

across all 89 coastal locations in Thailand

Vs annual mean

+0.0°C

above the year-round regional average

What the Thailand sea feels like in September

This water temperature is comparable to that of a swimming pool, but it might be higher than most open water swimmers prefer for serious swimming. Make sure to drink plenty of water before and after swimming and don't wear a wetsuit to avoid overheating.

Thailand monthly average 28.1°C to 30.7°C
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  • Warmest month May 30.7°C
  • Coldest month January 28.1°C
  • Annual mean 29.5°C
  • Months above 20°C 12 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 Thailand month rankings:

Thailand sea temperature map (live)

The map shows today's latest reading at every Thailand 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 Thailand 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 Mae Klong Chang Wat Samut Songkhram 30.0°C
2 Ko Koi Noi Satun 30.0°C
3 Langkawi Chang Wat Satun 30.0°C
4 Ko Lela Satun 29.9°C
5 Bangkok Bar Central Thailand 29.9°C
6 Ko Don Ao Nang 29.9°C
7 Pak Nam Trang Chang Wat Trang 29.9°C
8 Ko Butang Satun 29.8°C
9 Ko Phetra Malacca 29.8°C
10 Ko Lipe 29.8°C
11 Bangkok 29.8°C
12 Phra Pradaeng 29.8°C
13 Kantang 29.8°C
14 Ko Si Chang 29.8°C
15 Si Racha 29.8°C
16 Bang Lamung 29.7°C
17 Jomtien Beach 29.7°C
18 Ko Lan 29.7°C
19 Pattaya 29.7°C
20 Ao Nang (Krabi) Chang Wat Krabi 29.7°C
21 Narathiwat 29.7°C
22 Pattani 29.7°C
23 Tak Bai 29.7°C
24 Yaring 29.7°C
25 Hua Hin 29.6°C
Show 25 more ▸
26 Sattahip 29.6°C
27 Ko Lanta 29.6°C
28 Bangtao Beach 29.6°C
29 Mai Khao Beach 29.6°C
30 Nai Yang Beach 29.6°C
31 Khanom Beach 29.6°C
32 Ko Prap Surat Thani Province 29.6°C
33 Ko Yao 29.6°C
34 Ao Nang 29.6°C
35 Ao Sattahip Chonburi 29.6°C
36 Ban Ao Nang 29.6°C
37 Chong Khram Ranong 29.6°C
38 Ko Phi Phi Don 29.6°C
39 Krabi 29.6°C
40 Phi Phi Islands 29.6°C
41 Railay Beach 29.6°C
42 Ko Taphao Noi (Phuket) Chang Wat Phuket 29.5°C
43 Lamai Beach 29.5°C
44 Chong Samet Chumphon 29.5°C
45 Taling Ngam Beach 29.5°C
46 Lang Suan Chumphon 29.4°C
47 Banana Beach 29.4°C
48 Bo Phut Beach 29.4°C
49 Cape Panwa 29.4°C
50 Chaweng Beach 29.4°C

Coldest 10 in Thailand in September

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

# Location September mean
1 Surin Islands 28.7°C
2 Ranong 28.7°C
3 Pak Nam Ranong Chang Wat Ranong 28.8°C
4 Similan Islands 28.8°C
5 Ko Surin Phang-nga 28.9°C
6 Chang Ko Phra Thong Phang-nga 28.9°C
7 Ko Miang Phangnga 29.0°C
8 Khao Lak 29.0°C
9 Ko Mak 29.1°C
10 Ko Wai 29.1°C

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