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Coldest sea in Thailand in September

89 coastal locations in Thailand ranked by typical September sea temperature, coldest first. Region-wide average in September: 29.5°C.

Coldest in September

Surin Islands

28.7°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.

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 Thailand 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 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
11 Ko Chang Tai 29.1°C
12 Ko Chang 29.1°C
13 Laem Ngop 29.1°C
14 Prachuap Khiri Khan 29.2°C
15 Ko Kut 29.2°C
16 Ban Mai 29.2°C
17 Ban Talat Yai 29.2°C
18 Ko Tao 29.2°C
19 Laem Sing 29.3°C
20 Ko Lak (Prachuap Khiri Khan) Prachuap Khiri Khan 29.3°C
21 Ao Muang Trat Chang Wat Trat 29.3°C
22 Map Ta Phut 29.3°C
23 Rayong 29.3°C
24 Samet 29.3°C
25 Lipa Noi 29.4°C
Show 25 more ▸
26 Mae Nam 29.4°C
27 Bo Phut Beach 29.4°C
28 Cape Panwa 29.4°C
29 Chaweng Beach 29.4°C
30 Choeng Mon Beach 29.4°C
31 Kalim Beach 29.4°C
32 Kamala Beach 29.4°C
33 Karon Beach 29.4°C
34 Kata Beach 29.4°C
35 Koh Phangan 29.4°C
36 Koh Samui 29.4°C
37 Mae Nam Beach 29.4°C
38 Nai Harn Beach 29.4°C
39 Patong Beach 29.4°C
40 Phuket 29.4°C
41 Rawai Beach 29.4°C
42 Surin Beach 29.4°C
43 Banana Beach 29.4°C
44 Lang Suan Chumphon 29.4°C
45 Chong Samet Chumphon 29.5°C
46 Taling Ngam Beach 29.5°C
47 Lamai Beach 29.5°C
48 Ko Taphao Noi (Phuket) Chang Wat Phuket 29.5°C
49 Ao Nang 29.6°C
50 Ao Sattahip Chonburi 29.6°C

Warmest 10 in Thailand in September

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

# 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

More on this region