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Warmest sea in Thailand in December

89 coastal locations in Thailand ranked by their typical December sea temperature. Region-wide average in December: 28.4°C. The top of the list is where to find the warmest swimming this month.

Warmest in December

Ko Lipe

29.1°C December mean in Thailand

Regional December average

28.4°C

across all 89 coastal locations in Thailand

Vs annual mean

-1.0°C

below the year-round regional average

What the Thailand sea feels like in December

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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D
  • 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 December fits in the year

December 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 December 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 December

Sorted by the typical December 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 December mean
1 Ko Lipe 29.1°C
2 Ko Butang Satun 29.0°C
3 Kantang 29.0°C
4 Banana Beach 29.0°C
5 Ko Lanta 28.9°C
6 Cape Panwa 28.9°C
7 Kalim Beach 28.9°C
8 Kamala Beach 28.9°C
9 Karon Beach 28.9°C
10 Kata Beach 28.9°C
11 Nai Harn Beach 28.9°C
12 Patong Beach 28.9°C
13 Phuket 28.9°C
14 Rawai Beach 28.9°C
15 Surin Beach 28.9°C
16 Ko Don Ao Nang 28.9°C
17 Ko Lela Satun 28.9°C
18 Ko Phetra Malacca 28.9°C
19 Pak Nam Trang Chang Wat Trang 28.9°C
20 Khao Lak 28.9°C
21 Ko Taphao Noi (Phuket) Chang Wat Phuket 28.9°C
22 Ko Koi Noi Satun 28.8°C
23 Langkawi Chang Wat Satun 28.8°C
24 Ko Yao 28.8°C
25 Ao Nang 28.8°C
Show 25 more ▸
26 Ban Ao Nang 28.8°C
27 Ko Mak 28.8°C
28 Ko Phi Phi Don 28.8°C
29 Ko Wai 28.8°C
30 Krabi 28.8°C
31 Phi Phi Islands 28.8°C
32 Railay Beach 28.8°C
33 Bangtao Beach 28.8°C
34 Mai Khao Beach 28.8°C
35 Nai Yang Beach 28.8°C
36 Ko Kut 28.8°C
37 Similan Islands 28.8°C
38 Ao Muang Trat Chang Wat Trat 28.7°C
39 Ko Chang Tai 28.7°C
40 Ko Chang 28.7°C
41 Laem Ngop 28.7°C
42 Ao Nang (Krabi) Chang Wat Krabi 28.7°C
43 Ko Miang Phangnga 28.7°C
44 Ko Surin Phang-nga 28.5°C
45 Map Ta Phut 28.5°C
46 Laem Sing 28.5°C
47 Surin Islands 28.4°C
48 Rayong 28.4°C
49 Samet 28.4°C
50 Chang Ko Phra Thong Phang-nga 28.4°C

Coldest 10 in Thailand in December

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

# Location December mean
1 Ban Mai 27.1°C
2 Ban Talat Yai 27.1°C
3 Mae Klong Chang Wat Samut Songkhram 27.4°C
4 Bangkok Bar Central Thailand 27.7°C
5 Lang Suan Chumphon 27.7°C
6 Ko Lak (Prachuap Khiri Khan) Prachuap Khiri Khan 27.7°C
7 Ko Prap Surat Thani Province 27.7°C
8 Hua Hin 27.8°C
9 Bangkok 27.8°C
10 Phra Pradaeng 27.8°C

More on this region