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Warmest sea in China in September

316 coastal locations in China ranked by their typical September sea temperature. Region-wide average in September: 27.1°C. The top of the list is where to find the warmest swimming this month.

Warmest in September

Chengjiang

30.0°C September mean in China

Regional September average

27.1°C

across all 316 coastal locations in China

Vs annual mean

+6.7°C

above the year-round regional average

What the China 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.

China monthly average 12.1°C to 28.2°C
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  • Warmest month August 28.2°C
  • Coldest month February 12.1°C
  • Annual mean 20.5°C
  • Months above 20°C 6 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 China month rankings:

China sea temperature map (live)

The map shows today's latest reading at every China 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 China 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 Chengjiang 30.0°C
2 Guanbu 30.0°C
3 Guandu 30.0°C
4 Beihai Gang Guangxi Zhuangzuzizhiqu 30.0°C
5 Fangcheng Gang Guangxi Zhuangzuzizhiqu 30.0°C
6 Caotan 29.9°C
7 Cheban 29.9°C
8 Yingzai 29.9°C
9 Beihai 29.9°C
10 Dadunhai 29.9°C
11 Fangcheng 29.9°C
12 Fengshan 29.9°C
13 Houzhai 29.9°C
14 Majiao 29.9°C
15 Hepu 29.9°C
16 Shapa 29.9°C
17 Leluo 29.9°C
18 Fangchenggang 29.8°C
19 Baoshan 29.5°C
20 Yangpu Gang Hainan Sheng 29.5°C
21 Eman 29.5°C
22 Guangcun 29.5°C
23 Hailingshan Dao Guangdong Sheng 29.5°C
24 Hongqi 29.5°C
25 Scarborough Shoal Hainan 29.5°C
Show 25 more ▸
26 Xinhui 29.5°C
27 Chenghua 29.5°C
28 Diancheng Guangdong Province 29.5°C
29 Sanya Gang Hainan 29.5°C
30 Xiachuan 29.5°C
31 Xinxing 29.5°C
32 Baimajing 29.5°C
33 Paipu 29.5°C
34 Xiachuan Dao Guangdong Sheng 29.5°C
35 Paracel Islands Hainan 29.4°C
36 Tiaolou 29.4°C
37 Yalong Bay 29.4°C
38 Yalong Wan 29.4°C
39 Naozhou Dao Guangdong Province 29.4°C
40 Shangchuan 29.4°C
41 Zhanjiang 29.4°C
42 Potou 29.4°C
43 Xiashan 29.4°C
44 Haitangwan 29.4°C
45 Sanya 29.4°C
46 Tianya 29.4°C
47 Chuandao 29.4°C
48 Nanshui 29.4°C
49 Yangjiang 29.4°C
50 Basuo Hainan Sheng 29.3°C

Coldest 10 in China in September

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

# Location September mean
1 Keren 15.2°C
2 Jiguan 19.8°C
3 Juexi 19.8°C
4 Shengli 20.3°C
5 Xiaomo 20.6°C
6 Honghai 21.3°C
7 Lian 22.1°C
8 Beishan 22.6°C
9 Chang Zui Liaoning Sheng 23.0°C
10 Changchun 23.0°C

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