Measurements:
°C
°F
Hainan
76°F
E 6 mph
Feels like: 82°F
Precip: 100%
World Resorts China Hainan Weather

Hainan Sea Water Temperature

Current Sea Water Temperature:
+91.8°F
Maximum Sea Water Temperature in July: 94.2°F
Minimum Sea Water Temperature in July: 85.8°F
Average water temperature in July: 90.7°F

Sea Water Temperature for the Last 10 Days:

July 20 91.8°F July 15 90.0°F
July 19 91.8°F July 14 90.2°F
July 18 91.8°F July 13 90.0°F
July 17 90.6°F July 12 90.2°F
July 16 90.0°F July 11 90.2°F

When is the Warmest Sea for Hainan?

According to our data for the last three years for Hainan the highest average sea water temperature was in July, June and August.

Average Water Temperature by Month, °F

Sea Water Temperature in July

Select Year: 2025 2024 2023

The average sea surface temperature in July 2025 for Hainan was 90.0°F. The maximum and minimum values were 89.0°F and 91.8°F respectively.

Sea Water Temperature in June

Select Year: 2025 2024 2023

The average sea surface temperature in June 2025 for Hainan was 90.2°F. The maximum and minimum values were 89.4°F and 91.2°F respectively.

Sea Water Temperature in August

Select Year: 2024 2023 2022

The average sea surface temperature in August 2024 for Hainan was 91.3°F. The maximum and minimum values were 89.6°F and 92.6°F respectively.

Best Time to Visit Hainan
The most sunny months:
June 12 days
May 11 days
April 11 days
The most warm months:
June 94.3 °F
July 93.5 °F
May 93.3 °F
Warmest sea temperature:
July 90.7 °F
June 90.4 °F
August 90.3 °F
The most cold months:
December 71.4 °F
January 72.0 °F
February 77.0 °F
The most rainy months:
August 15 days
July 15 days
September 15 days
The most windy months:
March 4 mph
April 4 mph
October 4 mph

Hainan on the Weather Map

China Resorts:
NAME
Beidaihe +80
Beijing +80
Dadunhai +82
Dalian +82
Guangzhou +84
Hainan +76
Hangzhou +90
Hong Kong +86
Macau +86
Quingdao +86
Sanya +82
Shanghai +88
Shenzhen +84
Weihai +84
Yalong Bay +82
24 Hours Weather Forecast
Hainan
Local time: 18:06
20 jul, sunday
2100 76°F
NE
7 mph
21 jul, monday
0000 76°F
NE
9 mph
0300 78°F
NE
11 mph
0600 76°F
NE
6 mph
0900 76°F
N
6 mph
1200 78°F
NE
2 mph
1500 80°F
N
2 mph
1800 78°F
N
2 mph