17.05
sun
sun
Day
88°F
NW 5 mph
Precip.
100%
100%
Night
75°F
NW 4 mph
Precip.
0%
0%
18.05
mon
mon
Day
88°F
N 4 mph
Precip.
100%
100%
Night
75°F
N 3 mph
Precip.
100%
100%
19.05
tue
tue
Day
75°F
NW 3 mph
Precip.
100%
100%
Night
72°F
N 4 mph
Precip.
0%
0%
20.05
wed
wed
Day
88°F
N 6 mph
Precip.
76%
76%
Night
73°F
N 4 mph
Precip.
0%
0%
21.05
thu
thu
Day
88°F
N 4 mph
Precip.
100%
100%
Night
75°F
N 4 mph
Precip.
0%
0%
22.05
fri
fri
Day
90°F
NE 1 mph
Precip.
100%
100%
Night
75°F
N 4 mph
Precip.
0%
0%
23.05
sat
sat
Day
90°F
NE 3 mph
Precip.
0%
0%
Night
77°F
N 5 mph
Precip.
0%
0%
24.05
sun
sun
Day
91°F
N 5 mph
Precip.
0%
0%
Night
77°F
N 6 mph
Precip.
0%
0%
25.05
mon
mon
Day
93°F
NE 5 mph
Precip.
0%
0%
Night
79°F
N 5 mph
Precip.
0%
0%
26.05
tue
tue
Day
93°F
NE 4 mph
Precip.
0%
0%
Night
79°F
N 4 mph
Precip.
0%
0%
27.05
wed
wed
Day
95°F
E 4 mph
Precip.
0%
0%
Night
77°F
N 2 mph
Precip.
100%
100%
28.05
thu
thu
Day
88°F
SE 4 mph
Precip.
100%
100%
Night
77°F
N 2 mph
Precip.
25%
25%
29.05
fri
fri
Day
86°F
E 2 mph
Precip.
100%
100%
Night
75°F
N 2 mph
Precip.
29%
29%
30.05
sat
sat
Day
86°F
SE 2 mph
Precip.
100%
100%
Night
77°F
N 3 mph
Precip.
100%
100%
Sea water temperature in May, °F
Show year:
2026
2025
2024
The average sea water temperature in May of 2026 was 83.0°F. The highest and lowest sea temperatures during the month were 86.7°F and 81.3°F.
Air temperature in Hainan, °F
Precipitation total in Hainan, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Hainan
Hainan on a weather map
Places in China:
Name
°F
24 Hours Forecast
Hainan
Local time: 06:16
May 17, sunday
0900
81°F
NW
4 mph
4 mph
1200
88°F
NW
5 mph
5 mph
1500
86°F
NW
6 mph
6 mph
1800
81°F
NW
4 mph
4 mph
2100
75°F
N
5 mph
5 mph
May 18, monday
0000
75°F
NW
4 mph
4 mph
0300
73°F
N
4 mph
4 mph
0600
73°F
NW
4 mph
4 mph
