Dadonghai Surf Break

Lat Long: 18.22° N 109.52° E

Dadonghai Surf Forecast and Surf Report

Issued: 1 pm 09 Aug 2026 (local time)

Forecast update in  hr  min

Today's Dadonghai sea temperature is
29.2° C
0.4° 

Dadonghai surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Dadonghai surf forecast from 9 Aug 2026:

  • Best quality surf: Monday 10 Aug, 11PM (local time) - 2.5ft (0.8m), 8s period, S swell with cross-offshore winds.
  • Most powerful swell: Friday 14 Aug, 5PM (local time) - 4.5ft (1.3m), 9s period, SSE swell with 243 kJ wave energy.
  • Next surfable swell (1★+): Monday 10 Aug, 11PM (local time) - 2.5ft (0.8m), 8s period with S swell.

Best Forecast Surf Conditions for Dadonghai this week:

The surf forecast for Dadonghai over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Aug 10) at 11PM. The primary swell is predicted to be 0.8m and 8s period with a secondary swell of 0.9m and 6s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Dadonghai in the next 16 days are 1.3m 9s and forecast to arrive on Friday (Aug 14) at 5PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 6s period and expected on Monday (Aug 10) at 5AM.

Wave TypeTime (CST) & Date Wave Height & Period
Next good surf (1 star+)11PM (Mon 10th Aug)2.5ft (0.8m) 8s
Best Surf11PM (Mon 10th Aug)2.5ft (0.8m) 8s
Most Powerful 5PM (Fri 14th Aug)4.5ft (1.3m) 9s

Table - best surf conditions forecast for Dadonghai over the next 16 days.


Short Range Forecast

Mostly dry. Warm (max 31°C on Sun afternoon, min 27°C on Sun night). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Warm (max 30°C on Wed afternoon, min 27°C on Wed night). Wind will be generally light.

Sun
9
Monday
10
Tuesday
11
Wednesday
12
Thursday
13
Friday
14
Saturday
15
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.5
S
8
1.3
WSW
6
0.6
S
8
0.8
S
8
0.7
S
8
0.7
SSE
9
0.8
SSE
8
0.8
SSE
8
0.7
S
8
0.9
SSE
8
0.9
SSE
8
0.8
SSE
8
1
SSE
8
1
S
8
0.9
SSE
8
1.3
SSE
9
1
SSE
8
1
SSE
8
1.3
SSE
9
1
SSE
8
Wave Graph
Metric surfscale
Energy kJ
30
109
49
92
69
77
87
96
69
107
112
83
147
131
105
243
140
133
232
140
Wind (km/h)
25
W
20
W
25
W
20
W
20
WNW
25
W
20
WSW
15
W
20
W
20
W
15
W
25
W
20
W
10
W
25
W
20
W
15
W
25
W
20
W
15
W
Wind State
cross
cross-off
cross
cross
cross-off
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
High Tide
7:36AM1.66m
8:44AM1.73m
9:46AM1.77m
10:43AM1.74m
1:13AM0.63m
11:35AM1.65m
1:17AM0.73m
12:23PM1.49m
1:33AM0.86m
Low Tide
4:06PM0.09m
4:59PM-0.00m
5:45PM-0.04m
6:24PM-0.01m
6:57PM0.07m
3:48AM0.58m
7:23PM0.18m
5:14AM0.55m
7:43PM0.31m
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
part cloud
clear
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:22
6:22
6:22
6:22
6:22
6:22
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:12
7:12
7:10
7:09
7:09
7:08
7:08
 mm
1
Temp °C
31
28
30
30
28
30
30
28
30
30
28
30
30
29
30
30
29
30
30
29
Feels °C
32
31
32
31
32
32
32
32
32
31
32
31
32
33
32
31
33
31
31
33
  • Map Icons:
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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Information about the Dadonghai Surf forecast

The above surf forecast table for Dadonghai provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Dadonghai can be found by selecting the local surf guide option on the grey menu. Our Dadonghai surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Dadonghai) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).

Further information to help with frequently asked questions about our surf forecast for Dadonghai may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.

Are you planning a holiday in Hainan? If you are looking for accommodation near Dadonghai, camping, hotels and holiday cottages in Hainan, consider staying in Sanya which is 4 km (2 miles) away. Other places in and around Hainan where you can find information about places to rent, and car hire include Bacun which is 63 km (39 miles) away, Li-an, Baoding and Baisha.

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