Surf spot

Dadonghai

Forecast conditions and map view for Dadonghai in China, South China Sea. Open the interactive surf map to inspect wind, waves, and nearby spots.

Country: China, South China Sea
Coordinates: 18.2209, 109.5177

Metric
Metric	18:00	21:00	00:00	03:00	06:00	09:00	12:00	15:00	18:00	21:00	00:00	03:00	06:00	09:00	12:00	15:00	18:00	21:00	00:00	03:00	06:00	09:00	12:00	15:00	18:00	21:00	00:00	03:00	06:00	09:00	12:00	15:00	18:00	21:00	00:00	03:00	06:00	09:00	12:00	15:00	18:00	21:00	00:00	03:00	06:00	09:00	12:00	15:00	18:00	21:00	00:00	03:00	06:00	09:00	12:00	15:00
Wave height (m)	0.5	0.5	0.5	0.4	0.4	0.7	0.8	0.9	0.9	0.9	0.9	1.1	1.1	0.9	0.9	0.9	0.8	0.8	0.8	0.8	0.8	0.7	0.6	0.5	0.5	0.5	0.4	0.4	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.2	0.2	0.2	0.3	0.4	0.3	0.3	0.3	0.2	0.3	0.3	0.3
Wave direction	ESE	ESE	SE	SE	SE	SSE	SSE	SSE	SSE	SSE	SSE	SSE	SSE	SSE	SSE	SSE	SSE	SSE	SSE	SSE	SSE	S	S	S	S	S	S	S	S	S	S	S	SSE	S	S	S	S	S	S	SSE	SSE	SSE	SSE	S	S	S	ESE	ESE	E	ESE	ESE	ESE	ESE	ESE	ESE	ESE
Wave period (s)	5.1	5	4.3	5.5	5.5	4.7	5.1	5	5.2	5.4	5.7	5.5	5.3	5.3	5.2	5	4.8	4.5	4.3	4.3	4.2	4.3	4	4.2	3.9	3.6	3.5	3.5	3.5	3.5	3.6	3.5	2.9	3	3	3	3.1	3	3	3.1	3.1	3	3.1	3.2	3.3	4.3	4.5	3.1	3.1	3.1	3.8	4.3	4.8	5	5.1	4.8
Wave energy (kJ)	12	11	9	8	10	22	30	43	48	49	54	69	64	51	44	38	29	25	23	21	21	17	13	9	7	5	4	4	3	2	2	2	2	2	2	2	2	2	2	2	2	2	2	1	1	2	2	2	3	2	3	2	3	3	4	5
Wind speed (km/h)	18.1	18	12.4	16.5	16.1	16.3	10.5	12.4	14.9	14.8	23.6	17.4	11.3	15.8	12.4	5.7	5.5	5.5	12.3	12.5	10.5	8.9	6.5	5.9	4.7	4.4	4.4	6.9	9.8	8.3	6.4	7.2	7.3	9.2	9	13.4	13.5	13.8	9.7	9.3	8.2	7.9	7	7.2	12.8	12.4	12.8	13.3	12.5	10.6	9.4	17.1	17.9	19.8	16.4	13.2
Wind direction	NECross-off	ENECross	ECross	ENECross	ECross	ECross	ECross-on	ESECross-on	SECross-on	ESECross-on	SECross-on	ESECross-on	SSEOnshore	SSEOnshore	SOnshore	SSEOnshore	SOnshore	ESECross-on	ESECross-on	ESECross-on	SECross-on	SEOnshore	ENECross	NECross-off	NNEGlassy	NEGlassy	NEGlassy	SEOnshore	SSEOnshore	SEOnshore	ENECross	NECross-off	NNECross-off	NECross-off	NECross-off	ECross	ECross-on	ECross	ENECross	NECross-off	NECross-off	NECross-off	NECross-off	ECross	ECross	ENECross	ENECross	NECross-off	NECross-off	NECross-off	NECross-off	ENECross	ENECross	ENECross	ENECross	NECross-off

Dadonghai (China, South China Sea) is a well-known beach and surf area near Sanya, Hainan Island, on China’s southern coast. It’s one of the more accessible surf spots in the region and is especially popular with beginners and intermediate surfers thanks to its generally mellow waves and warm tropical water.

Spot overview

Location: Dadonghai Bay, Sanya, Hainan Island, China
Facing: South / southeast exposure to the open South China Sea
Wave type: Mostly beach break
Best for: Beginners, surf lessons, longboarding, and casual fun sessions
Water temperature: Warm year-round; usually boardshorts or a thin rash guard is enough

Wave conditions

Dadonghai tends to produce small to moderate surf, with the best energy often coming from summer typhoon swells and seasonal south/southeast swell windows. On average, it’s not a heavy or powerful wave, but it can offer rideable conditions when the swell lines up.

Good to know

Conditions can be inconsistent, so timing matters.
Because it’s close to a major tourist area, the beach can be busy, especially in peak season.
The spot is generally considered user-friendly rather than advanced, though bigger swells can create more challenging waves.

Best season

The most promising surf period is usually late summer through autumn, when tropical systems and typhoon-generated swell can reach Hainan. Outside of that, surf may be smaller and more variable.