Surf Forecasts:
Big Wave Bay surf forecast from 21 Aug 2026:
- Most powerful swell: Tuesday 25 Aug, 2PM (local time) - 1.5ft (0.4m), 18s period, SE swell with 78 kJ wave energy.
Best Forecast Surf Conditions for Big Wave Bay this week:
The most powerful waves expected at Big Wave Bay in the next 16 days are 0.4m 18s and forecast to arrive on Tuesday (Aug 25) at 2PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 9s period and expected on Saturday (Aug 22) at 8AM.
| Wave Type | Time (HKT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2PM (Tue 25th Aug) | 1.5ft (0.4m) 18s |
Table - best surf conditions forecast for Big Wave Bay over the next 16 days.
The Lowdown
Alright folks, let's be honest, the surf outlook for Big Wave Bay is a total bummer. We're looking at a long stretch of nothing, a proper flat spell that’s going to test your patience.
For the first few days, there’s just nothing doing. The wave energy is pathetic, with values in the single digits (2-6) on the 24th. There’s a faint pulse of long-period (14s) east swell that day and the wind is glassy, but at a mere 0.1m, it’s not even a ripple. It’s a classic tease. Then we get a little more energy around the 25th and 26th, but the wind turns onshore and choppy, making a mess of the tiny 0.4m waves. Not worth the drive.
The wind stays ugly for the next few days, blowing cross-shore at 25-35 km/h, just ruining any chance of clean surf. It's all flat and bumpy. This carries us right through the first week.
As we get into the end of August and the start of September, the swell energy does start to build. The models are showing a more significant pulse, with energy jumping into the triple digits (106-126) around the 31st and 1st. But here's the kicker: it's accompanied by a near-gale to strong breeze, all cross-onshore. The ocean will be a complete mess, blown out and lumpy. It might be 1.0m, but it’ll be unsurfable. This looks more like a day for the kite surfers, not us.
The wind might ease up a little on the 3rd and 4th, but the swell is fading and the period is dropping. By the 6th, we are back to square one, with weak energy and more cross-onshore wind.
So, to sum it up: the 16-day window is essentially a write-off. There are no standout days, no silver linings. The only sizeable swell arrives with terrible wind, and the clean days have no waves. That's the deal. This is one of those blank runs that happens. Forecasts can change, so don't throw your boards in the attic just yet, but don't get your hopes up either.
Rusty.
Short Range ForecastHeavy rain (total 42mm), heaviest during Sun night. Warm (max 30°C on Sat afternoon, min 27°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 58mm), heaviest during Tue afternoon. Warm (max 28°C on Wed morning, min 25°C on Tue morning). Winds increasing (calm on Mon night, fresh winds from the ENE by Thu morning). | ||||||||||||||||||
Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||
Wave Height (m) Direction Period (s) | SSW 9 | S 9 | E 11 | E 11 | E 11 | E 11 | E 10 | E 14 | E 14 | SE 14 | ESE 18 | SE 16 | ESE 15 | E 5 | E 5 | E 5 | ENE 4 | ENE 4 | E 11 |
Wave Graph  | |||||||||||||||||||
 kJ | 0 | 0 | 2 | 2 | 2 | 2 | 2 | 4 | 4 | 8 | 31 | 67 | 42 | 47 | 27 | 15 | 23 | 18 | 2 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | glassy | glassy | cross | cross-on | cross-off | cross-off | cross-on | cross-on | cross | cross | cross-on | cross |
High Tide | 1:42AM1.51m | 1:15PM0.54m | 2:44AM1.50m | 4:11AM1.52m | 9:28PM0.88m | 5:59AM1.57m | 9:45PM0.88m | 6:57AM1.64m | 10:03PM0.89m | 7:37AM1.68m | 10:17PM0.92m | ||||||||
Low Tide | 11:05AM0.50m | 3:17PM0.51m | 12:20PM0.43m | 1:14PM0.36m | 10:57PM0.86m | 1:54PM0.29m | 00:07AM0.80m | 2:28PM0.24m | 1:04AM0.73m | 2:59PM0.21m | 1:56AM0.65m | ||||||||
 |  |  | | |  | | | | | |  |  |  | | | | |  | |
 | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — |
 | 6:50 | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:45 | — |
mm | 3 | 5 | — | 3 | 4 | — | 14 | 8 | 5 | 11 | 12 | 25 | 6 | — | — | 3 | 1 | — | 1 |
Temp °C | 29 | 29 | 30 | 29 | 29 | 29 | 28 | 28 | 29 | 27 | 26 | 25 | 27 | 28 | 28 | 27 | 27 | 28 | 28 |
Feels °C | 32 | 33 | 34 | 32 | 33 | 33 | 31 | 34 | 35 | 33 | 29 | 28 | 29 | 29 | 29 | 28 | 27 | 28 | 29 |
Swell 1 Height (m) Direction Period (s) | S 9 | S 9 | S 9 | S 9 | S 9 | S 8 | S 8 | S 8 | S 9 | S 8 | S 9 | S 9 | S 8 | S 10 | S 9 | S 8 | S 10 | S 9 | S 9 |
| kJ | 627 | 544 | 413 | 356 | 297 | 205 | 190 | 205 | 257 | 161 | 320 | 270 | 205 | 307 | 276 | 241 | 307 | 295 | 189 |
Swell 2 Height (m) Direction Period (s) | — | — | E 11 | E 11 | E 11 | E 11 | E 10 | E 10 | E 10 | SE 14 | ESE 18 | SE 16 | ESE 15 | ESE 12 | ESE 12 | SE 10 | E 9 | E 9 | E 11 |
| kJ | — | — | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 8 | 31 | 67 | 42 | 15 | 14 | 4 | 2 | 2 | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | E 14 | E 14 | E 10 | ESE 13 | ENE 3 | ESE 18 | SE 15 | — | SE 10 | — | E 8 | — |
| kJ | — | — | — | — | — | — | — | 4 | 4 | 2 | 17 | 1 | 30 | 9 | — | 4 | — | 1 | — |
Wind waves Height (m) Direction Period (s) | SSW 9 | — | — | SSW 9 | — | SW 3 | — | — | — | — | ENE 3 | — | — | E 5 | E 5 | E 5 | ENE 4 | ENE 4 | ENE 3 |
| kJ | 919 | — | — | 660 | — | 2 | — | — | — | — | 3 | — | — | 47 | 27 | 15 | 23 | 18 | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 43 | 1921 | 683 | 40 | 40 | 40 | 6 | 6 | 6 | 6 | 820 | 40 | 5 | 581 | 581 | 161 | 670 | 581 | 161 |
Best forecast wave conditions in Hong Kong | |||||||||||||||||||
Best forecast wave conditions in China | |||||||||||||||||||
Header Global | |||||||||||||||||||
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Information about the Big Wave Bay Surf forecast
The above surf forecast table for Big Wave Bay provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Big Wave Bay can be found by selecting the local surf guide option on the grey menu. Our Big Wave Bay 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 (Big Wave Bay) 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 Big Wave Bay 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 Hong Kong? If you are looking for accommodation near Big Wave Bay, camping, hotels and holiday cottages in Hong Kong, consider staying in Hong Kong which is 9 km (6 miles) away. Other places in and around Hong Kong where you can find information about places to rent, and car hire include Aberdeen which is 10 km (6 miles) away, Kowloon, Shenzhen and Yantian.
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