Surf Forecasts:
Big Wave Bay surf forecast from 13 Aug 2026:
- Most powerful swell: Friday 21 Aug, 2AM (local time) - 4.5ft (1.4m), 7s period, E swell with 173 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 1.4m 7s and forecast to arrive on Friday (Aug 21) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 8s period and expected on Friday (Aug 14) at 8PM.
| Wave Type | Time (HKT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Fri 21st Aug) | 4.5ft (1.4m) 7s |
Table - best surf conditions forecast for Big Wave Bay over the next 16 days.
The Lowdown
Alright, Rusty here again. Let’s talk about what Big Wave Bay has cooking in feet and Fahrenheit.
First off, for the first week it’s pretty dead. Mostly flat, choppy, onshore junk under 3 feet. Water temp is 84°, right about normal for this time of year, nothing to write home about.
The real moment of truth is Friday, August 21st. That morning you’ll see a clean 6ft swell from the ESE with offshore wind out of the NNW at 12 mph. That’s decent shape, combined energy is 484, so it’s got some grunt. Good for a solid session.
But Friday afternoon is the standout: 10ft from the ENE, period of 8 seconds, but the wind goes glassy – just 3 mph from the SW. That’s a rare, clean, heavy wave. Combined energy jumps to 1589, which is strong. That size is for experts only. Expect a crowd, because this spot can get busy.
After that, it falls off the cliff. Saturday the 22nd drops back to small stuff, and the rest of the week into the end of August is just onshore wind and tiny surf. There’s a long-period groundswell on Monday the 24th, 17 seconds from the ESE, but with onshore wind it’s just a choppy mess – not the good kind of long period.
So, your best bet is August 21st. Friday morning for intermediates, Friday afternoon for the experts looking for clean, big waves. After that, it’s back to waiting.
Rusty.
Short Range ForecastHeavy rain (total 20mm), heaviest during Thu night. Warm (max 30°C on Sat morning, min 27°C on Fri morning). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 9mm), mostly falling on Mon morning. Warm (max 30°C on Sun night, min 27°C on Tue night). Wind will be generally light. | ||||||||||||||||||
Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | ||||||||||||||
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) | S 8 | E 9 | E 10 | E 9 | S 8 | SSW 8 | E 11 | E 11 | E 10 | E 10 | E 11 | E 11 | E 11 | E 11 | ESE 3 | E 4 | ENE 4 | E 5 | E 5 |
Wave Graph  | |||||||||||||||||||
 kJ | 0 | 2 | 2 | 2 | 0 | 0 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 6 | 22 | 36 | 25 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | glassy | cross-off | cross | cross | cross-off | cross | cross-off | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross |
High Tide | 11:05PM0.93m | 9:22AM1.83m | 11:27PM1.00m | 10:03AM1.67m | 11:42PM1.09m | 10:36AM1.47m | 11:44PM1.20m | 11:01AM1.26m | 11:39PM1.31m | 11:20AM1.06m | 11:52PM1.41m | 11:39AM0.88m | 00:19AM1.48m | ||||||
Low Tide | 2:43AM0.61m | 4:27PM0.12m | 3:39AM0.56m | 4:56PM0.23m | 4:35AM0.53m | 5:23PM0.35m | 5:31AM0.52m | 5:48PM0.47m | 6:28AM0.52m | 6:11PM0.57m | 7:27AM0.53m | 6:30PM0.66m | |||||||
 |  | | |  | | |  | | | | | | | |  | | |  | |
 | — | 5:58 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — |
 | 6:55 | — | 6:54 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — |
mm | 10 | 5 | 1 | 1 | — | — | 3 | — | — | 1 | 3 | — | 2 | 2 | — | 1 | — | — | — |
Temp °C | 29 | 28 | 29 | 29 | 30 | 30 | 29 | 30 | 30 | 30 | 30 | 30 | 30 | 28 | 29 | 28 | 28 | 29 | 28 |
Feels °C | 32 | 30 | 34 | 34 | 34 | 33 | 32 | 33 | 32 | 34 | 33 | 33 | 35 | 30 | 30 | 30 | 30 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | S 8 | E 9 | — | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 10 | S 9 | S 9 | S 10 | S 9 | S 9 |
| kJ | 127 | 2 | — | 153 | 187 | 196 | 161 | 196 | 210 | 165 | 196 | 205 | 130 | 220 | 202 | 119 | 198 | 171 | 125 |
Swell 2 Height (m) Direction Period (s) | — | — | E 10 | E 9 | — | — | E 11 | E 11 | E 10 | E 10 | E 11 | E 11 | E 11 | E 11 | E 11 | E 11 | E 10 | E 10 | E 10 |
| kJ | — | — | 2 | 2 | — | — | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | S 8 | S 7 | S 7 | — | — | SSW 8 | SSW 8 | — | — | — | — | — | — | — | ESE 3 | E 4 | ENE 4 | E 5 | E 5 |
| kJ | 186 | 131 | 183 | — | — | 277 | 277 | — | — | — | — | — | — | — | 3 | 6 | 22 | 36 | 25 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 581 | 813 | 819 | 40 | 40 | 683 | 40 | 670 | 670 | 40 | 40 | 581 | 161 | 1441 | 581 | 581 | 581 | 656 | 581 |
Best forecast wave conditions in Hong Kong | |||||||||||||||||||
Best forecast wave conditions in China | |||||||||||||||||||
Header Global | |||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Big Wave Bay surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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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