Surf Forecasts:
Big Wave Bay surf forecast from 17 Aug 2026:
- Most powerful swell: Thursday 20 Aug, 5AM (local time) - 4ft (1.2m), 6s period, E swell with 109 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 1.2m 6s and forecast to arrive on Thursday (Aug 20) at 5AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 10s period and expected on Saturday (Aug 22) at 2PM.
| Wave Type | Time (HKT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5AM (Thu 20th Aug) | 4ft (1.2m) 6s |
Table - best surf conditions forecast for Big Wave Bay over the next 16 days.
The Lowdown
G'day, Rusty here. Look, I've had a good hard look at the charts for the next couple of weeks, and I've got to be straight with you: it's a bleak run at Big Wave Bay. The whole 16-day window is basically a write-off for any decent surf. From Monday the 17th right through to Tuesday the 1st of September, every single session is flagged as "poor surf conditions." That's a solid two weeks of nothing worth paddling out for.
The water temp is sitting at a pretty normal 83°F, no surprises there for this time of year. But the swell just isn't showing up. The combined energy of all swells directed here is tiny – mostly single-digit figures, peaking at a measly 120 on the 27th of August afternoon, but even then, the swell height is only 1ft. That's weak energy (120) and not enough to get excited about. The predominant swell direction is from the east or southeast, but the swell periods are all over the place, from a pathetic 3 seconds up to 18 seconds. That long period (18 seconds) on the 25th of August afternoon is a groundswell, but with only 0.3ft of height, it's just a long-period ripple.
The winds are mostly cross-on or cross-shore, adding to the chop. There are a few glassy moments on the 20th of August morning and the 26th of August morning, but with no swell to ride, it's just a flat, clean lake. The place is sheltered and exposed to the northeast, and the optimum swell direction is from the northeast, but the swells we're getting are from the east and southeast, so they're not wrapping in properly.
Honestly, there's nothing to highlight. No standouts, no best on offer. It's a complete blank. For a spot that's fairly consistent, this is a real dud. Sometimes it's just like this, and forecasts can change, but right now, I'd say leave the boards at home. If you're desperate for a water fix, this setup with the tiny swell and cross-shore winds might be more interesting for kite surfing than paddle surfing.
This is Rusty, signing off.
Short Range ForecastLight rain (total 4mm), mostly falling on Mon night. Warm (max 31°C on Mon afternoon, min 28°C on Mon night). Winds decreasing (fresh winds from the ENE on Wed morning, calm by Thu morning). | Days 5-7 Weather SummaryHeavy rain (total 205mm), heaviest during Fri night. Warm (max 31°C on Fri morning, min 26°C on Fri night). Winds increasing (calm on Thu afternoon, strong winds from the WSW by Fri night). | |||||||||||||||||||
Mon 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
PM | 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) | SE 11 | SE 11 | E 3 | E 4 | E 4 | E 5 | E 6 | E 6 | E 6 | ESE 5 | E 6 | E 6 | SE 7 | E 10 | E 10 | E 10 | E 10 | E 11 | E 10 | SE 10 |
Wave Graph | ||||||||||||||||||||
5 | 5 | 6 | 12 | 20 | 67 | 97 | 89 | 36 | 17 | 11 | 7 | 7 | 2 | 2 | 2 | 2 | 2 | 2 | 4 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross | glassy | on | off | cross-off | cross | cross-off | cross-off | cross-off | cross | cross | cross | cross-on |
High Tide | 11:39PM1.31m | 11:20AM1.06m | 11:52PM1.41m | 11:39AM0.88m | 00:19AM1.48m | 12:03PM0.75m | 5:53PM0.73m | 00:55AM1.51m | 12:34PM0.63m | 1:42AM1.51m | 1:15PM0.54m | 2:44AM1.50m | 4:11AM1.52m | |||||||
Low Tide | 5:48PM0.47m | 6:28AM0.52m | 6:11PM0.57m | 7:27AM0.53m | 6:30PM0.66m | 8:33AM0.54m | 2:49PM0.67m | 9:46AM0.54m | 3:01PM0.58m | 11:05AM0.50m | 3:17PM0.51m | 12:20PM0.43m | ||||||||
— | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | |
6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:51 | — | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — | |
mm | — | 3 | 1 | — | — | — | — | — | — | 1 | 7 | 4 | 14 | 147 | 16 | 4 | 6 | 6 | 3 | 4 |
Temp °C | 31 | 30 | 28 | 29 | 28 | 29 | 29 | 28 | 30 | 30 | 29 | 31 | 29 | 27 | 27 | 28 | 28 | 29 | 29 | 28 |
Feels °C | 35 | 35 | 30 | 31 | 31 | 29 | 29 | 30 | 34 | 35 | 34 | 35 | 35 | 27 | 28 | 31 | 32 | 32 | 32 | 32 |
Swell 1 Height (m) Direction Period (s) | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 9 | S 8 | S 9 | S 8 | S 8 | S 8 | S 9 | S 10 | S 10 | S 9 | S 9 | S 9 | S 8 |
108 | 98 | 74 | 86 | 86 | 44 | 48 | 73 | 69 | 119 | 108 | 78 | 44 | 152 | 305 | 262 | 177 | 192 | 190 | 136 | |
Swell 2 Height (m) Direction Period (s) | SE 11 | SE 11 | SE 11 | SE 11 | E 11 | E 10 | S 10 | E 10 | E 6 | ESE 5 | E 6 | E 6 | S 10 | — | E 10 | E 10 | E 10 | E 11 | E 10 | SE 10 |
5 | 5 | 4 | 4 | 2 | 2 | 32 | 2 | 36 | 17 | 11 | 7 | 32 | — | 2 | 2 | 2 | 2 | 2 | 4 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | E 10 | — | ESE 6 | E 6 | — | ENE 6 | SE 7 | E 10 | — | — | — | — | — | — |
— | — | — | — | — | — | 2 | — | 23 | 1 | — | 7 | 7 | 2 | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | E 3 | E 4 | E 4 | E 5 | E 6 | E 6 | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | 6 | 12 | 20 | 67 | 97 | 89 | — | — | — | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 672 | 581 | 581 | 656 | 581 | 581 | 619 | 161 | 6 | 813 | 6 | 6 | 1507 | 40 | 43 | 40 | 822 | 43 | 683 | 619 |
Best forecast wave conditions in Hong Kong | ||||||||||||||||||||
Best forecast wave conditions in China | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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Live Wave Height (m)
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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.











