Surf Forecasts:
Big Bay surf forecast from 23 Aug 2026:
- Best quality surf: Sunday 23 Aug, 8AM (local time) - 7.5ft (2.3m), 13s period, WSW swell with offshore winds.
- Most powerful swell: Tuesday 25 Aug, 5AM (local time) - 8ft (2.5m), 14s period, SW swell with 2,471 kJ wave energy.
- Next surfable swell (1★+): Sunday 23 Aug, 8AM (local time) - 7.5ft (2.3m), 13s period with WSW swell.
Best Forecast Surf Conditions for Big Bay this week:
The surf forecast for Big Bay over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Aug 23) at 8AM. The primary swell is predicted to be 2.3m and 13s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Big Bay in the next 16 days are 2.5m 14s and forecast to arrive on Tuesday (Aug 25) at 5AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Tuesday (Aug 25) at 2PM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Sun 23rd Aug) | 7.5ft (2.3m) 13s |
| Best Surf | 8AM (Sun 23rd Aug) | 7.5ft (2.3m) 13s |
| Most Powerful | 5AM (Tue 25th Aug) | 8ft (2.5m) 14s |
Table - best surf conditions forecast for Big Bay over the next 16 days.
The Lowdown
Alright, Rusty here. Let's talk about what's coming up in the water.
The first week is a bit of a mixed bag, but there's some real quality to be found if you're willing to pick your moments. We start off on Sunday the 23rd of August with a solid 7ft swell from the west-southwest, bringing a ton of energy. The wind is light and cross-off, so the lines are going to be clean. The water is currently sitting at 55°, which is a whopping 5° colder than normal for this time of year, so you'll want a good, thick hood. This is excellent surf, but it's a bit too big for beginners and best left to the experienced crew. Monday morning, the 24th, drops to 6ft out of the southwest, still holding good energy and staying clean. Tuesday the 25th brings a pulse back up to 7ft, this time with a really long 14-second period from the southwest, which is proper groundswell. The energy jumps, but the wind picks up to a side-off. It’s still clean, but the longer period might make it a bit walled-off at this exposed spot.
The clear standout is Wednesday the 26th of August. The swell drops slightly to 4ft, but it's coming from the west-southwest with a 13-second period under a glassy offshore breeze. That’s a major positive. The energy is still solid, and the conditions are described as "gentle offshore and clean" – that’s the kind of morning you get out of bed for. It’s not the biggest of the week, but the quality is going to be there.
From Thursday the 27th through to the 31st, the wind gets messy. We get a strong northwesterly breeze that puts a real chop on the surface, and the quality drops right off. The swell hangs around the 4ft to 6ft mark, but the cross-onshore wind makes it a write-off for a few days. It’s a bit of a dry spell.
Then we get a real long-range promise. On Tuesday the 1st of September, the bottom drops out and the wind turns back offshore. A serious 10ft swell from the southwest with a 13-second period hits, and the energy is massive. The wind is a gentle offshore, which is going to make for some incredible, big, clean waves. This is definitely for the experts only, as it’s way over 8ft. It’s a long way off, but keep an eye on this one.
The week after that looks windy and choppy again with a lot of cross-onshore wind, so that Tuesday morning is the one to circle.
Rusty, signing off.
Short Range ForecastMostly dry. Very mild (max 19°C on Tue afternoon, min 12°C on Sun morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 25°C on Wed afternoon, min 13°C on Wed morning). Wind will be generally light. | ||||||||||||||||||||
Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | |||||||||||||||
AM | 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) | WSW 13 | WSW 12 | WSW 12 | SW 12 | WSW 11 | SW 14 | SW 14 | WSW 14 | WSW 13 | WSW 13 | WSW 12 | SSW 11 | SSW 11 | SSW 11 | S 11 | S 11 | WSW 14 | WSW 14 | WSW 14 | WSW 14 | WSW 13 |
Wave Graph | |||||||||||||||||||||
1606 | 1532 | 1236 | 913 | 376 | 2423 | 1922 | 1638 | 1045 | 587 | 466 | 495 | 540 | 394 | 351 | 279 | 534 | 633 | 613 | 693 | 744 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | cross-off | cross-off | cross-on | on | glassy | cross-off | cross-off | cross-off | cross-on | cross-on | cross-on |
High Tide | 12:58PM1.07m | 1:01AM1.13m | 1:36PM1.19m | 1:40AM1.24m | 2:08PM1.31m | 2:13AM1.33m | 2:36PM1.42m | 2:44AM1.41m | 3:04PM1.52m | 3:14AM1.47m | 3:32PM1.59m | 3:44AM1.50m | 4:01PM1.63m | 4:16AM1.50m | |||||||
Low Tide | 7:07PM0.56m | 7:27AM0.41m | 7:45PM0.45m | 7:59AM0.30m | 8:17PM0.34m | 8:27AM0.21m | 8:46PM0.24m | 8:54AM0.14m | 9:15PM0.16m | 9:21AM0.09m | 9:44PM0.10m | 9:49AM0.07m | 10:14PM0.07m | ||||||||
7:16 | — | — | 7:15 | — | — | 7:13 | — | — | 7:11 | — | — | 7:11 | — | — | 7:09 | — | — | 7:09 | — | — | |
— | 6:21 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:23 | — | — | 6:24 | — | — | 6:24 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 5 |
Temp °C | 14 | 16 | 13 | 15 | 18 | 13 | 16 | 19 | 16 | 18 | 25 | 22 | 21 | 18 | 16 | 21 | 24 | 23 | 23 | 19 | 15 |
Feels °C | 12 | 14 | 11 | 12 | 15 | 10 | 12 | 14 | 12 | 15 | 23 | 20 | 19 | 16 | 15 | 18 | 20 | 20 | 15 | 12 | 9 |
Swell 1 Height (m) Direction Period (s) | WSW 13 | WSW 12 | WSW 12 | SW 12 | WSW 11 | SW 14 | SW 14 | WSW 14 | S 8 | WSW 13 | S 11 | SSW 11 | SSW 11 | SSW 11 | S 11 | S 11 | WSW 14 | WSW 14 | WSW 14 | WSW 14 | WSW 13 |
1606 | 1532 | 1236 | 913 | 376 | 2423 | 1922 | 1638 | 368 | 587 | 396 | 495 | 540 | 394 | 351 | 279 | 534 | 633 | 613 | 693 | 744 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | SSW 13 | SW 10 | W 11 | — | SW 15 | WSW 13 | S 8 | WSW 12 | WSW 12 | WSW 12 | WSW 11 | WSW 11 | WSW 11 | S 11 | S 10 | S 11 | S 11 | NW 6 |
— | — | — | 70 | 270 | 151 | — | 109 | 1045 | 169 | 466 | 210 | 183 | 130 | 126 | 93 | 269 | 131 | 79 | 58 | 20 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | SW 14 | — | — | — | SSW 13 | SSW 11 | SSW 16 | SSW 15 | — | SSW 14 | WSW 15 | WSW 16 | — | SSE 5 | — | — | S 10 |
— | — | — | — | 203 | — | — | — | 70 | 200 | 280 | 123 | — | 69 | 86 | 229 | — | 8 | — | — | 18 | |
Wind waves Height (m) Direction Period (s) | — | — | — | SSE 4 | S 4 | SSE 5 | S 6 | S 6 | SSE 7 | — | — | — | — | NW 3 | — | — | SSE 3 | — | NNW 4 | NNW 5 | — |
— | — | — | 16 | 31 | 59 | 146 | 251 | 542 | — | — | — | — | 1 | — | — | 2 | — | 38 | 97 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 52 | 0 | 0 | 400 | 0 | 0 | 0 | 0 | 29 | 29 | 0 | 0 | 0 | 0 | 95 | 192 | 342 |
Best forecast wave conditions in Cape Town | |||||||||||||||||||||
Best forecast wave conditions in South Africa | |||||||||||||||||||||
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Information about the Big Bay Surf forecast
The above surf forecast table for Big 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 Bay can be found by selecting the local surf guide option on the grey menu. Our Big 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 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 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.
Big Bay is 8 km (5 miles) from the very large city of Robben Island. If you plan a holiday in Cape Town, look for hotels and other accommodation in Robben Island. Robben Island has rooms for a wide range of budgets as well as cheap car hire and transport links.











