
Surf Forecasts:
Big Bay surf forecast from 2 Sep 2026:
- Best quality surf: Wednesday 2 Sep, 8PM (local time) - 8ft (2.5m), 13s period, SW swell with cross-offshore winds.
- Most powerful swell: Wednesday 2 Sep, 8PM (local time) - 8ft (2.5m), 13s period, SW swell with 2,241 kJ wave energy.
- Next surfable swell (1★+): Wednesday 2 Sep, 8PM (local time) - 8ft (2.5m), 13s period with SW 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 Wednesday (Sep 02) at 8PM. The primary swell is predicted to be 2.5m and 13s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Big Bay in the next 16 days are 2.5m 13s and forecast to arrive on Wednesday (Sep 02) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Wed 2nd Sep) | 8ft (2.5m) 13s |
| Best Surf | 8PM (Wed 2nd Sep) | 8ft (2.5m) 13s |
| Most Powerful | 8PM (Wed 2nd Sep) | 8ft (2.5m) 13s |
Table - best surf conditions forecast for Big Bay over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's break down what we've got coming our way. We're looking at the one spot, Big Bay, and it's a mixed bag over the next couple of weeks. The water is sitting at 55°, which is a solid 5° colder than normal for this time of year – that's a big, noticeable chill, so you're gonna want a proper wetsuit.
The first real action kicks off on Thursday morning, September 3rd. We've got a clean 5.6ft swell from the WSW with a light cross-offshore breeze from the SE. It's clean, it's got some push, and for experienced surfers, this is a solid window. The combined energy is moderate at 1114, telling you there's enough there to get some work done.
Friday the 4th is a standout for the wind, but it's a double-edged sword. Both the morning and afternoon are seeing strong offshore winds out of the SE, up to 28 mph in the morning. That'll make for some absolutely perfect, glassy faces, but with a 7.5ft to 9.8ft swell from the S and SSE, and short period around 8-9 seconds, it's going to be a real fight to get out. This is big, bumpy, expert territory. The combined energy is massive, hitting 2164 and 1191 – there's a lot of power in the water. If you're not on a gun and don't have the fitness, stay on the beach.
Then we get a real treat. Saturday morning, September 5th, is your best bet. The wind has eased to a moderate 16 mph offshore from the SE, and the swell is a proper 6.9ft from the SSE. The energy is a solid 1191, and it's clean. This is the morning to be out there, no question.
Sunday morning, September 6th, brings something different. We've got a 5.9ft groundswell from the SW with a very long period of 18 seconds (combined energy of 2215). That's a proper, grunty swell. With light offshore E winds, it'll be clean and powerful. Just remember, that long period means long lulls, and at a beach break it might bend a bit too straight. But for the experienced crew, that's a session to look out for.
The second week looks pretty ordinary until Thursday, September 17th. The morning shapes up nicely with a clean 5.2ft SW swell and a light cross-offshore breeze from the SSW. The energy is a moderate 821, and it's clean. That's the only real highlight in the back half, so keep an eye on that date.
As for the rest, there's a lot of onshore wind and chop, or small, weak swells. The afternoons on Tuesday the 8th and Wednesday the 9th are total write-offs. It's a typical shoulder-season pattern where you gotta pick your windows. With that massive offshore wind on Friday the 4th, the setup would honestly look more interesting for a kite surfer than a paddle surfer.
Stay warm, and I'll see you in the water.
Short Range ForecastMostly dry. Very mild (max 18°C on Fri afternoon, min 11°C on Wed night). Winds increasing (calm on Wed night, strong winds from the SSE by Thu afternoon). | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Sun afternoon, min 12°C on Sun night). Wind will be generally light. | |||||||||||||||||||
Wed 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | ||||||||||||||
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) | SW 13 | WSW 13 | WSW 13 | S 9 | SSE 9 | S 9 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SW 21 | SW 18 | SW 16 | SW 15 | SW 14 | SW 13 | SSW 12 | SSW 12 | WSW 15 | WSW 14 |
Wave Graph | ||||||||||||||||||||
2528 | 1573 | 949 | 1645 | 1393 | 866 | 1091 | 561 | 638 | 201 | 1103 | 2065 | 1350 | 1059 | 1138 | 991 | 353 | 280 | 154 | 183 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | cross-off | cross-off | off | off | off | off | off | off | off | on | cross | cross-on | on | cross-on | on | on | cross |
High Tide | 6:19PM1.41m | 6:49AM1.20m | 7:11PM1.27m | 7:57AM1.08m | 8:31PM1.15m | 9:47AM1.03m | 10:28PM1.12m | 11:37AM1.12m | 00:03AM1.20m | 12:46PM1.27m | 1:05AM1.32m | 1:34PM1.43m | 1:53AM1.44m | |||||||
Low Tide | 00:39AM0.29m | 12:46PM0.40m | 1:38AM0.41m | 1:56PM0.53m | 3:14AM0.50m | 3:58PM0.59m | 5:14AM0.47m | 5:54PM0.50m | 6:31AM0.35m | 7:02PM0.34m | 7:23AM0.22m | 7:50PM0.20m | ||||||||
— | — | 7:01 | — | — | 7:01 | — | — | 6:58 | — | — | 6:58 | — | — | 6:56 | — | — | 6:54 | — | — | |
6:28 | — | — | 6:29 | — | — | 6:29 | — | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 6:31 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 14 | 16 | 15 | 15 | 15 | 18 | 14 | 16 | 22 | 18 | 21 | 26 | 18 | 18 | 18 | 15 | 17 | 16 | 14 |
Feels °C | 14 | 13 | 14 | 6 | 7 | 6 | 11 | 9 | 11 | 18 | 15 | 19 | 26 | 17 | 15 | 15 | 15 | 16 | 15 | 14 |
Swell 1 Height (m) Direction Period (s) | SW 13 | WSW 13 | WSW 13 | WSW 12 | WSW 12 | WSW 11 | WSW 11 | WSW 11 | S 9 | SSW 10 | SSE 9 | SW 18 | SW 16 | SW 15 | SW 14 | SW 13 | SSW 12 | SSW 12 | SW 11 | WSW 11 |
2528 | 1573 | 949 | 419 | 242 | 140 | 93 | 66 | 495 | 160 | 295 | 2065 | 1350 | 1059 | 1138 | 991 | 353 | 280 | 119 | 151 | |
Swell 2 Height (m) Direction Period (s) | — | S 10 | S 9 | W 14 | — | — | SW 14 | SSW 13 | WSW 10 | WSW 10 | SW 21 | SSE 10 | S 10 | SSE 7 | SE 7 | SW 21 | WSW 12 | WSW 12 | WSW 12 | WSW 14 |
— | 115 | 165 | 100 | — | — | 7 | 34 | 58 | 40 | 1103 | 150 | 88 | 36 | 11 | 17 | 334 | 150 | 140 | 183 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | WSW 24 | SW 10 | — | — | — | SSE 14 | SW 20 | NW 5 | WSW 16 | WSW 15 | S 10 |
— | — | — | — | — | — | — | — | — | 58 | 25 | — | — | — | 20 | 16 | 7 | 103 | 154 | 29 | |
Wind waves Height (m) Direction Period (s) | — | — | — | S 9 | SSE 9 | S 9 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | — | — | — | NNW 4 | NW 4 | — | NNW 5 | — | — |
— | — | — | 1645 | 1393 | 866 | 1091 | 561 | 638 | 201 | 538 | — | — | — | 12 | 14 | — | 10 | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 930 | 1276 | 1438 | 3874 | 0 | 0 | 0 | 0 | 0 | 34 | 2 | 36 | 29 | 2 | 29 | 29 | 2 |
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.










