
Surf Forecasts:
Big Bay surf forecast from 7 Aug 2026:
- Best quality surf: Friday 7 Aug, 11AM (local time) - 10ft (3.0m), 14s period, SW swell with offshore winds.
- Most powerful swell: Saturday 8 Aug, 8PM (local time) - 11ft (3.5m), 14s period, SW swell with 4,474 kJ wave energy.
- Next surfable swell (1★+): Friday 7 Aug, 11AM (local time) - 10ft (3.0m), 14s 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 Friday (Aug 07) at 11AM. The primary swell is predicted to be 3.0m and 14s 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 3.5m 14s and forecast to arrive on Saturday (Aug 08) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 6s period and expected on Friday (Aug 14) at 8AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Fri 7th Aug) | 10ft (3.0m) 14s |
| Best Surf | 11AM (Fri 7th Aug) | 10ft (3.0m) 14s |
| Most Powerful | 8PM (Sat 8th Aug) | 11ft (3.5m) 14s |
Table - best surf conditions forecast for Big Bay over the next 16 days.
The Lowdown
G'day, Rusty here. Let's chew the fat on what's coming down the line for the next couple of weeks. It's a story of two halves, really.
We get off to a ripping start Friday morning, August 7th. Big Bay is the only show in town, and it's putting on a proper display. The swell is a solid 10ft from the SW, with a period of 14 seconds – that's proper groundswell, packing a punch with a combined energy of 3673 (moderate to strong). The water temp is sitting at 56°, which is a good 4° colder than usual for this time of year, so you'll be wanting a thicker wetsuit. The wind is light and offshore from the ESE, making the conditions glassy and clean. This is excellent surf, but at 10ft, it's one for the experienced crew only. The sets will be well-spaced with that long period, making the paddle out deceptively easy, but the take-off is serious.
As we move into Friday afternoon, the wind swings to a cross-shore from the SW, and the swell jumps a touch to 12ft, but the quality drops off. The tide might be a factor, and the cross-shore wind will chop it up a bit.
Saturday morning, August 8th, is another standout. The swell drops to a still-very-strong 8ft from the SW (13-second period, 2221 energy), but the wind goes glassy – absolute dead calm from the NNW. That's a rarity and a massive tick for clean, perfect lines. Still a big wave for the big kids, though. By Saturday afternoon, the wind turns onshore, and things get a bit messy.
Sunday, August 9th, is a write-off. The wind is howling out of the SSE at 22 mph, creating a cross-offshore breeze that might look clean on paper but the sheer strength will make it a battle.
The middle of the week, from Monday, August 10th through to Thursday, August 13th, sees the swell settle down to a more manageable 5ft to 8ft, with mostly light winds and clean conditions. Tuesday morning, August 11th, is a beauty with a 6ft SSW swell and offshore E wind at 6 mph. Then Wednesday, August 12th, brings a long-period 18-second swell from the WSW – that's a very long period groundswell. It'll be a bit wonky at a beach break like Big Bay, but the energy is there (2142) and the winds are light.
The first true standout to highlight is Friday morning, August 7th. The combination of a solid 10ft SW groundswell, a 14-second period, and that glassy offshore ESE wind is about as good as it gets for a bigger wave session. The crowd profile at Big Bay is "often," so expect a few out there, but the quality will be worth the company.
The second standout is Thursday morning, August 13th. The swell is a strong 8ft from the WSW with a 17-second period, producing a combined energy of 3192 (strong). The wind is a clean cross-offshore from the NE at 9 mph. It's slightly smaller than Friday, but still a powerful wave for the experienced.
The second week is a bit more mixed. Friday, August 14th, has a glassy afternoon session with a 7ft WSW swell (16 seconds). Saturday, August 15th, is also looking promising with a 8ft swell in the morning and glassy conditions in the afternoon. The swell drops off a bit from Sunday, August 16th, through to Thursday, August 20th, with mostly smaller waves in the 4ft to 6ft range and moderate winds. The energy drops right down into the 500-1000 range (weak to low-moderate).
Then there's a big pulse on the horizon for Friday, August 21st. The swell jumps to 12ft from the WSW, with a 10-second period and a combined energy of 3896 (strong to very strong). The wind is a clean cross-off from the S at 12 mph. This is another big one for experts, but it's a long way out – promising, but less certain. Saturday, August 22nd, looks like a blown-out mess with rain and 25 mph winds, so that big pulse is likely short-lived.
Overall, the first week has the quality, with Friday the 7th and Thursday the 13th being the clear standouts. The second week has a promising but less reliable pulse on the 21st. There's a definite gap in quality from the 16th to the 20th where the swell is small and weaker. Keep your eyes on the forecasts.
Rusty.
Short Range ForecastSome drizzle, heaviest during Sat night. Very mild (max 16°C on Fri afternoon, min 11°C on Fri morning). Winds increasing (calm on Fri afternoon, fresh winds from the SSE by Sun morning). | Days 4-6 Weather SummaryMostly dry. Warm (max 22°C on Wed afternoon, min 10°C on Mon night). Winds decreasing (fresh winds from the SSE on Mon afternoon, calm by Wed afternoon). | ||||||||||||||||||||
Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | |||||||||||||||
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) | SW 14 | SW 14 | SW 14 | SW 13 | SW 14 | SW 13 | SW 12 | SSW 12 | SSW 12 | SW 11 | S 10 | SSW 13 | SSW 12 | SSW 12 | WSW 21 | WSW 18 | WSW 18 | SW 16 | WSW 17 | WSW 16 | WSW 15 |
Wave Graph | |||||||||||||||||||||
3673 | 4370 | 3397 | 2221 | 4262 | 3732 | 2397 | 3128 | 1794 | 676 | 535 | 1877 | 1051 | 660 | 1527 | 1966 | 2138 | 1916 | 3192 | 1904 | 1527 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross | cross-off | glassy | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 9:52AM1.05m | 10:22PM1.20m | 11:32AM1.10m | 11:55PM1.25m | 12:48PM1.23m | 1:05AM1.35m | 1:45PM1.37m | 2:00AM1.45m | 2:32PM1.51m | 2:47AM1.53m | 3:13PM1.62m | 3:29AM1.57m | 3:52PM1.68m | 4:09AM1.56m | |||||||
Low Tide | 3:47PM0.55m | 5:09AM0.43m | 5:37PM0.51m | 6:32AM0.33m | 6:57PM0.39m | 7:32AM0.21m | 7:55PM0.25m | 8:19AM0.10m | 8:44PM0.13m | 9:01AM0.02m | 9:27PM0.05m | 9:40AM-0.01m | 10:07PM0.02m | ||||||||
7:33 | — | — | 7:31 | — | — | 7:31 | — | — | 7:30 | — | — | 7:28 | — | — | 7:28 | — | — | 7:26 | — | — | |
— | 6:09 | — | — | 6:10 | — | — | 6:12 | — | — | 6:12 | — | — | 6:13 | — | — | 6:14 | — | — | 6:14 | — | |
mm | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 16 | 13 | 14 | 15 | 13 | 13 | 13 | 13 | 13 | 14 | 11 | 11 | 18 | 17 | 18 | 22 | 22 | 23 | 27 | 25 |
Feels °C | 11 | 14 | 11 | 13 | 13 | 10 | 4 | 4 | 6 | 6 | 6 | 7 | 8 | 15 | 14 | 15 | 20 | 17 | 18 | 24 | 21 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 14 | SW 14 | SW 13 | SW 14 | SW 13 | SW 12 | — | SSW 12 | SW 11 | SW 11 | SSW 13 | SSW 12 | SSW 12 | WSW 21 | WSW 18 | WSW 18 | SW 16 | WSW 17 | WSW 16 | WSW 15 |
3673 | 4370 | 3397 | 2221 | 4262 | 3732 | 2397 | — | 1794 | 676 | 453 | 1877 | 1051 | 660 | 1527 | 1966 | 2138 | 1916 | 3192 | 1904 | 1527 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | S 13 | — | SSW 13 | WSW 11 | WSW 10 | WSW 24 | SSW 11 | SW 10 | SW 10 | SW 21 | — | NNW 7 | NNW 7 |
— | — | — | — | — | — | — | — | 3 | — | 249 | 66 | 59 | 381 | 297 | 124 | 63 | 1276 | — | 53 | 5 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | SW 26 | WSW 10 | WSW 10 | S 10 | S 10 | SSE 10 | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | 27 | 38 | 19 | 52 | 49 | 19 | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | S 6 | SSW 12 | — | S 9 | S 10 | — | — | — | — | — | — | — | N 6 | — | N 4 |
— | — | — | — | — | — | 218 | 3128 | — | 416 | 535 | — | — | — | — | — | — | — | 21 | — | 12 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 37 | 0 | 0 | 14 | 39 | 994 | 2803 | 0 | 91 | 129 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Cape Town | |||||||||||||||||||||
Best forecast wave conditions in South Africa | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
Latest Updates
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.











