
Surf Forecasts:
Big Bay surf forecast from 11 Aug 2026:
- Best quality surf: Thursday 13 Aug, 5AM (local time) - 5ft (1.6m), 20s period, SW swell with offshore winds.
- Most powerful swell: Thursday 13 Aug, 11AM (local time) - 7ft (2.2m), 17s period, WSW swell with 2,998 kJ wave energy.
- Next surfable swell (1★+): Tuesday 11 Aug, 8PM (local time) - 3ft (0.9m), 23s 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 Tuesday (Aug 11) at 8PM. The primary swell is predicted to be 0.9m and 23s period with a secondary swell of 1.2m and 11s. Another secondary swell of 1.0m and 9s is also forecast. 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 2.2m 17s and forecast to arrive on Thursday (Aug 13) at 11AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Thursday (Aug 13) at 2AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Tue 11th Aug) | 3ft (0.9m) 23s |
| Best Surf | 5AM (Thu 13th Aug) | 5ft (1.6m) 20s |
| Most Powerful | 11AM (Thu 13th Aug) | 7ft (2.2m) 17s |
Table - best surf conditions forecast for Big Bay over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let's talk about what's coming up at Big Bay.
We've got a solid run of swell ahead, but it's not all smooth sailing. The water is sitting at 56°, which is a whopping 4° colder than normal for this time of year, so you'll be wanting a decent wetsuit. The action kicks off from Tuesday the 11th, with some proper SW groundswell rolling in. The combined energy is pumping at a solid 1381, which is a good sign of moderate to strong energy.
Tuesday afternoon is a ripper to start. We're seeing 5ft of SSW swell with a 12-second period, and the wind is a light offshore from the ESE. That's a recipe for clean, lined-up waves. It's a bit of a heavy one though, with that swell size and period pushing it into experienced surfer territory, so leave the foam boards at home.
Wednesday the 12th keeps the quality high. Morning has 6ft of SW swell with a long 18-second period, and a cross-off wind. That long period will really wrap into the bay, giving you some proper grunt. The afternoon cleans up even more with a light offshore from the ESE again, holding the 6ft SW swell perfectly. This is the standout of the first week.
Thursday the 13th sees the swell bump up to 7ft from the WSW, but the conditions get tricky. The morning is cross-off, but the afternoon turns to an onshore wind from the west, messing up the surface. Friday the 14th is a write-off with cross-onshore winds messing up the 6ft swell.
Now, hold onto your boards for Saturday the 15th morning. It goes completely glassy with a clean 6ft WSW swell. Zero wind, chest-to-head-high waves, and absolutely clean. That is a serious window of opportunity.
The pattern gets a bit sloppy from Sunday the 16th through to Tuesday the 18th. The swell stays in the 6ft to 8ft range, but we've got a mix of cross-onshore and onshore winds that'll make it choppy and less inviting. The energy dips a bit too.
We see a pulse of bigger swell on Wednesday the 19th, with 10ft of SW swell in the afternoon. That's a serious amount of water, and only for the experts. The wind is cross-off, so it'll be clean, but the size is intimidating.
The last few days of the forecast window, from the 22nd to the 26th, look like a return to form. Saturday the 22nd afternoon has 7ft of SW swell with a clean cross-off wind. Sunday the 23rd is a gem with a gentle offshore wind and 6ft of WSW swell. And Monday the 24th morning, with a slight offshore and 7ft of SW swell, is looking like another prime pick. The energy is strong right through to the end.
The best of the best? Lock in Saturday the 15th morning for the glassy conditions, or Sunday the 23rd for that long, clean, offshore session. For the pure power, Wednesday the 19th is for the big-wave crew only.
Rusty, signing off.
Short Range ForecastMostly dry. Warm (max 25°C on Thu afternoon, min 13°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 17°C on Fri afternoon, min 12°C on Fri night). Wind will be generally light. | |||||||||||||||||||
Tue 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | ||||||||||||||
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) | SSW 12 | SW 21 | SW 18 | SW 18 | SW 16 | WSW 17 | WSW 16 | WSW 16 | WSW 15 | WSW 14 | WSW 14 | WSW 14 | WSW 13 | WSW 14 | WSW 14 | WSW 14 | WSW 13 | WSW 13 | WSW 13 | WSW 12 |
Wave Graph | ||||||||||||||||||||
730 | 1850 | 1922 | 1952 | 1916 | 2998 | 2343 | 1743 | 1358 | 1257 | 1179 | 1179 | 1127 | 1179 | 1111 | 1538 | 2477 | 2026 | 1673 | 1236 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | cross-off | off | off | cross-off | on | cross | cross-on | cross-on | cross | glassy | cross | glassy | cross-on | cross-on | glassy | cross-on | on | cross-on |
High Tide | 2:32PM1.51m | 2:47AM1.53m | 3:13PM1.62m | 3:29AM1.57m | 3:52PM1.68m | 4:09AM1.56m | 4:29PM1.69m | 4:46AM1.51m | 5:05PM1.64m | 5:22AM1.43m | 5:39PM1.55m | 5:57AM1.33m | 6:13PM1.43m | |||||||
Low Tide | 8:44PM0.13m | 9:01AM0.02m | 9:27PM0.05m | 9:40AM-0.01m | 10:07PM0.02m | 10:16AM-0.00m | 10:45PM0.03m | 10:51AM0.05m | 11:22PM0.09m | 11:24AM0.14m | 11:57PM0.19m | 11:57AM0.25m | 00:31AM0.30m | |||||||
— | — | 7:28 | — | — | 7:26 | — | — | 7:26 | — | — | 7:24 | — | — | 7:24 | — | — | 7:22 | — | — | |
6:13 | — | — | 6:14 | — | — | 6:14 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 17 | 17 | 15 | 21 | 20 | 21 | 25 | 19 | 19 | 17 | 14 | 14 | 17 | 15 | 15 | 16 | 15 | 16 | 17 | 15 |
Feels °C | 14 | 14 | 11 | 18 | 16 | 17 | 19 | 17 | 15 | 13 | 13 | 14 | 16 | 14 | 13 | 14 | 15 | 13 | 14 | 13 |
Swell 1 Height (m) Direction Period (s) | SSW 12 | SW 21 | SW 18 | SW 18 | SW 16 | WSW 17 | WSW 16 | WSW 16 | WSW 15 | WSW 14 | WSW 14 | WSW 14 | WSW 13 | WSW 14 | WSW 14 | WSW 14 | WSW 13 | WSW 13 | WSW 13 | WSW 12 |
730 | 1850 | 1922 | 1952 | 1916 | 2998 | 2343 | 1743 | 1358 | 1257 | 1179 | 1179 | 1127 | 1179 | 1111 | 1538 | 2477 | 2026 | 1673 | 1236 | |
Swell 2 Height (m) Direction Period (s) | WSW 24 | S 11 | SSW 10 | SSW 10 | SW 21 | — | — | — | — | — | W 5 | W 6 | W 6 | — | — | — | — | — | — | — |
384 | 396 | 187 | 116 | 898 | — | — | — | — | — | 27 | 21 | 22 | — | — | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | SW 10 | SSW 11 | SW 10 | SW 10 | S 10 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
25 | 211 | 87 | 65 | 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | SSE 8 | — | — | — | ESE 3 | — | NNW 6 | — | NNW 4 | NW 4 | — | — | — | — | — | — | — | — | — | — |
242 | — | — | — | 6 | — | 23 | — | 12 | 15 | — | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 4 | 14 | 2 | 4 | 4 | 2 | 0 | 14 | 0 | 29 | 14 | 0 | 4 | 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.











