
Surf Forecasts:
Big Bay surf forecast from 8 Aug 2026:
- Best quality surf: Saturday 8 Aug, 8PM (local time) - 11ft (3.5m), 14s period, SW swell with cross-offshore winds.
- Most powerful swell: Saturday 8 Aug, 8PM (local time) - 11ft (3.5m), 14s period, SW swell with 4,803 kJ wave energy.
- Next surfable swell (1★+): Saturday 8 Aug, 8PM (local time) - 11ft (3.5m), 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 Saturday (Aug 08) at 8PM. The primary swell is predicted to be 3.5m and 14s 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 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 1.2m 6s period and expected on Saturday (Aug 15) at 11AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Sat 8th Aug) | 11ft (3.5m) 14s |
| Best Surf | 8PM (Sat 8th Aug) | 11ft (3.5m) 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
Alright, surf’s up. Let’s get into it.
Right off the bat, the water’s feeling proper chilly, a solid few degrees colder than it should be this time of year, so you’ll want the thickest rubber you’ve got. Don’t say I didn’t warn you.
The next week and a half is all about Big Bay. It’s a fairly consistent spot, exposed to the SW swell, and it’s going to be working for a good stretch. The early part of the weekend is a write-off. Saturday afternoon has some lumps of 12ft of swell, but it’s messy with a light cross-onshore and rain. It’s all over the place. The energy is strong (4499), but it’s not a pretty picture.
Sunday’s got the size, but that 25 mph SSE cross-off wind is going to be howling. It’ll be clean, but it’s going to be a battle. That’s not a day for the faint of heart.
Monday eases off a bit to 8-8ft, still with a solid cross-off, but it’s cleaner. Still, I’d be looking past it.
Now, Tuesday is where it starts to get interesting. The wind goes offshore and light, 10 mph from the east. We’ve got 7ft of SSW swell with a 12-second period. The energy is still pushing (1228), but it's cleaner, more organized. This is a proper surfer’s window. Tuesday afternoon lightens up even more, perfect glassy conditions, though the swell backs off a little to 5ft.
But hold on—Wednesday is the standout of this whole forecast. The swell jumps back up to 6-6ft, but the period is a massive 18 seconds. That is a true groundswell. The energy jumps right up (2093 and 2118), and with a light ENE cross-off breeze, the lines are going to be long, clean, and powerful. This is the day to clear your schedule. The combination of size, period, and wind is the best we’re going to see in this run.
Thursday sees the swell swell back up to 8ft, but the period is still 18 seconds. It’s pushing hard (3417), but the wind increases to a 15-20 mph cross-off. It’s going to be big and powerful, but that wind might make it a bit wild. Still a good day for the experienced crew, but not as clean as Wednesday.
Friday drops off a touch and the wind swings to the north, a cross-shore wind that’s going to put a bit of chop on the surface. The magic is starting to fade.
But then we get another beautiful little window. Saturday afternoon the wind goes glassy, completely off, and the swell is a clean 6ft at 14 seconds. That’s a brilliant, low-stress surf. Sunday morning is also looking fine, with a light cross-off and 6ft of swell. These are the days for the longboard or the fish, just enjoying the clean lines.
There’s a bit of a stretch from Sunday afternoon through Wednesday next week that’s messier. The swell hangs around 5ft to 8ft, but the winds get variable and onshore at times. It gets a bit jumbled. The energy drops off, too. That Sunday the 17th has a pulse to 8ft, but with a light onshore wind, it’s not going to be great.
The final day of the period, the 23rd, shows a bit of life again with a SW swell hitting 5ft and a clean cross-off wind. It’s a nice way to finish the run, but it’s not a patch on Wednesday.
So, to cut a long story short: Wednesday the 12th is the one to wait for. That 18-second groundswell is a gift. The secondary window, with cleaner conditions and smaller waves, is Saturday the 15th and Sunday morning the 16th. Don’t bother with this coming weekend; it’s just too messy.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Sat afternoon. Very mild (max 15°C on Sat afternoon, min 10°C on Mon night). Winds increasing (light winds from the WSW on Sat afternoon, strong winds from the SSE by Sun afternoon). | Days 5-7 Weather SummaryMostly dry. Warm (max 24°C on Thu afternoon, min 15°C on Tue night). Mainly fresh winds. | |||||||||||||||||||
Sat 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | ||||||||||||||
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 13 | SW 12 | SSW 12 | SW 11 | SSW 11 | SSW 10 | SSW 14 | SSW 12 | SSW 12 | WSW 21 | WSW 18 | SW 18 | SW 16 | WSW 18 | WSW 16 | WSW 15 | WSW 15 | WSW 14 | WSW 14 |
Wave Graph | ||||||||||||||||||||
4499 | 3759 | 3140 | 3338 | 1807 | 1244 | 1249 | 2119 | 1159 | 671 | 1512 | 1839 | 1974 | 2201 | 3417 | 2262 | 1327 | 1024 | 866 | 1043 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | on | cross |
High Tide | 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 | 4:29PM1.69m | 4:46AM1.51m | |||||||
Low Tide | 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 | 10:16AM-0.00m | 10:45PM0.03m | |||||||
— | — | 7:31 | — | — | 7:30 | — | — | 7:28 | — | — | 7:28 | — | — | 7:26 | — | — | 7:26 | — | — | |
6:10 | — | — | 6:12 | — | — | 6:12 | — | — | 6:13 | — | — | 6:14 | — | — | 6:14 | — | — | 6:15 | — | |
mm | 1 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 13 | 12 | 13 | 12 | 13 | 14 | 11 | 12 | 17 | 16 | 17 | 23 | 23 | 22 | 24 | 23 | 24 | 27 | 17 |
Feels °C | 12 | 11 | 3 | 4 | 4 | 6 | 6 | 6 | 8 | 14 | 13 | 13 | 19 | 19 | 17 | 17 | 19 | 20 | 21 | 15 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 13 | SW 12 | — | SW 11 | SSW 11 | SSW 13 | SSW 14 | SSW 12 | SSW 12 | WSW 21 | WSW 18 | SW 18 | SW 16 | WSW 18 | WSW 16 | WSW 15 | WSW 15 | WSW 14 | WSW 14 |
4499 | 3759 | 3140 | — | 1807 | 1244 | 204 | 2119 | 1159 | 671 | 1512 | 1839 | 1974 | 2201 | 3417 | 2262 | 1327 | 1024 | 866 | 1043 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | WSW 11 | WSW 10 | WSW 24 | S 11 | SSW 10 | SSW 10 | SW 21 | — | — | — | N 7 | NNW 7 | — |
— | — | — | — | — | — | — | 99 | 42 | 224 | 286 | 187 | 116 | 1167 | — | — | — | 45 | 29 | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SW 26 | WSW 10 | WSW 10 | SE 8 | SE 8 | SE 9 | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | 27 | 38 | 18 | 67 | 28 | 22 | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | SSW 12 | — | — | SSW 10 | — | — | — | — | — | — | — | — | — | NNE 7 | — | — | N 3 |
— | — | — | 3338 | — | — | 1249 | — | — | — | — | — | — | — | — | — | 18 | — | — | 4 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 39 | 0 | 340 | 1408 | 0 | 163 | 129 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 2 | 36 | 0 | 25 | 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.











