
Surf Forecasts:
Big Bay surf forecast from 10 Sep 2026:
- Best quality surf: Saturday 12 Sep, 8PM (local time) - 8ft (2.4m), 16s period, SW swell with offshore winds.
- Most powerful swell: Wednesday 16 Sep, 8AM (local time) - 11ft (3.5m), 14s period, SW swell with 4,968 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 8AM (local time) - 6ft (1.8m), 12s 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 Friday (Sep 11) at 8AM. The primary swell is predicted to be 1.8m and 12s period with a secondary swell of 1.6m and 7s. Another secondary swell of 1.8m and 7s is also forecast. 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 Wednesday (Sep 16) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Wednesday (Sep 16) at 8AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Fri 11th Sep) | 6ft (1.8m) 12s |
| Best Surf | 8PM (Sat 12th Sep) | 8ft (2.4m) 16s |
| Most Powerful | 8AM (Wed 16th Sep) | 11ft (3.5m) 14s |
Table - best surf conditions forecast for Big Bay over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what’s comin’ down the line.
Alright, so the next couple of weeks are bringin’ a solid run of SW swell to Big Bay, but you gotta pick your moments. The water’s sittin’ at 57°, which is about 3° colder than normal for this time of year – that’s a bit of a bite, so don’t be shy with the rubber.
Thursday the 10th and Friday the 11th are a bit of a tease: clean wave faces from a cross-off breeze, but the reports are callin’ it marginal, so nothin’ to get too excited about. Saturday the 12th afternoon pumps a bit more size with 8ft from the SW, and that combined wave energy jumps to 3411 – solid, moderate to strong stuff. Still, that cross-off wind keeps it from bein’ perfect.
Now, Sunday the 13th morning is where it starts to get real. You’ve got 6ft of SW groundswell with a 14-second period, a light offshore breeze, and the wave energy’s at 1491. Conditions are callin’ excellent for experienced surfers, so if you’ve got the chops, that’s your window. Crowds are likely here, which is no surprise for a spot that can handle this kind of direction.
We hit a rough patch Monday the 14th through Tuesday the 15th. Strong cross-onshore winds and choppy, lumpy conditions make it a write-off – not worth paddlin' out. If you’re into kites, the setup on Tuesday afternoon with 6ft and a fresh cross-onshore might be more your speed.
Wednesday the 16th sees a return of clean conditions with a stiff cross-off breeze, and the swell builds to 12ft in the afternoon – that’s big and gnarly, combined energy over 3874, definitely expert-only territory. The short 13-second period on that size will make it a handful at a beach setup like this.
A nice little window opens Thursday the 17th morning: glassy light offshore, 5ft SW swell, clean lines, and very good conditions. The energy is moderate at 906, but the quality should be there. That holds into Friday the 18th morning with similar vibes, though smaller.
The standout for the whole outlook? Saturday the 19th. Glassy conditions in the morning with 7ft of WSW groundswell at a long 16 seconds – combined energy of 1959. That’s strong, clean, and experienced-level fun all morning. The offshore wind in the afternoon keeps it tidy, too. If you can only paddle out one day, that’s the one.
Sunday the 20th gets bigger again, 8ft to 10ft, but the wind picks up fresh, so it’s less appealing. Monday the 21st though, offers another quality session: clean, moderate offshore wind, with 7ft SW at 14 seconds – energy at 2905. Excellent again for the experienced crew.
After that, the surf drops off through the end of the week into the 25th, with smaller, clean but lower-energy days. The final spark is on Friday the 25th afternoon: a glassy, light wind session with 4ft SW swell and a 13-second period, but the energy jumps back up to 1195 – promising for a little late-season reward. Just watch for those rain showers.
Summin’ it up: Sunday 13th morning and Saturday 19th are your best bets for quality, clean waves. Don’t sleep on Thursday 17th either. The rest is either too windy, too big, or just not quite there.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Fri afternoon, min 14°C on Thu morning). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 26mm), heaviest during Mon morning. Warm (max 24°C on Sun afternoon, min 13°C on Tue night). Winds increasing (calm on Sun night, strong winds from the NW by Tue afternoon). | ||||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | |||||||||||||||
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 15 | WSW 13 | WSW 13 | WSW 12 | WSW 12 | WSW 12 | SW 14 | SW 17 | SW 15 | SW 14 | SW 14 | SW 13 | SW 12 | SW 12 | SW 12 | SW 19 | SW 17 | WSW 15 | SW 14 | SW 13 | SW 12 |
Wave Graph | |||||||||||||||||||||
2328 | 1672 | 1321 | 830 | 680 | 414 | 1500 | 3134 | 2178 | 1403 | 947 | 673 | 430 | 349 | 254 | 380 | 1677 | 4580 | 2066 | 3874 | 1602 | |
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 | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-off | cross-off | cross-off | cross-off |
High Tide | 2:51PM1.66m | 3:10AM1.55m | 3:25PM1.70m | 3:44AM1.55m | 3:58PM1.68m | 4:17AM1.52m | 4:29PM1.62m | 4:48AM1.45m | 4:59PM1.52m | 5:18AM1.35m | 5:29PM1.40m | 5:49AM1.24m | 6:00PM1.27m | ||||||||
Low Tide | 8:41AM0.05m | 9:08PM0.01m | 9:15AM0.02m | 9:42PM-0.01m | 9:48AM0.03m | 10:15PM0.01m | 10:19AM0.08m | 10:45PM0.07m | 10:49AM0.16m | 11:15PM0.17m | 11:18AM0.26m | 11:44PM0.28m | 11:48AM0.38m | 00:15AM0.41m | |||||||
6:52 | — | — | 6:50 | — | — | 6:50 | — | — | 6:48 | — | — | 6:47 | — | — | 6:46 | — | — | 6:43 | — | — | |
— | 6:32 | — | — | 6:34 | — | — | 6:35 | — | — | 6:36 | — | — | 6:36 | — | — | 6:37 | — | — | 6:37 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | 3 | 12 | — | — | — | — | 11 | — | — | — |
Temp °C | 17 | 18 | 15 | 17 | 21 | 17 | 18 | 18 | 16 | 21 | 24 | 19 | 16 | 19 | 15 | 17 | 17 | 15 | 15 | 15 | 14 |
Feels °C | 15 | 15 | 12 | 14 | 18 | 14 | 16 | 15 | 13 | 20 | 22 | 20 | 12 | 14 | 10 | 11 | 10 | 9 | 6 | 6 | 8 |
Swell 1 Height (m) Direction Period (s) | SW 15 | WSW 13 | WSW 13 | WSW 12 | WSW 12 | S 8 | SW 14 | SW 17 | SW 15 | SW 14 | SW 14 | SW 13 | SW 12 | SW 12 | SW 12 | SW 12 | SW 17 | WSW 15 | SW 14 | SW 13 | SW 12 |
2328 | 1672 | 1321 | 830 | 680 | 253 | 1500 | 3134 | 2178 | 1403 | 947 | 673 | 430 | 349 | 254 | 293 | 1677 | 4580 | 2066 | 3874 | 1602 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | S 7 | — | WSW 12 | S 8 | — | SSE 8 | S 7 | S 7 | S 7 | SSE 7 | — | SE 9 | SW 19 | — | — | SW 9 | — | W 13 |
— | — | — | 238 | — | 414 | 219 | — | 130 | 88 | 62 | 35 | 19 | — | 3 | 380 | — | — | 808 | — | 171 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | SSW 10 | — | — | — | — | — | — | — | — | S 13 | — | — | — | — | — | — |
— | — | — | — | — | 57 | — | — | — | — | — | — | — | — | 3 | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | S 4 | S 6 | SSE 7 | S 7 | SSE 7 | SSE 7 | SSE 8 | SSE 8 | — | — | NNW 3 | NW 6 | NW 6 | NNW 8 | NW 8 | NW 5 | — | S 7 | — | SE 4 |
— | 19 | 91 | 299 | 333 | 353 | 198 | 277 | 339 | — | — | 4 | 80 | 154 | 287 | 138 | 96 | — | 312 | — | 17 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 39 | 39 | 0 | 0 | 14 | 0 | 0 | 940 | 0 | 0 | 13 | 29 | 185 | 34 | 79 | 192 | 232 | 0 | 340 | 52 | 0 |
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.










