Surf Forecasts:
Big Bay surf forecast from 22 Aug 2026:
- Best quality surf: Saturday 22 Aug, 11PM (local time) - 6.5ft (2.0m), 10s period, SW swell with glassy winds.
- Most powerful swell: Tuesday 25 Aug, 2PM (local time) - 7ft (2.2m), 14s period, SW swell with 1,922 kJ wave energy.
- Next surfable swell (1★+): Saturday 22 Aug, 8PM (local time) - 6ft (1.8m), 11s 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 22) at 8PM. The primary swell is predicted to be 1.8m and 11s period with a secondary swell of 0.4m and 16s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Big Bay in the next 16 days are 2.2m 14s and forecast to arrive on Tuesday (Aug 25) at 2PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Tuesday (Aug 25) at 2AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Sat 22nd Aug) | 6ft (1.8m) 11s |
| Best Surf | 11PM (Sat 22nd Aug) | 6.5ft (2.0m) 10s |
| Most Powerful | 2PM (Tue 25th Aug) | 7ft (2.2m) 14s |
Table - best surf conditions forecast for Big Bay over the next 16 days.
The Lowdown
G’day, I’m Rusty. Let’s have a look at what’s coming up for Big Bay.
The next couple of days are a bit of a write-off, but once we get into Sunday morning (August 23), things start to get interesting. The water temperature is sitting at 55°F, which is a solid 5°F colder than usual for this time of year – that’s a notable chill, so a decent wetsuit is a must.
Sunday morning (August 23) is the first real standout. We’ve got a solid 8ft swell rolling in from the WSW, with a period of 13 seconds – that’s a proper groundswell with plenty of energy (combined energy of 1674). The wind is light and cross-off from the SSE, so the face will be clean and well-shaped. This is excellent surf for experienced surfers.
Monday morning (August 24) still offers a decent 6ft WSW swell with a 12-second period, but the wind picks up to a gentle breeze, still cross-off, so it’s clean but not as pristine. The energy drops a bit (980).
Tuesday (August 25) sees a jump in size – 7ft SW swell with a 14-second period, and the combined energy is strong (1868 and 2049). The wind is a moderate cross-off from the SSE, so it’s clean but with a bit of push. This is solid for those who know what they’re doing.
Wednesday (August 26) is a good call for the morning – 4ft WSW swell, 13-second period, light offshore from the ESE, and gentle conditions. It’s clean, with a combined energy of 918. A nice, mellow session.
Thursday (August 27) is a bit of a dud – small swell, cross-on wind, not much to get excited about. Friday (August 28) brings a sweet little window: 4ft WSW groundswell with a 14-second period, and light offshore wind from the ESE. The energy is 890, and the conditions are clean. A good one for a morning paddle.
Saturday (August 29) is blown out – moderate cross-on wind, choppy, and not worth the effort. Sunday (August 30) sees a massive 16ft swell from the WSW, but that’s way too big for this break – it’s really only for the experts, and even then, it’s pushing it.
Monday (August 31) returns to a more manageable 7ft WSW swell with a 11-second period, cross-off wind, and clean conditions. Tuesday (September 1) is a standout – 8ft SW swell, 13-second period, light offshore from the ESE, and a combined energy of 2376. Excellent conditions for experienced surfers.
The rest of the forecast is a mixed bag of big swells and strong winds, with a few promising windows. The September 5 afternoon has a 8ft SW swell with a massive 21-second period (combined energy of 9130), but that long period will make it break a bit straight at beach breaks – still, energy is huge. The September 6 is just too big for most.
Overall, the best on offer is Sunday morning (August 23) and Tuesday (September 1). Both offer solid, clean groundswell with favourable winds.
Rusty
Short Range ForecastMostly dry. Very mild (max 17°C on Mon afternoon, min 12°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 25°C on Wed afternoon, min 12°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Sat 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | ||||||||||||||
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 12 | SW 10 | WSW 13 | WSW 12 | WSW 12 | SW 12 | WSW 11 | SW 15 | SW 14 | SW 14 | WSW 13 | WSW 13 | WSW 12 | S 11 | SSW 11 | SSW 11 | S 11 | WSW 16 | WSW 14 | WSW 15 |
Wave Graph | ||||||||||||||||||||
479 | 707 | 1674 | 1532 | 1236 | 913 | 370 | 1108 | 1868 | 1824 | 1002 | 578 | 458 | 345 | 370 | 308 | 291 | 310 | 668 | 811 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | cross-off | cross-off | cross-on | on | cross-off | off | off | cross-off |
High Tide | 00:06AM1.04m | 12:58PM1.07m | 1:01AM1.13m | 1:36PM1.19m | 1:40AM1.24m | 2:08PM1.31m | 2:13AM1.33m | 2:36PM1.42m | 2:44AM1.41m | 3:04PM1.52m | 3:14AM1.47m | 3:32PM1.59m | 3:44AM1.50m | |||||||
Low Tide | 6:08PM0.66m | 6:46AM0.52m | 7:07PM0.56m | 7:27AM0.41m | 7:45PM0.45m | 7:59AM0.30m | 8:17PM0.34m | 8:27AM0.21m | 8:46PM0.24m | 8:54AM0.14m | 9:15PM0.16m | 9:21AM0.09m | 9:44PM0.10m | |||||||
— | — | 7:16 | — | — | 7:15 | — | — | 7:13 | — | — | 7:11 | — | — | 7:11 | — | — | 7:09 | — | — | |
6:21 | — | — | 6:21 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:23 | — | — | 6:24 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 15 | 14 | 16 | 13 | 15 | 17 | 13 | 16 | 20 | 16 | 18 | 25 | 22 | 21 | 19 | 17 | 24 | 31 | 27 |
Feels °C | 12 | 16 | 13 | 14 | 11 | 12 | 13 | 10 | 12 | 16 | 12 | 15 | 23 | 20 | 18 | 17 | 16 | 21 | 28 | 24 |
Swell 1 Height (m) Direction Period (s) | SW 12 | SW 10 | WSW 13 | WSW 12 | WSW 12 | SW 12 | WSW 11 | SW 15 | SW 14 | SW 14 | WSW 13 | WSW 13 | S 11 | S 11 | SSW 11 | SSW 11 | S 11 | S 11 | WSW 14 | WSW 15 |
479 | 707 | 1674 | 1532 | 1236 | 913 | 370 | 1108 | 1868 | 1824 | 1002 | 578 | 403 | 345 | 370 | 308 | 291 | 223 | 668 | 811 | |
Swell 2 Height (m) Direction Period (s) | WSW 10 | WSW 14 | — | — | — | SSW 13 | SSW 10 | WSW 11 | — | — | S 7 | S 8 | WSW 12 | WSW 12 | WSW 12 | WSW 11 | WSW 11 | WSW 16 | S 10 | S 10 |
94 | 501 | — | — | — | 67 | 182 | 249 | — | — | 239 | 140 | 458 | 274 | 242 | 183 | 126 | 310 | 208 | 98 | |
Swell 3 Height (m) Direction Period (s) | WSW 17 | SSW 12 | — | — | — | — | SW 14 | SW 10 | — | — | SSW 15 | SSW 11 | SSW 15 | SSW 15 | SW 18 | WSW 16 | WSW 15 | WSW 14 | SSE 5 | SSE 13 |
27 | 136 | — | — | — | — | 160 | 139 | — | — | 125 | 200 | 88 | 125 | 13 | 27 | 150 | 168 | 14 | 34 | |
Wind waves Height (m) Direction Period (s) | N 3 | — | — | — | — | SSE 4 | S 5 | S 6 | SSE 6 | S 6 | SE 7 | — | — | — | N 3 | NW 3 | — | SSE 3 | — | NNW 4 |
1 | — | — | — | — | 11 | 42 | 133 | 117 | 225 | 192 | — | — | — | 1 | 1 | — | 2 | — | 15 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 29 | 0 | 0 | 0 | 0 | 0 | 34 | 0 | 0 | 400 | 0 | 0 | 0 | 0 | 4 | 29 | 0 | 0 | 0 | 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.











