Surf Forecasts:
Black Rocks surf forecast from 25 Aug 2026:
- Best quality surf: Thursday 27 Aug, 2AM (local time) - 3.5ft (1.1m), 11s period, SSW swell with glassy winds.
- Most powerful swell: Tuesday 1 Sep, 8PM (local time) - 15ft (4.5m), 14s period, SW swell with 7,392 kJ wave energy.
- Next surfable swell (1★+): Thursday 27 Aug, 2AM (local time) - 3.5ft (1.1m), 11s period with SSW swell.
Best Forecast Surf Conditions for Black Rocks this week:
The surf forecast for Black Rocks over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 27) at 2AM. The primary swell is predicted to be 1.1m and 11s period with a secondary swell of 1.0m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Black Rocks in the next 16 days are 4.5m 14s and forecast to arrive on Tuesday (Sep 01) 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 1.5m 6s period and expected on Saturday (Aug 29) at 8PM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Thu 27th Aug) | 3.5ft (1.1m) 11s |
| Best Surf | 2AM (Thu 27th Aug) | 3.5ft (1.1m) 11s |
| Most Powerful | 8PM (Tue 1st Sep) | 15ft (4.5m) 14s |
Table - best surf conditions forecast for Black Rocks over the next 16 days.
The Lowdown
Alright you lot, Rusty here. Let's talk about what's in store for the next couple of weeks. It's a bit of a patchy forecast, with a long quiet stretch before some serious juice shows up for the big dogs. We're only looking at one spot here.
So, Black Rocks out on the reef. For the next week or so, it's a write-off, mostly. The wind is howling from the SE, or it's cross-onshore, making everything choppy and messy. Not much to get excited about.
But hold onto your board. As we turn the corner into September, things are looking up. Thursday, the 27th of August is the first time you'd want to get wet. The morning has a 5ft S swell with a light cross-off shore wind, but the afternoon is where the magic is. A clean 5ft swell from the S with a nice offshore breeze. It's clean and manageable for the more experienced. It does get packed here, so you'll have company.
The big daddy of the forecast is Wednesday, September 2nd. The morning session is the absolute standout. We've got a massive 12ft SW groundswell with a 14-second interval. This is serious, heavy water. With a moderate offshore wind from the WNW, it'll be glassy clean. The combined wave energy is a huge 4185, so you can feel the power in the air. This is expert territory only. The water temp is around 59°, which is about standard for this time of year. The afternoon of the 2nd still has a 10ft swell, but the wind shifts and picks up, so it's not as clean. Thursday the 3rd throws up a 13ft monster, but with a light onshore breeze, it won't be as good. That might be one for the kite surfers.
After the 4th of September, we're back into a messy spell of short-period windswell and onshore breezes through the 9th. There's a real gap there with nothing worthwhile. So, the only true standout in this whole 16-day outlook is that morning on the 2nd of September. Keep an eye on it, but don't plan the rest of your month around it.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Wed afternoon, min 12°C on Tue night). Winds decreasing (near gales from the SE on Tue afternoon, calm by Wed night). | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Sat night. Very mild (max 16°C on Sat afternoon, min 12°C on Sun night). Winds increasing (calm on Fri night, fresh winds from the SSW by Sat night). | |||||||||||||||||||
Tue 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | ||||||||||||||
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 13 | SSW 16 | SSW 11 | S 12 | S 11 | S 11 | S 11 | WSW 14 | WSW 13 | WSW 16 | SW 14 | SW 14 | SW 13 | SW 12 | SW 12 | SW 12 | SW 11 | SW 11 |
Wave Graph  | ||||||||||||||||||||
 kJ | 1443 | 905 | 623 | 305 | 331 | 604 | 501 | 403 | 326 | 342 | 295 | 314 | 476 | 1450 | 1286 | 864 | 960 | 773 | 574 | 663 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | on | glassy | cross-off | off | cross | cross | cross | cross-on | cross-off | cross-off | cross-off | cross-on | cross | cross | off | off | cross-off |
High Tide | 2:09PM1.31m | 2:14AM1.33m | 2:37PM1.42m | 2:44AM1.41m | 3:05PM1.52m | 3:14AM1.47m | 3:33PM1.59m | 3:44AM1.50m | 4:01PM1.63m | 4:15AM1.50m | 4:31PM1.63m | 4:48AM1.47m | 5:03PM1.60m | |||||||
Low Tide | 8:17PM0.34m | 8:28AM0.21m | 8:47PM0.25m | 8:55AM0.14m | 9:15PM0.16m | 9:22AM0.08m | 9:44PM0.10m | 9:49AM0.06m | 10:14PM0.07m | 10:18AM0.07m | 10:45PM0.07m | 10:48AM0.10m | 11:18PM0.11m | |||||||
 |  | | | |  | |  |  | |  | | |  | | | | | | | |
 | — | — | 7:13 | — | — | 7:11 | — | — | 7:09 | — | — | 7:09 | — | — | 7:07 | — | — | 7:05 | — | — |
 | 6:22 | — | — | 6:22 | — | — | 6:23 | — | — | 6:23 | — | — | 6:24 | — | — | 6:25 | — | — | 6:25 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — |
Temp °C | 16 | 15 | 14 | 21 | 21 | 19 | 19 | 16 | 15 | 15 | 15 | 15 | 16 | 14 | 14 | 14 | 14 | 12 | 13 | 13 |
Feels °C | 7 | 6 | 8 | 17 | 18 | 15 | 15 | 15 | 14 | 14 | 12 | 12 | 13 | 9 | 9 | 9 | 9 | 9 | 10 | 9 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 13 | SW 13 | SSW 11 | SSW 11 | S 12 | S 11 | S 11 | S 11 | S 10 | WSW 13 | WSW 12 | SW 10 | SW 14 | SW 13 | SW 12 | SW 12 | SW 12 | SW 11 | SW 11 |
| kJ | 1443 | 905 | 623 | 285 | 331 | 604 | 501 | 403 | 326 | 218 | 295 | 251 | 236 | 1450 | 1286 | 864 | 960 | 773 | 574 | 663 |
Swell 2 Height (m) Direction Period (s) | SSW 15 | S 7 | SSW 16 | WSW 12 | SE 8 | SW 12 | WSW 11 | WSW 11 | WSW 14 | WSW 14 | S 10 | S 11 | SW 14 | S 11 | SSE 10 | SE 10 | S 10 | S 9 | SSW 11 | WSW 11 |
| kJ | 123 | 73 | 266 | 264 | 129 | 135 | 140 | 69 | 123 | 342 | 128 | 157 | 476 | 59 | 22 | 26 | 8 | 2 | 403 | 93 |
Swell 3 Height (m) Direction Period (s) | — | SSW 16 | SW 12 | SSW 16 | SW 12 | WSW 12 | WSW 16 | WSW 15 | WSW 11 | SSE 14 | S 13 | WSW 16 | S 11 | WSW 8 | — | — | — | SE 9 | SE 9 | — |
| kJ | — | 51 | 124 | 284 | 209 | 256 | 26 | 87 | 65 | 66 | 89 | 314 | 86 | 43 | — | — | — | 3 | 3 | — |
Wind waves Height (m) Direction Period (s) | SSE 6 | SE 6 | SE 7 | SE 8 | — | NW 3 | W 3 | — | — | — | — | SSW 4 | — | — | — | SSE 4 | SE 4 | — | — | WNW 3 |
| kJ | 219 | 377 | 372 | 305 | — | 1 | 1 | — | — | — | — | 1 | — | — | — | 35 | 26 | — | — | 3 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 35 | 38 | 33 | 14 | 5 | 0 | 3 | 0 | 5 | 9 | 5 | 5 | 3 | 4 | 22 | 34 | 22 | 23 | 9 | 22 |
Best forecast wave conditions in Cape Town | ||||||||||||||||||||
Best forecast wave conditions in South Africa | ||||||||||||||||||||
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Information about the Black Rocks Surf forecast
The above surf forecast table for Black Rocks provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Black Rocks can be found by selecting the local surf guide option on the grey menu. Our Black Rocks 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 (Black Rocks) 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 Black Rocks 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.
Are you planning a holiday in Cape Town? If you are looking for accommodation near Black Rocks, camping, hotels and holiday cottages in Cape Town, consider staying in Cape Town which is 40 km (25 miles) away. Other places in and around Cape Town where you can find information about places to rent, and car hire include Bellville which is 46 km (29 miles) away, Stellenbosch, Grabouw and Kayamnandi.
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