Surf Forecasts:
Black Rocks surf forecast from 12 Sep 2026:
- Best quality surf: Sunday 13 Sep, 11PM (local time) - 7ft (2.2m), 10s period, ESE swell with offshore winds.
- Most powerful swell: Tuesday 15 Sep, 8PM (local time) - 8ft (2.5m), 16s period, WSW swell with 3,330 kJ wave energy.
- Next surfable swell (1★+): Sunday 13 Sep, 11PM (local time) - 7ft (2.2m), 10s period with ESE 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 Sunday (Sep 13) at 11PM. The primary swell is predicted to be 2.2m and 10s period with a secondary swell of 1.4m and 8s. Another secondary swell of 1.3m and 13s is also forecast. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Black Rocks in the next 16 days are 2.5m 16s and forecast to arrive on Tuesday (Sep 15) 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 1.8m 6s period and expected on Tuesday (Sep 15) at 2PM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Sun 13th Sep) | 7ft (2.2m) 10s |
| Best Surf | 11PM (Sun 13th Sep) | 7ft (2.2m) 10s |
| Most Powerful | 8PM (Tue 15th Sep) | 8ft (2.5m) 16s |
Table - best surf conditions forecast for Black Rocks over the next 16 days.
The Lowdown
Alright folks, Rusty here.
Looking at Black Rocks, it’s shaping up to be a rough stretch of waiting. This is an advanced reef break, but for nearly the first week and a half, the wind is going to ruin it. Those strong ESE to SE trades will have it looking like a washing machine – cross-onshore, blown out, and lumpy.
The first real chance you’ve got is September 20th. That Sunday morning, the wind goes glassy – dead flat. You’ll find a clean 4ft SW swell. It’s not big, but it’s the only clean option for a while. You might have company.
The session to save your annual leave for is the weekend of September 27th and 28th. On the 27th, Saturday afternoon, we’ve got a 6ft SSW swell with a clean 15 mph offshore wind from the west. That’s proper. But Sunday the 28th is the gem. Gentle offshore wind from the WSW, a clean 3ft to 4ft SW groundswell with a 16 to 18-second period. That’s long, lined-up swell that will wrap perfectly into the reef. The energy is there (947-951). It’ll be glassy, clean, and fast.
Everything else is compromised. There’s a big 8ft SSW swell on September 25th, but it’s lumpy and marginal. For pros only.
Two weeks on the calendar and really only two days worth paddling out. The morning of the 20th for a glassy session, and the weekend of the 27th-28th for the real deal.
- Rusty
Short Range ForecastLight rain (total 5mm), mostly falling on Sun night. Very mild (max 19°C on Sun night, min 14°C on Sat afternoon). Winds decreasing (near gales from the ESE on Sat night, light winds from the ESE by Sun night). | Days 5-7 Weather SummaryHeavy rain (total 24mm), heaviest during Tue night. Very mild (max 16°C on Tue afternoon, min 12°C on Tue night). Winds increasing (light winds from the SW on Tue night, near gales from the SE by Thu afternoon). | |||||||||||||||||||
Sat 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | ||||||||||||||
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 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 12 | SW 12 | SW 11 | SW 18 | SW 16 | SW 15 | SW 14 | SW 13 | SW 12 | SW 12 | SW 12 | SW 12 | SW 14 | SW 13 | SW 13 |
Wave Graph  | ||||||||||||||||||||
 kJ | 2558 | 1850 | 1163 | 816 | 480 | 292 | 232 | 155 | 168 | 909 | 3051 | 2644 | 1185 | 1118 | 869 | 655 | 638 | 1169 | 1228 | 1092 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 3:58PM1.69m | 4:16AM1.52m | 4:29PM1.63m | 4:47AM1.45m | 4:59PM1.53m | 5:18AM1.36m | 5:29PM1.41m | 5:48AM1.25m | 5:59PM1.27m | 6:21AM1.13m | 6:34PM1.13m | 7:06AM1.01m | 7:26PM1.01m | |||||||
Low Tide | 10:15PM0.01m | 10:19AM0.08m | 10:45PM0.07m | 10:49AM0.16m | 11:15PM0.17m | 11:18AM0.26m | 11:43PM0.28m | 11:47AM0.38m | 00:14AM0.41m | 12:18PM0.50m | 00:52AM0.53m | 1:00PM0.63m | 1:59AM0.64m | |||||||
 |  |  | |  |  | |  | | |  | |  |  | | |  | | | | |
 | — | — | 6:48 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:43 | — | — | 6:41 | — | — |
 | 6:35 | — | — | 6:35 | — | — | 6:36 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:38 | — |
mm | — | — | — | — | 3 | 1 | — | 1 | — | 1 | 23 | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 15 | 16 | 18 | 19 | 16 | 17 | 15 | 16 | 16 | 13 | 13 | 14 | 14 | 14 | 15 | 15 | 15 | 14 | 14 |
Feels °C | 5 | 5 | 14 | 16 | 18 | 11 | 11 | 10 | 8 | 7 | 10 | 5 | 6 | 5 | 5 | 5 | 6 | 7 | 4 | 5 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 12 | SW 12 | SW 11 | SW 11 | SW 16 | SW 15 | SW 14 | SW 13 | SW 12 | SW 12 | SW 12 | SW 12 | SW 14 | SW 13 | SW 13 |
| kJ | 2558 | 1850 | 1163 | 816 | 480 | 292 | 232 | 155 | 92 | 909 | 3051 | 2644 | 1185 | 1118 | 869 | 655 | 638 | 1169 | 1228 | 1092 |
Swell 2 Height (m) Direction Period (s) | — | — | SSE 8 | SSE 12 | SE 9 | SE 9 | SE 13 | SE 9 | SW 18 | WSW 8 | SW 15 | SSW 8 | WSW 13 | WSW 12 | W 12 | W 12 | — | — | — | SW 16 |
| kJ | — | — | 356 | 14 | 190 | 70 | 59 | 14 | 168 | 92 | 606 | 192 | 102 | 454 | 232 | 46 | — | — | — | 291 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | SSE 13 | — | SE 13 | SW 14 | SE 13 | NW 7 | ESE 12 | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | 16 | — | 7 | 97 | 7 | 46 | 14 | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SE 7 | SE 8 | SE 9 | SE 8 | NNW 4 | NW 5 | NW 6 | NW 6 | NW 6 | NW 7 | — | SE 4 | SSE 6 | SE 6 | SE 6 | SSE 6 | SE 6 | SSE 5 | SSE 5 | SE 4 |
| kJ | 572 | 531 | 1077 | 330 | 8 | 64 | 160 | 152 | 157 | 226 | — | 19 | 204 | 185 | 209 | 299 | 154 | 83 | 71 | 27 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 377 | 33 | 5 | 9 | 4 | 21 | 156 | 66 | 264 | 220 | 34 | 35 | 35 | 35 | 56 | 221 | 35 | 221 | 399 | 25 |
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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