Surf Forecasts:
Nine Mile Reef surf forecast from 13 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 2AM (local time) - 7ft (2.1m), 12s period, SW swell with cross-onshore winds.
- Most powerful swell: Thursday 13 Aug, 11AM (local time) - 5ft (1.5m), 18s period, SW swell with 1,327 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 5AM (local time) - 3.5ft (1.1m), 20s period with SW swell.
Best Forecast Surf Conditions for Nine Mile Reef this week:
The surf forecast for Nine Mile Reef over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 13) at 5AM. The primary swell is predicted to be 1.1m and 20s period with a secondary swell of 1.1m and 16s. Another secondary swell of 0.7m and 12s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Nine Mile Reef in the next 16 days are 1.5m 18s and forecast to arrive on Thursday (Aug 13) at 11AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Sunday (Aug 16) at 5PM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Thu 13th Aug) | 3.5ft (1.1m) 20s |
| Best Surf | 2AM (Wed 19th Aug) | 7ft (2.1m) 12s |
| Most Powerful | 11AM (Thu 13th Aug) | 5ft (1.5m) 18s |
Table - best surf conditions forecast for Nine Mile Reef over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what’s on the cards for Nine Mile Reef over the next couple of weeks.
We’ve got a solid run of swell on the way, but it takes a bit of patience to get to the good stuff. The first few days are small or messy, with a few sessions that are worth a paddle but nothing that’ll have you ringing in sick. The real standout arrives about a week and a half out.
Thursday morning the 13th kicks things off with a clean 5ft SW groundswell and a light offshore breeze from the NNE. The period is a long 18 seconds, so there’s serious energy in the water – combined energy is 1414 (strong). This is one for experienced surfers; the size and power make it a bit much for beginners. The water temp is about average for the time of year, nothing wild.
Friday morning the 14th sees the swell drop to 3ft, but the wind is still offshore from the N at 25 km/h, keeping it clean. The period drops to 15 seconds, still a quality groundswell. It’s a good morning for a longer board.
Monday morning the 17th is a real treat – glassy conditions with a SSW breeze at just 5 km/h, and the swell bumps back up to 5ft from the SW at 13 seconds. Combined energy is 632 (moderate). The glassy surface means it’ll be clean and lined up, a proper session for the experienced intermediate.
Now, the real standout. Thursday morning the 27th – we’ve got 4ft SW swell at a very long 17 seconds, combined energy of 756 (moderate), with a light cross-off from the NW. It’s clean, the swell direction is dead on the optimum SSE, and the period is long enough to bring real shape. But the real gem is Thursday afternoon the 27th – glassy conditions, 5ft SW swell at 16 seconds, combined energy of 1085 (strong). This is the best on offer in the whole outlook: powerful, clean, and calling for the experienced surfer. The reef setup will handle that long period beautifully.
After that, Friday morning the 28th keeps the magic going – glassy, 5ft SW at 16 seconds, combined energy 1124 (strong). Another cracker.
There’s a rough patch from the 19th through the 25th, with strong cross-onshore winds and lumpy, choppy conditions. The 19th and 20th are particularly poor – the swell is there but the wind is fresh onshore, making it a write-off. The 21st offers a brief glassy window but the swell is only 3ft.
The first week is a mixed bag of clean mornings and messy afternoons. The second week opens with a calm, glassy day on the 26th but the swell is tiny at 1ft. Then it all comes together for that late-August run.
Bottom line: the best sessions are Thursday morning the 27th, Thursday afternoon the 27th, and Friday morning the 28th. That’s the window to circle. The rest is either small, windy, or both.
Rusty out.
Short Range ForecastMostly dry. Warm (max 25°C on Thu afternoon, min 13°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 19°C on Sun afternoon, min 13°C on Sun morning). Wind will be generally light. | ||||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | |||||||||||||||
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 18 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 | WSW 14 | WSW 15 | SW 15 | SW 14 | WSW 13 | SW 13 | SW 13 | SW 12 | SW 12 | SW 12 | WSW 11 | SW 11 | SSE 6 |
Wave Graph | |||||||||||||||||||||
1327 | 943 | 611 | 360 | 355 | 308 | 264 | 257 | 328 | 372 | 503 | 840 | 581 | 569 | 488 | 430 | 367 | 1229 | 592 | 360 | 215 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | off | off | cross-off | cross-off | glassy | on | off | cross-off | cross-off | off | on | on | glassy | cross-off | on | cross-on | cross-on | cross-on | cross-on |
High Tide | 3:53PM1.70m | 4:08AM1.57m | 4:29PM1.70m | 4:45AM1.52m | 5:04PM1.66m | 5:21AM1.44m | 5:38PM1.57m | 5:55AM1.34m | 6:12PM1.44m | 6:30AM1.23m | 6:46PM1.31m | 7:09AM1.11m | 7:27PM1.17m | ||||||||
Low Tide | 9:40AM-0.01m | 10:08PM0.02m | 10:16AM-0.00m | 10:46PM0.04m | 10:51AM0.05m | 11:22PM0.10m | 11:24AM0.14m | 11:56PM0.20m | 11:56AM0.25m | 00:30AM0.31m | 12:28PM0.38m | 1:07AM0.43m | 1:04PM0.51m | 1:53AM0.55m | |||||||
7:26 | — | — | 7:26 | — | — | 7:24 | — | — | 7:24 | — | — | 7:22 | — | — | 7:20 | — | — | 7:20 | — | — | |
— | 6:13 | — | — | 6:14 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 25 | 22 | 17 | 18 | 14 | 15 | 19 | 16 | 17 | 19 | 16 | 17 | 18 | 16 | 16 | 17 | 14 | 13 | 13 | 12 |
Feels °C | 19 | 20 | 19 | 12 | 14 | 13 | 14 | 18 | 15 | 13 | 15 | 14 | 16 | 16 | 16 | 15 | 14 | 12 | 8 | 8 | 8 |
Swell 1 Height (m) Direction Period (s) | SW 18 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 | WSW 14 | WSW 15 | SW 15 | SW 14 | WSW 13 | SW 13 | SW 13 | SW 12 | SW 12 | SW 12 | SW 11 | SW 11 | SW 11 |
1327 | 943 | 611 | 360 | 355 | 308 | 264 | 257 | 328 | 372 | 503 | 840 | 581 | 569 | 488 | 430 | 367 | 1229 | 439 | 360 | 198 | |
Swell 2 Height (m) Direction Period (s) | SE 12 | SE 12 | SE 12 | SSE 11 | SE 12 | W 6 | WSW 6 | WSW 7 | SSE 4 | ESE 10 | — | — | — | — | SW 14 | SW 12 | SW 12 | WSW 11 | WSW 11 | — | — |
89 | 35 | 35 | 13 | 5 | 6 | 7 | 21 | 2 | 9 | — | — | — | — | 218 | 256 | 236 | 331 | 592 | — | — | |
Swell 3 Height (m) Direction Period (s) | S 10 | — | — | — | — | ESE 9 | ESE 10 | ESE 10 | ESE 10 | — | — | — | — | — | — | E 11 | E 11 | E 11 | — | — | — |
2 | — | — | — | — | 17 | 9 | 10 | 10 | — | — | — | — | — | — | 2 | 2 | 2 | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | NNW 3 | WNW 4 | — | — | — | — | NNW 2 | W 4 | — | — | — | — | WNW 3 | — | SSW 11 | SSE 5 | SSE 5 | SSE 6 |
— | — | — | 3 | 7 | — | — | — | — | 1 | 16 | — | — | — | — | 8 | — | 698 | 67 | 105 | 215 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 16 | 0 | 18 | 0 | 0 | 18 | 22 | 0 | 0 | 10 | 83 | 21 | 31 | 16 |
Best forecast wave conditions in Cape Town | |||||||||||||||||||||
Best forecast wave conditions in South Africa | |||||||||||||||||||||
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Information about the Nine Mile Reef Surf forecast
The above surf forecast table for Nine Mile Reef provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Nine Mile Reef can be found by selecting the local surf guide option on the grey menu. Our Nine Mile Reef 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 (Nine Mile Reef) 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 Nine Mile Reef 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.
Nine Mile Reef is 19 km (12 miles) from the very large city of Bellville. If you plan a holiday in Cape Town, look for hotels and other accommodation in Bellville. Bellville has rooms for a wide range of budgets as well as cheap car hire and transport links.











