Surf Forecasts:
Nine Mile Reef surf forecast from 16 Aug 2026:
- Best quality surf: Monday 17 Aug, 2AM (local time) - 5ft (1.6m), 14s period, SW swell with offshore winds.
- Most powerful swell: Thursday 20 Aug, 8PM (local time) - 6ft (1.9m), 13s period, SSW swell with 1,245 kJ wave energy.
- Next surfable swell (1★+): Sunday 16 Aug, 11AM (local time) - 3.5ft (1.0m), 15s 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 Sunday (Aug 16) at 11AM. The primary swell is predicted to be 1.0m and 15s period with a secondary swell of 0.1m and 10s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Nine Mile Reef in the next 16 days are 1.9m 13s and forecast to arrive on Thursday (Aug 20) at 8PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Saturday (Aug 22) at 2PM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Sun 16th Aug) | 3.5ft (1.0m) 15s |
| Best Surf | 2AM (Mon 17th Aug) | 5ft (1.6m) 14s |
| Most Powerful | 8PM (Thu 20th Aug) | 6ft (1.9m) 13s |
Table - best surf conditions forecast for Nine Mile Reef over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s cut to the chase. The water's running a bit nippier than normal, about 3°F colder than the seasonal average, so keep that in mind.
The next few days are a bit of a mixed bag. Sunday the 16th and Monday the 17th have some surf – we’re looking at 3ft to 5ft from the southwest. The period is long, up around 15 seconds, so there’s some punch. Offshore winds in the morning keep it clean. It’s surfable, but nothing to get fired up about. Then the wind swings onshore from Tuesday the 18th through Thursday the 20th. The swell pushes up to 5ft to 6ft, but it’s ragged and blown out. The energy is high, but the quality is poor. Those are days for boat repairs.
Now, Friday the 21st is your first real window. The swell backs off to a clean 5ft from the SSW, and the morning is absolutely glassy – dead calm. That long period and no wind will have Nine Mile Reef looking like a sheet of glass. It’ll be clean and lined up. That’s the call for the week.
Saturday the 22nd holds up with a solid offshore breeze keeping the 5ft swell in check. Another good one. Sunday the 23rd turns ugly with the wind going onshore and the swell jumping to nearly 8ft in the afternoon. That’s a stormy, churning mess.
Monday the 24th is a beast. The models call for an 8ft SSW swell with a long 15-second period. The energy is massive. But the warning is clear: it’s too big for this reef. This is not a beginner day, and even for the skilled, it’s going to be heavy and potentially dangerous. The wind is light, but the size is the issue.
Keep your eyes on Wednesday the 26th. That’s the second gem. We’ve got a 6ft southwest swell riding a 16-second period, and the morning wind goes dead glassy again. The energy is strong. This is for experienced surfers – long period groundswell on the reef, powerful and clean. Get out early before the afternoon breeze messes with it.
After that, it’s a slow slide into a week of smaller, weaker southern hemi swells, mostly in the 3ft to 4ft range with a mix of cross-offshore winds. The energy drops off, and it looks a little lackluster.
Then, on Sunday the 30th, another big pulse shows up. Glassy morning with an 8ft SW swell at a long 16-second period. The energy is through the roof. But yet again, the call is that it’s just too big for Nine Mile Reef. It’s a warning for the casual surfer, and a hefty challenge for the experts.
So mark your board for Friday the 21st and Wednesday the 26th. The 21st is the cleaner, more manageable option. The 26th is for the big-wave crew. Both will be glassy, but they’re entirely different animals. Pick your poison.
Rusty.
Short Range ForecastMostly dry. Very mild (max 19°C on Sun afternoon, min 13°C on Sun morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 17°C on Fri afternoon, min 12°C on Fri morning). Wind will be generally light. | ||||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | |||||||||||||||
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 | SW 15 | SW 14 | SW 13 | SW 13 | SW 13 | SW 12 | SW 13 | SSW 12 | SSW 12 | SW 12 | SSW 12 | SSW 13 | SSW 13 | SSW 12 | SSW 11 | SSW 11 | SSW 10 | SSW 12 | SW 13 | SW 13 |
Wave Graph | |||||||||||||||||||||
429 | 543 | 1034 | 721 | 577 | 637 | 666 | 1077 | 908 | 795 | 718 | 691 | 1152 | 1189 | 1003 | 546 | 419 | 220 | 509 | 796 | 721 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | off | off | cross-off | on | on | on | cross-on | on | on | cross-on | on | on | cross-on | glassy | on | off | off | cross-on | on |
High Tide | 5:38PM1.57m | 5:55AM1.34m | 6:12PM1.44m | 6:30AM1.23m | 6:46PM1.31m | 7:09AM1.11m | 7:27PM1.17m | 8:02AM1.00m | 8:28PM1.05m | 9:44AM0.92m | 10:23PM0.99m | 11:56AM0.97m | 00:07AM1.04m | ||||||||
Low Tide | 11:24AM0.14m | 11:56PM0.20m | 11:56AM0.25m | 00:30AM0.31m | 12:28PM0.38m | 1:07AM0.43m | 1:04PM0.51m | 1:53AM0.55m | 1:53PM0.63m | 3:15AM0.64m | 3:47PM0.72m | 5:33AM0.63m | 6:08PM0.67m | ||||||||
7:24 | — | — | 7:22 | — | — | 7:20 | — | — | 7:20 | — | — | 7:18 | — | — | 7:18 | — | — | 7:16 | — | — | |
— | 6:15 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:17 | — | — | 6:19 | — | — | 6:19 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 |
Temp °C | 16 | 19 | 15 | 17 | 19 | 17 | 16 | 17 | 14 | 15 | 15 | 14 | 15 | 16 | 15 | 15 | 17 | 14 | 15 | 16 | 15 |
Feels °C | 12 | 15 | 13 | 15 | 18 | 17 | 14 | 14 | 11 | 14 | 12 | 12 | 12 | 12 | 13 | 14 | 16 | 14 | 11 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 15 | SW 14 | SW 13 | SW 13 | SW 13 | SW 12 | SW 13 | SSW 12 | SSW 12 | SW 12 | SSW 12 | SSW 13 | SSW 13 | SSW 12 | SSW 11 | SSW 11 | SSW 10 | SSW 12 | SW 13 | SW 13 |
429 | 543 | 1034 | 721 | 577 | 637 | 666 | 1077 | 908 | 795 | 718 | 691 | 1152 | 1189 | 1003 | 546 | 419 | 220 | 509 | 796 | 721 | |
Swell 2 Height (m) Direction Period (s) | SE 10 | — | — | — | SW 16 | SW 14 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
4 | — | — | — | 42 | 368 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | NNW 3 | WNW 3 | — | — | WNW 3 | — | — | — | — | — | SSE 3 | — | — | SSE 4 | ESE 4 | — | — | — | NW 3 | — | — |
1 | 3 | — | — | 1 | — | — | — | — | — | 2 | — | — | 16 | 31 | — | — | — | 4 | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 21 | 16 | 29 | 16 | 21 | 21 | 16 | 16 | 380 | 12 | 0 | 10 | 0 | 0 | 10 | 27 |
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.











