
Surf Forecasts:
Nine Mile Reef surf forecast from 11 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 8AM (local time) - 3.5ft (1.1m), 20s period, SW swell with cross-offshore winds.
- Most powerful swell: Tuesday 18 Aug, 5AM (local time) - 7ft (2.1m), 14s period, SW swell with 1,760 kJ wave energy.
- Next surfable swell (1★+): Wednesday 12 Aug, 8AM (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 Wednesday (Aug 12) at 8AM. The primary swell is predicted to be 1.1m and 20s period with a secondary swell of 0.9m and 8s. Another secondary swell of 2.1m and 9s 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 2.1m 14s and forecast to arrive on Tuesday (Aug 18) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 13s period and expected on Monday (Aug 17) at 8AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Wed 12th Aug) | 3.5ft (1.1m) 20s |
| Best Surf | 8AM (Wed 12th Aug) | 3.5ft (1.1m) 20s |
| Most Powerful | 5AM (Tue 18th Aug) | 7ft (2.1m) 14s |
Table - best surf conditions forecast for Nine Mile Reef over the next 16 days.
The Lowdown
Alright, Rusty here. Let's talk about Nine Mile Reef.
We've got a consistent run of swell on the horizon, but it’s a bit of a mixed bag with the wind. The water's running a touch cold for this time of year, sitting at 58°F, a couple degrees below normal, so you might want the thicker rubber, especially out there on the reef.
The core of the action starts this week and stretches through the next. Right now, this is a reef break setup, and it's fairly consistent. The optimum swell direction is SSE, but we're seeing most of our energy from the S and SW. The energy levels are solid, with combined swell energy readings well into the three-digit and four-digit range, meaning moderate to strong wave energy.
For Tuesday the 12th, Wednesday afternoon is the absolute standout. The swell is 4ft from the SW, but check that period – 18 seconds. That’s very long period groundswell, proper energy, and the wind is glassy. Glassy. It doesn't get much cleaner on a reef. The combined energy is a thumping 1580 (moderate to strong). This is where you want to be. Thursday the 13th morning is also a cracker, with 5ft SW swell at 18 seconds and a clean offshore breeze from the NNE. The energy is 1414, strong stuff. That's expert territory at over 5ft, so know your limits, but the quality will be top shelf.
The first weekend, Saturday the 15th morning is small but appealing with 3ft SW swell and glassy conditions. Nice clean little waves. Then the Monday the 17th sees a return of some size, with 5ft SW and cross-offshore winds keeping things tidy.
We hit some proper onshore junk from Tuesday the 18th through the end of the following week, with strong winds and lumpy conditions. That stretch is a write-off. The next proper window doesn't look promising again until Sunday the 23rd morning, where we get glassy conditions on 4ft SW swell. That's a decent morning.
If you’re holding out for something bigger, Monday the 24th morning is the one. 6ft SW swell at 14 seconds, glassy conditions, and energy at 1307. That’s excellent for experienced surfers, but over 5ft, it’s not for the faint of heart.
So, the pick of the whole run is Wednesday the 12th afternoon and Thursday the 13th morning. The long period and clean wind are a gift. Keep an eye on Monday the 24th as a promising cap to the outlook, but remember it's further out so keep an ear to the ground.
Rusty.
Short Range ForecastMostly dry. Warm (max 24°C on Thu afternoon, min 11°C on Tue morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 21°C on Fri morning, min 13°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | |||||||||||||||
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) | S 12 | SSW 11 | SW 22 | SW 18 | SW 18 | SW 16 | SW 18 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 | SW 14 | SW 14 | SW 14 | SW 13 | SW 15 | WSW 14 | SW 13 |
Wave Graph | |||||||||||||||||||||
1022 | 349 | 906 | 1101 | 985 | 844 | 1327 | 943 | 611 | 415 | 418 | 357 | 308 | 299 | 272 | 305 | 401 | 632 | 773 | 742 | 553 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | glassy | cross | off | glassy | off | off | cross-off | off | glassy | cross-on | off | off | on | cross-off | cross-off | cross-off | cross-off |
High Tide | 2:32PM1.53m | 2:47AM1.55m | 3:14PM1.64m | 3:29AM1.58m | 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 | ||||||||
Low Tide | 8:21AM0.11m | 8:45PM0.14m | 9:02AM0.03m | 9:28PM0.06m | 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 | |||||||
7:28 | — | — | 7:28 | — | — | 7:26 | — | — | 7:26 | — | — | 7:24 | — | — | 7:24 | — | — | 7:22 | — | — | |
— | 6:12 | — | — | 6:12 | — | — | 6:13 | — | — | 6:14 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 |
Temp °C | 13 | 18 | 14 | 16 | 21 | 20 | 22 | 24 | 20 | 21 | 21 | 17 | 17 | 19 | 16 | 17 | 20 | 16 | 18 | 21 | 16 |
Feels °C | 10 | 13 | 10 | 13 | 19 | 17 | 19 | 19 | 18 | 17 | 16 | 14 | 16 | 17 | 15 | 14 | 19 | 14 | 15 | 18 | 14 |
Swell 1 Height (m) Direction Period (s) | S 12 | SSW 11 | SE 8 | SW 18 | SW 18 | SW 16 | SW 18 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 | SW 14 | SW 14 | SW 14 | SW 13 | SW 15 | WSW 14 | SW 13 |
1022 | 349 | 196 | 1101 | 985 | 844 | 1327 | 943 | 611 | 415 | 418 | 357 | 308 | 299 | 272 | 305 | 401 | 632 | 773 | 742 | 553 | |
Swell 2 Height (m) Direction Period (s) | SW 26 | SW 24 | SW 22 | SW 10 | SE 6 | SW 21 | SE 12 | SSE 12 | SE 12 | SE 12 | SE 12 | SE 6 | SE 11 | SE 10 | — | ESE 11 | — | — | — | — | SW 7 |
27 | 149 | 906 | 52 | 33 | 658 | 87 | 55 | 48 | 35 | 22 | 2 | 29 | 28 | — | 11 | — | — | — | — | 105 | |
Swell 3 Height (m) Direction Period (s) | W 16 | WSW 10 | SSW 11 | S 10 | SW 10 | SE 11 | — | — | — | — | — | SE 12 | — | — | — | — | — | — | — | — | — |
5 | 20 | 135 | 31 | 27 | 96 | — | — | — | — | — | 5 | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | SE 8 | SE 8 | ESE 8 | SE 8 | ESE 9 | E 3 | — | — | — | — | WNW 4 | NW 2 | — | — | — | NW 2 | WNW 3 | — | — | — | SW 7 |
549 | 253 | 785 | 82 | 535 | 5 | — | — | — | — | 13 | 1 | — | — | — | 1 | 1 | — | — | — | 281 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 16 | 16 | 12 | 12 | 0 | 16 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 16 | 0 | 0 | 20 | 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 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.











