Surf Forecasts:
Nine Mile Reef surf forecast from 31 Aug 2026:
- Best quality surf: Tuesday 1 Sep, 5PM (local time) - 7ft (2.2m), 14s period, SSW swell with cross-onshore winds.
- Most powerful swell: Thursday 3 Sep, 11AM (local time) - 13ft (4.0m), 10s period, S swell with 2,736 kJ wave energy.
- Next surfable swell (1★+): Tuesday 1 Sep, 8AM (local time) - 6ft (1.8m), 13s 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 Tuesday (Sep 01) at 8AM. The primary swell is predicted to be 1.8m and 13s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Nine Mile Reef in the next 16 days are 4.0m 10s and forecast to arrive on Thursday (Sep 03) at 11AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Thursday (Sep 03) at 8AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Tue 1st Sep) | 6ft (1.8m) 13s |
| Best Surf | 5PM (Tue 1st Sep) | 7ft (2.2m) 14s |
| Most Powerful | 11AM (Thu 3rd Sep) | 13ft (4.0m) 10s |
Table - best surf conditions forecast for Nine Mile Reef over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get into it.
We’re looking at a slow start this week. The water is sitting at 57.6°F, which is a bit colder than normal for this time of year, so you’ll want that extra rubber.
The first real chance to get wet doesn’t come until Tuesday morning, September 1st. Nine Mile Reef is the only spot on the cards, and it finally shows some life. We’ve got a solid 6.2ft SSW groundswell rolling in with a long 14-second period, and the combined energy is pumping strong at 1272. The real kicker? It’s glassy. Absolutely no wind. That’s a major positive for a reef break, and it’s going to be clean, lined-up waves. This is the standout of the whole outlook. It’s a bit stout for beginners at that size, but for experienced surfers, this is the session to aim for. Tuesday afternoon stays clean but the wind goes cross-on, so the morning is the clear winner.
After that, things get messy. Wednesday and Thursday see the wind shifting onshore and building, with Thursday morning, September 3rd, bringing rain showers and a 22 mph SSE wind. The swell jumps to 13.1ft with a nasty 10-second period, and the combined energy hits 3523 – that’s raw, ugly power. That’s strictly for the experts, and even then, it’ll be a battle. The wind does not let up through Friday or Saturday, with strong cross-onshore breezes and choppy, blown-out conditions. Not worth paddling out.
We get a bit of a reprieve on Monday, September 7th. The morning brings a light 3 mph cross-offshore breeze and a clean 4.3ft SSE swell with a 12-second period. Combined energy is moderate at 601. It’s not the size of the Tuesday before, but it’s clean and rideable. The afternoon turns glassy again with a smaller 3.6ft swell. A nice little session if you’re keen.
The rest of the second week is pretty quiet. The swell drops right off. Tuesday the 8th has glassy 2.6ft waves, but it’s very ordinary. Wednesday the 9th is down to 1ft with a 47 combined energy – that’s barely a ripple. The pattern holds through to the weekend with consistent onshore winds and small, weak swell. Nothing here to get excited about.
The tail end of the window, Monday, September 14th, offers a small clean window with 2.3ft waves and a light cross-off breeze, but it’s a tiny, summery wave. Tuesday the 15th looks more interesting, with a 16 mph offshore wind and a 5.2ft SSW swell, but the period is a very long 15 seconds– that’s a groundswell that can break straight at a reef. The combined energy is strong at 1846, but the quality is hit-or-miss due to the period. It’s a long-range call, so keep an eye on it, but it’s not a sure thing.
Best bet: Tuesday morning, September 1st at Nine Mile Reef. Glassy, solid groundswell, and the best wave of the 16 days without a doubt.
Short Range ForecastMostly dry. Very mild (max 17°C on Wed afternoon, min 10°C on Mon morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 7mm), mostly falling on Thu afternoon. Warm (max 21°C on Sat afternoon, min 11°C on Fri night). Mainly strong winds. | ||||||||||||||||||||
Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | |||||||||||||||
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 11 | SW 11 | SW 12 | SSW 14 | SSW 14 | SW 14 | SW 13 | SW 13 | SW 13 | S 10 | S 10 | SSE 10 | SSE 9 | SSE 9 | SE 8 | SE 6 | SE 6 | SSW 17 | SE 8 | SE 9 | SE 9 |
Wave Graph | |||||||||||||||||||||
380 | 354 | 683 | 1272 | 1722 | 1570 | 1280 | 1083 | 712 | 2736 | 2437 | 1670 | 1012 | 834 | 362 | 167 | 252 | 556 | 407 | 594 | 1484 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | glassy | cross-on | glassy | on | on | off | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross |
High Tide | 5:03PM1.61m | 5:22AM1.43m | 5:37PM1.54m | 6:00AM1.33m | 6:18PM1.43m | 6:47AM1.21m | 7:09PM1.29m | 7:54AM1.09m | 8:29PM1.16m | 9:45AM1.04m | 10:28PM1.13m | 11:38AM1.12m | 00:04AM1.21m | ||||||||
Low Tide | 10:48AM0.11m | 11:18PM0.12m | 11:21AM0.18m | 11:55PM0.19m | 11:59AM0.28m | 00:38AM0.30m | 12:45PM0.40m | 1:37AM0.43m | 1:54PM0.54m | 3:13AM0.52m | 3:57PM0.60m | 5:15AM0.49m | 5:55PM0.51m | ||||||||
7:05 | — | — | 7:03 | — | — | 7:03 | — | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — | — | 6:56 | — | — | |
— | 6:25 | — | — | 6:25 | — | — | 6:27 | — | — | 6:28 | — | — | 6:28 | — | — | 6:29 | — | — | 6:30 | — | |
mm | — | — | — | — | — | — | — | — | — | 1 | 6 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 12 | 13 | 12 | 14 | 15 | 14 | 16 | 17 | 14 | 14 | 15 | 15 | 17 | 18 | 14 | 17 | 21 | 15 | 18 | 21 | 15 |
Feels °C | 8 | 9 | 10 | 13 | 14 | 13 | 14 | 14 | 13 | 8 | 7 | 6 | 9 | 10 | 8 | 13 | 17 | 10 | 13 | 16 | 11 |
Swell 1 Height (m) Direction Period (s) | SW 11 | SW 11 | SW 12 | SSW 14 | SSW 14 | SW 14 | SW 13 | SW 13 | SW 13 | WSW 12 | WSW 12 | WSW 12 | WSW 11 | S 15 | SW 11 | SSW 10 | SSW 10 | SSW 17 | SW 14 | SW 14 | SE 9 |
380 | 354 | 683 | 1272 | 1722 | 1570 | 1280 | 1083 | 712 | 787 | 557 | 385 | 176 | 4 | 29 | 77 | 74 | 556 | 407 | 200 | 353 | |
Swell 2 Height (m) Direction Period (s) | S 11 | S 10 | — | — | — | — | — | — | S 10 | — | — | — | S 13 | S 15 | SSW 13 | SW 10 | SW 10 | SSW 9 | S 18 | S 17 | SSW 13 |
2 | 2 | — | — | — | — | — | — | 113 | — | — | — | 4 | 4 | 34 | 25 | 16 | 68 | 227 | 144 | 195 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SSW 21 | SW 9 | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 42 | 3 | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | S 10 | S 10 | SSE 10 | SSE 9 | SSE 9 | SE 8 | SE 6 | SE 6 | SE 6 | SE 8 | SE 9 | SE 9 |
— | — | — | — | — | — | — | — | — | 2736 | 2437 | 1670 | 1012 | 834 | 362 | 167 | 252 | 193 | 395 | 594 | 1484 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 32 | 27 | 16 | 0 | 10 | 12 | 21 | 21 | 0 | 197 | 3857 | 1059 | 1312 | 1974 | 16 | 16 | 31 | 30 | 27 | 27 | 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.











