
Surf Forecasts:
Nine Mile Reef surf forecast from 31 Jul 2026:
- Best quality surf: Thursday 6 Aug, 2AM (local time) - 15ft (4.5m), 13s period, WSW swell with offshore winds.
- Most powerful swell: Thursday 6 Aug, 2AM (local time) - 15ft (4.5m), 13s period, WSW swell with 7,004 kJ wave energy.
- Next surfable swell (1★+): Friday 31 Jul, 11PM (local time) - 2ft (0.6m), 11s 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 Friday (Jul 31) at 11PM. The primary swell is predicted to be 0.6m and 11s period with a secondary swell of 0.4m and 9s. 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 4.5m 13s and forecast to arrive on Thursday (Aug 06) at 2AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 5s period and expected on Wednesday (Aug 05) at 8PM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Fri 31st Jul) | 2ft (0.6m) 11s |
| Best Surf | 2AM (Thu 6th Aug) | 15ft (4.5m) 13s |
| Most Powerful | 2AM (Thu 6th Aug) | 15ft (4.5m) 13s |
Table - best surf conditions forecast for Nine Mile Reef over the next 16 days.
The Lowdown
Alright, let’s see what’s running. The forecast kicks off on Friday, July 31st, with a small but clean start. The water temp is sitting at 59°F, about 1°F cooler than usual for this time of year – nothing too crazy, just a little brisk.
We’re looking at Nine Mile Reef (a reef break, exposed to the SSE swell window). It’s a fairly consistent spot, good for beginners, but it can get crowded sometimes.
The opening session on Friday morning is a real treat. Glossy conditions with the wind barely a whisper from the SSE at 3 mph, and a clean 3 ft SW swell rolling in at a nice 12-second period. The combined energy is moderate (288), and it’s just a lovely, easy paddle. The afternoon holds the same glassy feel, just a touch smaller at 2 ft.
Saturday, August 1st, brings clear skies and a glassy morning again, with a 3 ft SW swell that has a bit more grunt at a 14-second period. The afternoon turns a bit onshore, though, so the morning is the pick.
Sunday, the 2nd, is a standout. A crisp morning with a light offshore breeze from the NNW at 6 mph, cleaning up a 3 ft SW swell (13-second period). The wave energy is moderate (227) but the conditions are clean. The afternoon goes back to glassy, so it’s a solid day all round.
Monday, the 3rd, repeats the trick: glassy morning, 3 ft SW swell, moderate energy (343), and a 13-second period. The afternoon gets a bit of an onshore bump, so morning sessions are the go.
Now, here’s the real highlight. Wednesday, August 5th. The morning brings a 6 ft SW swell with a 14-second period, and a strong offshore breeze from the NNW at 16 mph. This is proper, clean, powerful surf. The combined wave energy is strong (1256), and it’s a setup that will have the experts grinning. The afternoon is still very good, just a touch cross-off.
Thursday, the 6th, sees a big jump in size – a 10 ft SW swell with a 14-second period, but the wind shifts onshore from the SSE at 12 mph. The energy is very strong (5770), but at this size, it’s too big for the reef and beginners should steer clear. This is for experts only, and the wind is messy.
Friday, the 7th, is another cracker for the experienced crew. A 7 ft SSW swell, 13-second period, with a light cross-off breeze from the NW. The energy is still strong (1444), but the conditions are clean. The morning is the best bet.
The weekend of the 8th and 9th holds solid size, but the wind is a bit of a mixed bag. Saturday is cross-on, making it choppy, but Sunday the 9th has a nice offshore breeze from the N at 9 mph, cleaning up a 7 ft SSW swell. The energy is high (1936), but it’s manageable for the experienced.
From the 10th, the wind turns messy and the swell drops, making conditions poor. There’s a brief window on the morning of the 12th with a 7 ft SW swell and glassy conditions, but the energy is strong (1598) and it’s too big for the break. The 13th brings a cleaner morning with a 5 ft SSW swell, but the wind is light cross-off, so it’s a decent option for the experienced.
The 15th of August sees a final pulse of big swell – 7 ft to 8 ft SW with a very long 15-second period. The energy is very strong (2230), but it’s glassy in the morning. At this size, though, it’s only for the experts, and the long period means it’s going to be a bit fat and straight at this reef.
Overall, the best bets are the mornings of the 5th and 7th of August for the experienced crew, with the 2nd and 3rd being the sweet spot for the rest of us. The gap between the 10th and the 13th is a bit of a write-off, so keep an eye on the window.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Sat afternoon, min 16°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Wed night. Warm (max 20°C on Mon afternoon, min 11°C on Tue night). Winds increasing (calm on Tue night, fresh winds from the NW by Wed afternoon). | ||||||||||||||||||||
Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 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 12 | SW 18 | SW 11 | SW 14 | SW 13 | SW 13 | SW 13 | SW 12 | SSW 13 | SW 13 | SW 13 | SW 12 | SW 11 | SW 11 | SW 15 | SW 14 | SW 14 | WSW 13 | SW 14 | SSW 14 | SSW 13 |
Wave Graph | |||||||||||||||||||||
175 | 116 | 104 | 241 | 199 | 171 | 202 | 144 | 313 | 282 | 352 | 272 | 171 | 134 | 226 | 1236 | 1018 | 7004 | 3152 | 3454 | 2148 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | cross-off | glassy | on | cross-off | off | glassy | glassy | glassy | on | glassy | off | cross-on | off | off | cross-off | off | cross-on | cross-on | cross-off |
High Tide | 4:33PM1.54m | 4:40AM1.44m | 5:02PM1.55m | 5:12AM1.41m | 5:34PM1.53m | 5:47AM1.36m | 6:08PM1.49m | 6:26AM1.29m | 6:47PM1.42m | 7:13AM1.20m | 7:37PM1.34m | 8:17AM1.11m | 8:47PM1.25m | ||||||||
Low Tide | 10:19AM0.12m | 10:42PM0.20m | 10:47AM0.13m | 11:13PM0.20m | 11:16AM0.16m | 11:46PM0.22m | 11:48AM0.21m | 00:24AM0.26m | 12:25PM0.29m | 1:08AM0.32m | 1:10PM0.39m | 2:06AM0.40m | 2:11PM0.49m | 3:28AM0.46m | |||||||
7:39 | — | — | 7:37 | — | — | 7:37 | — | — | 7:35 | — | — | 7:35 | — | — | 7:35 | — | — | 7:33 | — | — | |
— | 6:04 | — | — | 6:05 | — | — | 6:05 | — | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 3 | — | — |
Temp °C | 19 | 21 | 19 | 21 | 23 | 20 | 20 | 23 | 18 | 19 | 20 | 16 | 15 | 18 | 14 | 14 | 16 | 15 | 13 | 14 | 12 |
Feels °C | 17 | 18 | 17 | 18 | 20 | 18 | 16 | 20 | 16 | 17 | 18 | 14 | 12 | 15 | 14 | 10 | 11 | 10 | 9 | 10 | 10 |
Swell 1 Height (m) Direction Period (s) | SW 12 | SW 12 | SW 11 | SW 14 | SW 13 | SW 13 | SW 13 | SW 12 | SSW 13 | SW 13 | SW 13 | SW 12 | SW 11 | SW 11 | SW 10 | SW 14 | SW 14 | SW 13 | SW 14 | SSW 14 | SSW 13 |
175 | 116 | 104 | 241 | 199 | 171 | 202 | 144 | 313 | 282 | 352 | 272 | 171 | 134 | 133 | 1236 | 1018 | 2248 | 3152 | 3454 | 2148 | |
Swell 2 Height (m) Direction Period (s) | SE 8 | SW 18 | SW 16 | SE 10 | SE 11 | SE 11 | SE 11 | SSW 16 | SE 14 | SW 15 | SE 12 | SE 11 | SE 11 | SSW 16 | SW 15 | ESE 10 | ESE 10 | — | WSW 13 | — | — |
15 | 12 | 64 | 15 | 18 | 19 | 19 | 137 | 7 | 55 | 5 | 5 | 5 | 25 | 226 | 20 | 10 | — | 2618 | — | — | |
Swell 3 Height (m) Direction Period (s) | W 19 | SW 18 | SE 9 | — | — | S 9 | S 9 | SSE 11 | SW 17 | SE 12 | — | — | S 18 | SE 11 | E 11 | — | — | — | — | — | — |
7 | 78 | 22 | — | — | 6 | 6 | 12 | 11 | 6 | — | — | 6 | 5 | 2 | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | ESE 8 | SE 5 | — | — | — | — | — | — | — | — | — | — | NNW 3 | W 3 | NNW 3 | NNW 4 | NW 5 | WSW 13 | — | — | — |
98 | 7 | — | — | — | — | — | — | — | — | — | — | 1 | 5 | 3 | 21 | 113 | 7004 | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 22 | 0 | 0 | 0 | 0 | 0 | 18 | 0 | 0 | 10 | 0 | 0 | 398 | 160 | 31 | 16 | 12 |
Best forecast wave conditions in Cape Town | |||||||||||||||||||||
Best forecast wave conditions in South Africa | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
Latest Updates
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.











