Nine Mile Reef Surf Break

Lat Long: 34.07° S 18.66° E

Nine Mile Reef Surf Forecast and Surf Report

Issued: 1 am 13 Aug 2026 (local time)

Forecast update in  hr  min

Today's Nine Mile Reef sea temperature is
13.8° C
1.7° 

Nine Mile Reef surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


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 TypeTime (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 Powerful11AM (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 Forecast

Mostly dry. Warm (max 25°C on Thu afternoon, min 13°C on Fri night). Wind will be generally light.

Days 4-6 Weather Summary

Mostly 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
Rating
(10 max)
4
3
3
2
2
2
2
1
2
1
3
3
2
2
3
3
1
!
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.5
SW
18
1.3
SW
16
1.1
SW
16
0.9
SW
15
0.9
SW
15
0.9
SW
14
0.9
SW
14
0.9
SW
13
0.9
WSW
14
0.9
WSW
15
1.1
SW
15
1.5
SW
14
1.3
WSW
13
1.3
SW
13
1.2
SW
13
1.2
SW
12
1.1
SW
12
2.1
SW
12
1.6
WSW
11
1.2
SW
11
1.8
SSE
6
Wave Graph
Metric surfscale
Energy kJ
1327
943
611
360
355
308
264
257
328
372
503
840
581
569
488
430
367
1229
592
360
215
Wind (km/h)
10
NNE
15
NNW
15
N
25
N
15
NW
10
NE
5
S
5
S
10
NNW
15
NNW
10
NW
5
N
5
S
10
SSE
5
NNW
10
NW
15
SSW
20
SSE
25
SE
25
SE
15
ESE
Wind State
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
clear
clear
clear
clear
part cloud
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
part cloud
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:26
7:26
7:24
7:24
7:22
7:20
7:20
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
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
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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.

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