Nine Mile Reef surfForecast / Cape Town / South Africa

information circle12 Day Weather and Surf, issued 7 am Thursday 18 Dec 2025 SAST
Forecast update in hr  min  s Forecast update imminent
Nine Mile Reef surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Nine Mile Reef sea temperature is
18.8° C
(Which is normal for this time of year)


Best Forecast Surf Conditions for Nine Mile Reef this week:

The surf forecast for Nine Mile Reef over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Dec 22) at 5AM. The primary swell is predicted to be 1.1m and 7s period with a secondary swell of 0.6m and 11s. Another secondary swell of 0.4m and 10s is also forecast. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Nine Mile Reef in the next 12 days are 1.7m 14s and forecast to arrive on Saturday (Dec 20) at 2PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 11s period and expected on Friday (Dec 19) at 8PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Mon 22nd Dec)3.5ft (1.1m) 7s
Best Surf 8AM (Mon 22nd Dec)6ft (1.8m) 8s
Most Powerful 2PM (Sat 20th Dec)5.5ft (1.7m) 14s

Table - best surf conditions forecast for Nine Mile Reef over the next 12 days.

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Mostly dry. Warm (max 27°C on Sat afternoon, min 16°C on Thu night). Winds increasing (light winds from the SE on Thu morning, strong winds from the SSE by Sat afternoon).

Days 3-6 Weather Summary Light rain (total 2mm), mostly falling on Mon night. Warm (max 31°C on Sun afternoon, min 17°C on Tue night). Winds increasing (calm on Sun night, fresh winds from the SSE by Tue afternoon).

Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
1
SSE
1.3
SSE
1.3
SSE
1.2
SSE
0.7
SSW
1.6
SSW
1.7
SSW
1.7
SSW
1.4
SSW
1.2
SSW
2.4
SE
1.3
SE
0.6
SW
0.9
SSE
0.7
S
0.8
SSW
1.3
S
1.6
SSE
1.5
S
2.1
SSE
1.2
SSE
Period(s) (?)9101111131214141312771199667888
Wave
Graph
(?)Metric surfscale
Energy kJ (?)17738540033415171510831099630359579151761417850130261298549183
Wind
(km/h)
25
S
35
S
20
SSE
25
S
35
S
20
SE
25
SSE
45
SSE
20
ESE
10
SSE
25
SSE
10
ESE
15
W
10
WSW
15
S
25
S
40
SSE
15
SE
25
S
30
S
15
SSE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
ononcross-
on
ononcross-
on
cross-
on
cross-
on
cross-
on
cross-
on
oncrosscrosscross-
on
onononcross-
on
ononon
High Tide
/ height (m)
2:18PM
1.36
2:50AM
1.33
2:53PM
1.39
3:23AM
1.37
3:27PM
1.41
3:57AM
1.39
4:01PM
1.40
4:31AM
1.40
4:34PM
1.38
5:06AM
1.40
5:09PM
1.35
5:42AM
1.40
5:47PM
1.30
Low Tide
/ height (m)
8:17AM
0.38
8:41PM
0.23
8:52AM
0.34
9:14PM
0.20
9:26AM
0.32
9:46PM
0.18
10:00AM
0.31
10:17PM
0.18
10:34AM
0.32
10:49PM
0.19
11:10AM
0.34
11:22PM
0.22
11:48AM
0.36
11:57PM
0.26
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Sunrise5:28--5:28--5:28--5:30--5:30--5:31--5:31--
Sunset-7:53--7:53--7:54--7:55--7:55--7:57--7:57-
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
rain showers
clear
part cloud
clear
clear
clear
clear
Rain (mm)
--------------2------
Temp. °C202018222219262723293126282521222320222119
Feels °C (?)151413181614212119282824272423191816191716
  • Map Icons:
  • Break
  • 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 12 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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