Onrus Surf Break

Lat Long: 34.41° S 19.17° E

Onrus Surf Forecast and Surf Report

Issued: 1 pm 29 Aug 2026 (local time)

Forecast update in  hr  min

Today's Onrus sea temperature is
14.9°C
0.8° 

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


Onrus surf forecast from 29 Aug 2026:

  • Best quality surf: Tuesday 1 Sep, 8PM (local time) - 10ft (3.0m), 13s period, SW swell with glassy winds.
  • Most powerful swell: Wednesday 2 Sep, 2AM (local time) - 10ft (3.0m), 14s period, SW swell with 3,674 kJ wave energy.
  • Next surfable swell (1★+): Monday 31 Aug, 11PM (local time) - 6ft (1.8m), 11s period with SW swell.

Best Forecast Surf Conditions for Onrus this week:

The surf forecast for Onrus over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Aug 31) at 11PM. The primary swell is predicted to be 1.8m and 11s period with a secondary swell of 0.9m and 13s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Onrus in the next 16 days are 3.0m 14s and forecast to arrive on Wednesday (Sep 02) at 2AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.1m 11s period and expected on Tuesday (Sep 01) at 5AM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+)11PM (Mon 31st Aug)6ft (1.8m) 11s
Best Surf 8PM (Tue 1st Sep)10ft (3.0m) 13s
Most Powerful 2AM (Wed 2nd Sep)10ft (3.0m) 14s

Table - best surf conditions forecast for Onrus over the next 16 days.


The Lowdown

Alright folks, Rusty here with a look at the next couple of weeks. Let's talk about what's coming our way for Onrus.

We’ve got a bit of a slow start, but hold on, because there’s some serious juice on the way. The first decent window opens up on Saturday afternoon, the 29th of August, but it’s marginal, so don't get too excited just yet.

The real story starts to build on Tuesday, the 1st of September. We’ve got a meaty SW groundswell filling in with a 13-second period and solid 8ft of swell. The wind early is a cross-offshore breeze, which should clean things up nicely. The water temp is sitting around 59°, which is just a touch cooler than average for this time of year, so a good 4/3 will be your friend. The energy in the water is kicking off, with a combined energy reading of (1915) – that’s moderate to strong power. Tuesday afternoon looks like the pick of that day, with the swell bumping up to 8ft and the wind easing to a light cross-off. This is quality, powerful surf for the experienced crew.

Now, Wednesday the 2nd of September is the standout. The morning is looking very interesting with a big 10ft SW swell, backed by a 13-second period. That’s a lot of water moving. The combined energy is pumping at (2975). However, the wind is a cross-onshore, so it's going to be a bit bumpy and challenging. This is expert-only territory – those 9ft+ sets are no joke, and the wind is going to add some grunt to the faces. After that, it's a write-off for a while. A massive low-pressure system and a strong onshore fetch blow through, trashing conditions from Thursday through the following week. We’re looking at a solid 9-day gap with strong, messy winds and nothing worth paddling for. The swell drops right off, and any energy that’s left is just blown out.

The next glimmer of hope shows up on Thursday the 10th of September. The morning looks promising with a clean, cross-off wind and a 4ft SW swell. But the real diamond in the rough is Thursday afternoon. The wind goes glassy – dead calm – with a clean 6ft SW swell wrapping in from a 13-second period. The water will be like a mirror. This is the moment for the patient surfer. The energy is solid at (1380) and the conditions will be absolutely pristine. Perfect for the intermediate and above, but the sets will be clean and fun.

So, to wrap it up: if you’re an experienced surfer, Tuesday the 1st of September morning is a solid choice. If you want the absolute best conditions, you wait for that glassy Thursday afternoon on the 10th. The rest of the window is a write-off until then. Keep an eye on the long-range forecast for the 10th, though – it’s promising, but things can change.

Stay stoked.

Rusty

Short Range Forecast

Some drizzle, heaviest during Sat afternoon. Very mild (max 15°C on Sat afternoon, min 9°C on Sun night). Winds decreasing (fresh winds from the SW on Sat afternoon, calm by Mon night).

Days 5-7 Weather Summary

Heavy rain (total 24mm), heaviest during Thu morning. Very mild (max 18°C on Wed afternoon, min 11°C on Thu morning). Winds increasing (calm on Tue night, strong winds from the ESE by Fri morning).

Sat
29
Sunday
30
Monday
31
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
3
2
1
0
3
2
1
4
4
4
!
!
0
0
0
0
0
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)
2.1
SW
10
2
SW
9
2.4
SW
12
2.2
SW
12
2.1
SW
12
1.8
SW
11
1.8
SW
11
2.1
SW
11
2.4
SW
13
2.5
SW
13
3
SW
14
3
SW
13
2.5
SW
13
2.4
SW
13
1.8
SW
12
1.6
WSW
12
1.9
SW
12
1.8
SSW
11
1.2
SW
11
1.2
SSW
10
Wave Graph
Metric surfscale
Energy kJ
832
621
1768
1369
1162
828
752
1087
1915
2429
3674
2975
2390
1886
996
703
913
759
334
274
Wind (km/h)
20
WSW
15
SSE
15
SE
20
SSE
15
NE
5
SSE
10
S
5
NW
15
WSW
10
W
10
E
15
E
25
SSE
30
SE
30
ESE
30
E
40
ESE
45
ESE
55
ESE
40
E
Wind State
cross-off
cross-on
on
cross-on
cross
on
cross-on
glassy
cross-off
cross-off
cross-on
cross-on
on
on
on
cross-on
on
cross-on
cross-on
cross-on
High Tide
4:02PM1.68m
4:16AM1.55m
4:32PM1.68m
4:48AM1.52m
5:04PM1.65m
5:22AM1.46m
5:38PM1.57m
6:00AM1.36m
6:18PM1.46m
6:47AM1.24m
7:09PM1.32m
7:53AM1.12m
8:28PM1.19m
Low Tide
10:15PM0.09m
10:19AM0.07m
10:46PM0.09m
10:49AM0.11m
11:19PM0.13m
11:22AM0.18m
11:55PM0.20m
11:59AM0.29m
00:39AM0.31m
12:45PM0.42m
1:37AM0.44m
1:53PM0.55m
3:13AM0.54m
light rain
part cloud
part cloud
clear
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
rain showers
heavy rain
rain showers
clear
clear
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:05
7:03
7:01
7:01
7:00
6:58
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:22
6:22
6:22
6:23
6:24
6:24
6:25
 mm
1
5
18
1
Temp °C
15
14
14
14
12
12
14
11
14
15
14
15
18
15
12
13
14
15
16
14
Feels °C
10
10
9
9
8
10
11
9
11
12
13
12
14
12
6
7
6
6
6
4
  • 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 Onrus Surf forecast

The above surf forecast table for Onrus provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Onrus can be found by selecting the local surf guide option on the grey menu. Our Onrus 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 (Onrus) 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 Onrus 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.

Onrus is 6 km (4 miles) from Hermanus. If you plan a holiday in Overberg, look for hotels and other accommodation in Hermanus. Hermanus has rooms for a wide range of budgets as well as car hire and transport links.

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