Onrus Surf Break

Lat Long: 34.41° S 19.17° E

Onrus Surf Forecast and Surf Report

Issued: 1 pm 26 Aug 2026 (local time)

Forecast update in  hr  min

Today's Onrus sea temperature is
15.2°C
0.5° 

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


Onrus surf forecast from 26 Aug 2026:

  • Best quality surf: Tuesday 1 Sep, 5AM (local time) - 10ft (3.0m), 13s period, WSW swell with offshore winds.
  • Most powerful swell: Tuesday 1 Sep, 8PM (local time) - 13ft (4.0m), 14s period, SW swell with 5,502 kJ wave energy.
  • Next surfable swell (1★+): Thursday 27 Aug, 5AM (local time) - 5ft (1.5m), 12s period with S 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 Thursday (Aug 27) at 5AM. The primary swell is predicted to be 1.5m and 12s period with a secondary swell of 0.8m and 12s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Onrus in the next 16 days are 4.0m 14s and forecast to arrive on Tuesday (Sep 01) at 8PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 8s period and expected on Wednesday (Aug 26) at 11PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Thu 27th Aug)5ft (1.5m) 12s
Best Surf 5AM (Tue 1st Sep)10ft (3.0m) 13s
Most Powerful 8PM (Tue 1st Sep)13ft (4.0m) 14s

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


The Lowdown

Alright, Rusty here. Let’s talk about what’s coming up at Onrus.

First up, a heads-up: the water temperature is sitting at 15°, which is about average for this time of year, so nothing too wild on that front.

The forecast starts off a bit rough. Wednesday the 26th is a write-off with a strong cross-onshore wind making things lumpy and messy – definitely not one for the board. You’ll want to wait until Thursday the 27th. That morning, we’ve got glassy conditions with a 5ft swell from the S, period at 12 seconds, and the combined energy is strong at 1117. It’s excellent surf for experienced surfers – clean, with a bit of power. The afternoon stays clean too, with a cross-offshore breeze and a 5ft swell.

Friday the 28th is still decent, especially the morning with glassy conditions and a 4ft S swell (493 energy). It’s more mellow but clean. Saturday the 29th morning looks good again – clean, cross-off wind, 3ft swell from the WSW (635 energy). But Saturday afternoon gets messy with a rising wind and a 6ft swell, so that’s a pass.

Sunday the 30th has some size – 8ft in the morning, but it’s cross-shore and a bit lumpy, not the cleanest. By Monday the 31st, we’re back to clean conditions with a cross-off breeze and a 6ft swell from the SW (865 energy). That’s a solid session for intermediates.

Now, here’s the standout: Tuesday the 1st of September. The swell jumps to 10ft from the SW, with a period of 14 seconds, and the combined energy is a massive 3893. That’s a serious groundswell. The wind is fresh offshore from the NNW, so it’ll be clean. But fair warning – at 10ft, this is for experts only. The reef setup at Onrus should handle it, but it’s not a day for the faint-hearted. The afternoon is even bigger at 13ft, so if you’re skilled enough, that’s the pick of the whole forecast.

After that, the surf quality drops fast. From Wednesday the 2nd through to Saturday the 5th, it’s mostly onshore wind, choppy, and messy. There’s a lot of size (10ft to 12ft), but the wind kills it. Sunday the 6th stays poor. You’ll get a brief window on Monday the 7th – glassy and clean, with a small 3ft swell from the SW – but it’s tiny. The rest of the second week is mostly marginal, with a few cleaner moments but nothing that really stands out. By Thursday the 10th, we’re looking at another 12ft SW swell with clean wind, but again, that’s expert territory and the wind is onshore from the SE, so it’s not ideal.

Overall, the best bet is Thursday the 27th morning for a clean, fun session, and Tuesday the 1st of September for the big, expert-level groundswell. The first week has more to offer than the second, which fades into smaller, messier conditions.

Stay safe, and keep an eye on that Tuesday swell.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 22°C on Thu morning, min 14°C on Fri night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 9mm), mostly falling on Sat night. Very mild (max 16°C on Sat afternoon, min 11°C on Sat night). Wind will be generally light.

Wed
26
Thursday
27
Friday
28
Saturday
29
Sunday
30
Monday
31
Tuesday
1
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
2
4
3
3
2
2
1
3
3
4
4
3
3
2
2
4
!
!
!
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1
SSW
16
1.5
S
11
1.5
S
12
1.4
S
11
1.3
S
11
1.1
S
11
0.8
WSW
14
1
WSW
13
1.1
WSW
13
1.6
WSW
14
1.3
WSW
13
2.1
WSW
13
2.1
WSW
12
1.9
WSW
12
1.8
WSW
11
1.7
WSW
11
2.5
WSW
11
3.5
WSW
13
3.5
SW
13
3.5
SW
13
Wave Graph
Metric surfscale
Energy kJ
475
596
628
501
410
279
239
307
408
1042
624
1383
1277
947
829
713
1463
4519
4233
4398
Wind (km/h)
20
E
10
NE
5
W
5
WSW
5
WSW
0
SW
5
SSW
10
SSW
5
S
10
SW
15
WNW
10
WNW
10
SSW
0
N
20
W
20
W
15
NNW
25
WNW
35
WNW
20
NW
Wind State
cross-on
cross
glassy
cross-off
glassy
glassy
cross
cross-on
glassy
cross
off
cross-off
cross-on
glassy
cross-off
cross-off
off
off
cross-off
off
High Tide
2:38PM1.46m
2:45AM1.46m
3:06PM1.56m
3:15AM1.52m
3:34PM1.64m
3:45AM1.55m
4:02PM1.68m
4:16AM1.55m
4:32PM1.68m
4:48AM1.52m
5:04PM1.65m
5:22AM1.46m
5:38PM1.57m
Low Tide
8:48PM0.27m
8:56AM0.15m
9:17PM0.18m
9:23AM0.10m
9:46PM0.12m
9:50AM0.07m
10:15PM0.09m
10:19AM0.07m
10:46PM0.09m
10:49AM0.11m
11:19PM0.13m
11:22AM0.18m
11:55PM0.20m
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
cloud
cloud
cloud
rain showers
rain showers
clear
clear
part cloud
clear
clear
clear
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:09
7:07
7:05
7:05
7:03
7:01
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:20
6:21
6:21
6:22
6:22
6:22
6:23
 mm
8
1
Temp °C
21
20
22
21
16
19
20
16
16
16
12
14
14
13
14
15
13
16
17
15
Feels °C
17
16
20
19
16
19
19
15
16
15
7
12
11
11
10
10
10
10
9
10
  • Map Icons:
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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 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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