Onrus Surf Break

Lat Long: 34.41° S 19.17° E

Onrus Surf Forecast and Surf Report

Issued: 7 am 20 Aug 2026 (local time)

Forecast update in  hr  min

Today's Onrus sea temperature is
14.7° C
1.0° 

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


Onrus surf forecast from 20 Aug 2026:

  • Best quality surf: Thursday 20 Aug, 2PM (local time) - 10ft (3.0m), 13s period, SW swell with cross-onshore winds.
  • Most powerful swell: Thursday 20 Aug, 2PM (local time) - 10ft (3.0m), 13s period, SW swell with 2,884 kJ wave energy.
  • Next surfable swell (1★+): Thursday 20 Aug, 2PM (local time) - 10ft (3.0m), 13s 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 Thursday (Aug 20) at 2PM. The primary swell is predicted to be 3.0m and 13s period. The wind is predicted to be cross-onshore as the swell arrives.

The most powerful waves expected at Onrus in the next 16 days are 3.0m 13s and forecast to arrive on Thursday (Aug 20) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 8s period and expected on Thursday (Aug 27) at 8AM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 2PM (Thu 20th Aug)10ft (3.0m) 13s
Best Surf 2PM (Thu 20th Aug)10ft (3.0m) 13s
Most Powerful 2PM (Thu 20th Aug)10ft (3.0m) 13s

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


The Lowdown

Alright, Rusty here. Let’s have a look at what’s on the cards for Onrus over the next couple of weeks.

Alright, so straight off the bat, the first few days are a write-off for us. Thursday morning the 20th has a massive 10-foot SW swell, and the combined energy is pumping at 3475, but it’s just too big for this reef set-up. Even with glassy conditions, it’s a no-go. That carries through the rest of Thursday and into Friday, where the wind gets ugly and the surf quality tanks.

We’ve got a proper dry spell here. Saturday the 22nd and Sunday the 23rd are pretty marginal, with some clean windows but the swell is either too small or the energy is just average (633 to 1584). Monday the 24th and Tuesday the 25th are a total loss – strong cross-onshore winds and lumpy, choppy conditions.

But then, things start to look up. Wednesday the 26th is a real gem. The morning kicks off with a clean 6-foot SW swell, dead calm, glassy water. That’s the kind of morning you wait for. The combined energy is a modest 879, but with that wind, it’ll be smooth and lined up. Afternoon stays glassy with a 4-foot WSW swell. This is the best we’ve seen so far.

Thursday the 27th is still okay, with a tiny 3-foot glassy morning, but it’s on the smaller side. The real standout is the 28th of August, Friday morning. We’ve got a 7-foot WSW groundswell with a long 15-second period, and the energy is cranking at 2064. The wind is a light westerly, glassy, and the conditions are described as excellent for experienced surfers. This is the one to circle on your calendar. That longer period will make the waves at Onrus (a reef break) really stand up and offer some proper shape, but it’ll be a bit more powerful, so leave the foamies at home. The water temp is sitting at 59°, which is about a degree and a half cooler than normal for this time of year, so a decent spring suit is a good idea.

The 29th of August (Saturday) keeps the clean vibes going in the morning with a 5-foot WSW swell, but the wind shifts by the afternoon and messes it up. After that, we get a bit of a rough patch again into the end of the month with strong onshore winds and poor quality surf.

Looking further ahead, the 1st of September has a massive 12-foot SW swell with a combined energy of 4618. That’s way too big for most of us, and only for the experts. The 2nd and 3rd have some cleaner options but with strong offshore winds that make paddling a mission. The 4th of September wraps things up with a small, clean 4-foot SW swell and good conditions – a nice way to end the run.

So, the best bet? That Friday the 28th of August morning session is the clear winner. The Wednesday the 26th is a close second if you want something smaller and more relaxing. For the rest, pick your windows carefully, because the wind is the boss here.

Stay stoked,
Rusty

Short Range Forecast

Mostly dry. Very mild (max 19°C on Fri afternoon, min 9°C on Fri morning). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Warm (max 21°C on Tue afternoon, min 10°C on Mon night). Wind will be generally light.

Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
!
!
2
0
1
3
2
2
3
2
2
3
1
1
1
0
0
0
3
3
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
3
SW
13
3
SW
13
2.3
SW
12
1.9
SW
11
1.3
SSW
11
1.1
WSW
11
1.3
SSW
12
1.6
SW
11
2.2
SW
11
2.2
SW
13
2.2
SW
13
1.9
SW
12
1.8
SW
12
1.2
WSW
11
2.2
SW
15
2.3
SW
14
1.9
SW
13
1.8
SW
13
1.7
SW
12
1.2
WSW
12
1.3
WSW
12
Wave Graph
Metric surfscale
Energy kJ
3475
2369
1422
882
387
291
473
652
1121
1584
1457
1029
857
337
2010
2004
1182
1162
860
426
414
Wind (km/h)
5
E
15
SSE
15
ENE
20
E
15
ESE
10
WSW
20
WNW
15
W
10
E
10
E
15
SSE
10
SE
10
SSE
15
SSE
20
E
25
E
25
ESE
25
ENE
5
NNW
0
WNW
5
ENE
Wind State
glassy
on
cross-on
cross-on
on
cross-off
cross-off
cross-off
cross-on
cross-on
cross-on
on
on
on
cross-on
cross-on
cross-on
cross-on
glassy
glassy
cross-on
High Tide
8:25PM1.07m
9:40AM0.94m
10:21PM1.01m
11:56AM0.98m
00:08AM1.06m
1:01PM1.09m
1:04AM1.17m
1:39PM1.22m
1:42AM1.27m
2:10PM1.34m
2:15AM1.37m
2:38PM1.46m
2:45AM1.46m
Low Tide
1:50PM0.65m
3:11AM0.66m
3:39PM0.74m
5:33AM0.65m
6:08PM0.70m
6:49AM0.56m
7:10PM0.59m
7:30AM0.44m
7:48PM0.48m
8:02AM0.33m
8:19PM0.37m
8:29AM0.23m
8:48PM0.27m
clear
clear
clear
clear
clear
part cloud
clear
cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:16
7:16
7:15
7:13
7:13
7:11
7:09
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:15
6:15
6:16
6:17
6:17
6:19
6:20
 mm
Temp °C
14
15
13
14
19
15
17
17
14
15
16
13
15
16
13
15
21
16
26
26
21
Feels °C
13
13
11
10
16
13
12
13
13
13
13
12
13
14
10
10
16
12
25
23
21
  • 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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