Onrus Surf Break

Lat Long: 34.41° S 19.17° E

Onrus Surf Forecast and Surf Report

Issued: 7 pm 19 Aug 2026 (local time)

Forecast update in  hr  min

Today's Onrus sea temperature is
14.6° C
1.1° 

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


Onrus surf forecast from 19 Aug 2026:

  • Best quality surf: Thursday 20 Aug, 5AM (local time) - 10ft (3.0m), 13s period, SW swell with glassy winds.
  • Most powerful swell: Thursday 20 Aug, 8AM (local time) - 11ft (3.5m), 13s period, SW swell with 3,697 kJ wave energy.
  • Next surfable swell (1★+): Thursday 20 Aug, 2AM (local time) - 8ft (2.5m), 12s 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 2AM. The primary swell is predicted to be 2.5m and 12s period. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Onrus in the next 16 days are 3.5m 13s and forecast to arrive on Thursday (Aug 20) at 8AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 5s period and expected on Wednesday (Aug 26) at 8PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 2AM (Thu 20th Aug)8ft (2.5m) 12s
Best Surf 5AM (Thu 20th Aug)10ft (3.0m) 13s
Most Powerful 8AM (Thu 20th Aug)11ft (3.5m) 13s

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


The Lowdown

Alright folks, Rusty here. Let’s take a look at what’s cooking at Onrus over the next couple of weeks.

We’ve got some serious swell on the cards, but it’s a bit of a mixed bag. The real standout is going to be the morning of Thursday the 20th of August. The water temp is sitting pretty average for this time of year, so no surprises there. That morning, we’re looking at a solid 10 ft SW groundswell with a long 13-second period, and it’s bringing a massive 3475 units of energy. The wind is dead glassy from the ESE, which is almost offshore here. That’s a recipe for some absolutely perfect, clean reef waves. The only catch is that 10 ft is expert territory, and this spot is a bit inconsistent, so you’ll need to be patient. It’s a big, powerful swell, but if you’ve got the skills, it’s going to be memorable.

Thursday afternoon still has the same 10 ft SW swell, but the wind shifts to a moderate onshore breeze, so it’ll get a bit choppy. Still a big energy day (2369 units), but the conditions won’t be as pristine.

The next real window of opportunity looks like Saturday morning, the 22nd of August. The swell has dropped to a more manageable 4 ft from the SSW, with a 12-second period. The energy is moderate (611 units), but the magic is in the wind: a solid offshore from the WNW. That’s going to groom the reef beautifully. Expect clean, well-shaped waves. It’s a good intermediate-friendly size, but keep in mind Onrus is a reef break and can be inconsistent.

There’s a bit of a gap after that, but Wednesday the 26th of August is worth a look. The morning session has a 6 ft SW swell (12-second period, 827 units of energy) with a light cross-offshore breeze, keeping things clean. The afternoon is even better: 5 ft from the WSW, glassy conditions, and very good surf potential. You’ll want to be on it for that glass-off window.

Heading into the end of the month, the morning of Monday the 31st of August is another big one. That’s a massive 12 ft WSW groundswell, again with a 13-second period and a whopping 4003 units of energy. The wind is light and cross-shore, but the size is purely for experts. The surf is there, but it’s a knife-edge.

The start of September brings more size. Tuesday morning, the 1st of September, has a 10 ft WSW swell with a strong offshore NW wind, keeping it clean. Again, this is for the big-wave crew only. The wind cranks up to 22 mph though, so it'll be a battle.

By Wednesday the 3rd of September, things settle down nicely. The afternoon session offers a 5 ft WSW swell, a light cross-offshore breeze, and very good surf conditions. It’s a great way to finish the run.

So, to sum it up: the absolute best of the best is Thursday morning, the 20th of August, if you’re an expert. For the rest of us, Saturday the 22nd of August morning and Wednesday the 26th of August afternoon are the standouts for clean, ridable waves. The second week is sketchy with big, windy days, but the 3rd of September offers a final clean-up.

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 5-7 Weather Summary

Mostly dry. Warm (max 21°C on Tue afternoon, min 11°C on Mon night). Wind will be generally light.

Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
4
!
!
2
1
0
3
3
2
4
3
2
3
3
1
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)
2.5
SW
12
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
2.1
SW
11
2.2
SW
13
2.2
SW
12
1.9
SW
12
1.7
SW
12
0.9
SW
14
2.1
SW
15
2.3
SW
14
2.1
SW
14
1.8
SW
13
Wave Graph
Metric surfscale
Energy kJ
1991
3475
2369
1422
882
387
291
451
579
1017
1503
1411
1029
781
320
1889
2090
1657
1092
Wind (km/h)
5
NNW
5
ESE
15
SSE
15
ENE
20
E
20
SE
10
WSW
15
WNW
20
W
5
SE
5
ESE
10
S
10
ESE
10
SSE
15
SSE
20
ENE
25
E
25
E
20
ENE
Wind State
glassy
glassy
on
cross-on
cross-on
on
cross-off
off
cross-off
glassy
cross-on
cross-on
on
on
on
cross-on
cross-on
cross-on
cross-on
High Tide
7:59AM1.02m
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
Low Tide
1:50AM0.57m
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
clear
clear
clear
clear
clear
clear
part cloud
clear
part cloud
part cloud
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
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:15
6:15
6:15
6:16
6:17
6:17
6:19
 mm
Temp °C
13
14
15
12
14
19
15
17
18
15
15
16
13
15
16
13
16
21
18
Feels °C
11
13
13
9
10
16
12
13
13
14
15
14
12
13
13
10
10
15
14
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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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