Onrus Surf Break

Lat Long: 34.41° S 19.17° E

Onrus Surf Forecast and Surf Report

Issued: 1 pm 12 Aug 2026 (local time)

Forecast update in  hr  min

Today's Onrus sea temperature is
14.5° 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 12 Aug 2026:

  • Best quality surf: Thursday 13 Aug, 11AM (local time) - 7ft (2.1m), 17s period, SW swell with cross-offshore winds.
  • Most powerful swell: Thursday 13 Aug, 11AM (local time) - 7ft (2.1m), 17s period, SW swell with 2,719 kJ wave energy.
  • Next surfable swell (1★+): Thursday 13 Aug, 11AM (local time) - 7ft (2.1m), 17s 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 13) at 11AM. The primary swell is predicted to be 2.1m and 17s period. 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 2.1m 17s and forecast to arrive on Thursday (Aug 13) at 11AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 10s period and expected on Thursday (Aug 13) at 11PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+)11AM (Thu 13th Aug)7ft (2.1m) 17s
Best Surf11AM (Thu 13th Aug)7ft (2.1m) 17s
Most Powerful11AM (Thu 13th Aug)7ft (2.1m) 17s

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


The Lowdown

Alright, folks, Rusty here. Let’s get into what the next couple of weeks look like for Onrus.

We’re starting off a bit rough, with some lumpy cross-onshore winds that just aren't going to give us anything worthwhile on Wednesday. You’re better off staying on land for that first day. The real start of the action kicks off on Thursday morning the 13th.

Thursday the 13th is where things get interesting. We’ve got a solid 7 ft SW groundswell rolling in with a long 17-second period, and it’s got some serious juice behind it – the combined energy is up there (2719). What makes it a standout is that the wind is a light, clean cross-offshore breeze out of the NE. For a reef break like Onrus, that’s the recipe for some lined-up, clean waves. The water is sitting at 58°, which is a bit colder than normal for this time of year, so you’ll want a good 4/3. This is the pick of the first week for experienced surfers. Friday morning the 14th also looks excellent, with 5 ft of clean WSW groundswell and light offshore WNW winds – another great session for the crew that knows what they’re doing.

The weekend (15th–16th) settles down a bit with smaller waves in the 5 ft to 6 ft range, but Saturday afternoon has a magical moment of glassy conditions with some clouds overhead. Sunday is clean but gets a bit blown out by strong cross-offshore winds, so pick your windows.

We hit a rough patch from Monday the 17th through to the start of the next week. The wind gets messy and onshore, with strong easterlies making a mess of the 8 ft to 8 ft SW swells. By the 23rd, the swell is pumping up to 12 ft with a combined energy reading of (7022), but with a howling 15-19 mph cross-onshore wind, that’s a washing machine. That kind of power and wind combo is really more for the kite surfers than paddle surfers at a beach setup. It’s a long stretch of poor conditions until we see a light at the end of the tunnel.

Looking out to the last week of the period, Tuesday the 25th is a quiet one with only 4 ft of swell, but pay attention to the period – a massive 20 seconds. That’s very long-period groundswell, prone to standing up and walling up. On a reef break like Onrus, that’s a beautiful thing. The wind is a clean cross-offshore out of the W, and the energy is still punching well above its weight (2181). It’s a long-range call, so less certain, but if it lines up it will be a true standout. Then Wednesday the 26th brings a bigger 7 ft SW groundswell back into the picture with light offshore winds. Both of those morning sessions look excellent for experienced surfers.

So, if you’re looking for the best bets: lock in Thursday morning the 13th for the combo of size, power, and calm wind. For the second week, keep an eye on Tuesday the 25th for that weird, clean, long-period magic.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 25°C on Thu afternoon, min 13°C on Fri night). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Very mild (max 19°C on Sat afternoon, min 14°C on Sun morning). Wind will be generally light.

Wed
12
Thursday
13
Friday
14
Saturday
15
Sunday
16
Monday
17
Tuesday
18
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
2
4
4
3
3
2
3
3
2
3
4
3
1
4
4
3
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.7
SW
18
1.9
SW
16
2.1
SW
17
2
SW
16
1.8
SW
16
1.6
WSW
15
1.5
WSW
15
1.6
WSW
14
1.6
WSW
13
1.6
WSW
13
1.6
WSW
14
1.6
WSW
14
1.7
WSW
14
2.3
WSW
14
2.3
WSW
13
2.2
WSW
13
1.9
WSW
13
1.8
WSW
12
1.7
WSW
12
1.2
WSW
11
Wave Graph
Metric surfscale
Energy kJ
1741
1899
2719
2058
1513
1102
974
889
863
824
947
907
1114
1893
1876
1734
1207
967
850
343
Wind (km/h)
20
ENE
25
NE
15
NNE
10
ENE
10
N
10
WNW
15
W
10
NE
5
E
5
S
10
NW
20
W
20
W
5
N
10
ESE
15
SSE
0
WSW
10
WSW
10
WSW
10
SSE
Wind State
cross-on
cross
cross-off
cross-on
cross-off
off
cross-off
cross-off
cross-on
glassy
off
cross-off
cross-off
cross-off
cross-on
on
glassy
cross-off
cross-off
on
High Tide
3:16PM1.67m
3:31AM1.61m
3:54PM1.73m
4:09AM1.60m
4:31PM1.74m
4:46AM1.55m
5:06PM1.69m
5:21AM1.47m
5:39PM1.60m
5:55AM1.37m
6:12PM1.47m
6:30AM1.25m
6:46PM1.33m
Low Tide
9:30PM0.07m
9:42AM-0.00m
10:10PM0.04m
10:18AM0.00m
10:47PM0.05m
10:52AM0.06m
11:23PM0.12m
11:25AM0.15m
11:57PM0.21m
11:56AM0.26m
00:31AM0.33m
12:28PM0.39m
1:06AM0.45m
clear
clear
clear
clear
clear
clear
part cloud
clear
clear
part cloud
part cloud
clear
clear
part cloud
part cloud
clear
part cloud
clear
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:24
7:24
7:22
7:22
7:20
7:20
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:09
6:10
6:10
6:12
6:13
6:13
6:14
 mm
Temp °C
20
16
21
25
22
20
20
15
17
19
17
18
19
16
17
18
15
16
16
14
Feels °C
15
11
18
23
20
16
15
13
16
18
17
15
14
13
16
16
14
14
13
13
  • 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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