Onrus Surf Break

Lat Long: 34.41° S 19.17° E

Onrus Surf Forecast and Surf Report

Issued: 1 pm 23 Aug 2026 (local time)

Forecast update in  hr  min

Today's Onrus sea temperature is
15.0°C
0.7° 

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


Onrus surf forecast from 23 Aug 2026:

  • Best quality surf: Sunday 30 Aug, 8PM (local time) - 10ft (3.0m), 13s period, W swell with offshore winds.
  • Most powerful swell: Sunday 30 Aug, 8PM (local time) - 10ft (3.0m), 13s period, W swell with 3,354 kJ wave energy.
  • Next surfable swell (1★+): Thursday 27 Aug, 8AM (local time) - 5ft (1.5m), 11s 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 8AM. The primary swell is predicted to be 1.5m and 11s 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 3.0m 13s and forecast to arrive on Sunday (Aug 30) 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 1.9m 8s period and expected on Thursday (Aug 27) at 2AM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Thu 27th Aug)5ft (1.5m) 11s
Best Surf 8PM (Sun 30th Aug)10ft (3.0m) 13s
Most Powerful 8PM (Sun 30th Aug)10ft (3.0m) 13s

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


The Lowdown

Alright, Rusty here.

Right now, Onrus is pretty flat and not worth paddling out for. We’ve got a blank run from today straight through to early next week. The swell is there, but the wind is just trashing it. We’re looking at a stretch of poor conditions up until Thursday the 27th of August, so sit tight for a few days.

The first real window opens up on Thursday the 27th of August morning. It’s not going to be huge, but it’ll be clean. The wind goes glassy – a light WNW breeze, just a whisper. We’ve got a 4.6ft SSW swell rolling in with an 11-second period, and the combined energy is moderate at 831. The water temp is sitting at 59.0°F, which is about average for this time of year. The rip at Onrus is a reef break, so that longer period should wrap in nicely. If you can get out, Thursday morning and afternoon both look glassy and fun, even if the size is modest.

Friday the 28th drops off pretty quick, turning marginal and onshore. Not worth it.

Now check this out: Saturday the 29th of August morning, the wind turns offshore out of the NW at 15 mph. We’ve got a 3.3ft WSW groundswell, period of 13 seconds, clean lines. The energy is light at 512, but with clean offshore wind on a reef, it’ll be a fun little session, uncrowded likely. This could be a sneaky good, small-wave morning. Saturday afternoon gets a bit more size, 8.2ft, but the period drops to 7 seconds – short period windswell – and the wind cranks to 25 mph. Hard to paddle into, that one.

The real standout, the one you should circle on your calendar, is Monday the 31st of August morning. Moderate offshore wind from the NW at 12 mph, a clean 7.9ft WSW swell with a 12-second period. Combined energy is strong at 2063. For a reef like Onrus, that’s quality. The sets will have push, the faces will be clean, and the crowd will be manageable. This is excellent for experienced surfers.

Tuesday the 1st of September morning keeps that quality going with 8.2ft at 10 seconds, still offshore. From Tuesday afternoon onwards, the swell just keeps pumping, but it gets too big for Onrus. By Wednesday the 2nd, we’re looking at 11.5ft to 13.1ft swell – that’s expert-only territory, and the system is cranking. The energy figures go through the roof, hitting 3993 and 4573. If you’re a competent charger, that’s a serious push, but for everyone else, it’s going to be a washing machine.

Towards the end of the second week, Saturday the 5th of September morning looks ridiculous for size – 14.8ft SW groundswell at 15 seconds, combined energy of 9717 – but again, way too big for this break. Sunday the 6th gets messy with onshore wind.

So, to cut it short: skip the first few days, get on Thursday 27th for the glassy clean-up, but the true standout is Monday 31st August morning. That’s your session. Later in the week, it gets too big unless you’re a real charger.

Short Range Forecast

Mostly dry. Very mild (max 18°C on Tue afternoon, min 10°C on Mon night). Winds increasing (light winds from the ESE on Sun night, strong winds from the E by Wed morning).

Days 5-7 Weather Summary

Mostly dry. Warm (max 25°C on Fri afternoon, min 13°C on Wed night). Winds decreasing (fresh winds from the E on Wed afternoon, calm by Thu morning).

Sun
23
Monday
24
Tuesday
25
Wednesday
26
Thursday
27
Friday
28
Saturday
29
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
2
2
1
1
1
0
0
0
0
1
3
3
3
1
0
2
3
2
3
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
WSW
13
1.9
WSW
12
1.7
WSW
11
1.4
SSW
11
2.3
SW
14
2.4
SW
14
2.3
SW
14
2.1
SW
13
1.3
WSW
13
0.9
SSW
16
1.6
S
11
1.4
SSW
11
1.4
S
11
1.3
S
11
1.2
S
11
0.8
WSW
14
0.7
SW
14
1
WSW
13
2.5
W
7
1.4
WSW
14
Wave Graph
Metric surfscale
Energy kJ
1385
988
706
425
2216
2358
2006
1514
512
397
630
522
483
410
332
239
206
321
554
765
Wind (km/h)
10
S
10
ENE
10
SE
15
SSE
15
E
20
E
30
ESE
25
E
40
E
35
E
15
ENE
5
WNW
5
SW
5
W
10
SE
20
ESE
5
N
20
NW
35
WNW
15
NW
Wind State
cross-on
cross-on
on
cross-on
cross-on
cross-on
on
cross-on
cross-on
cross-on
cross
glassy
glassy
glassy
on
on
cross-off
off
off
off
High Tide
1:04AM1.17m
1:39PM1.22m
1:42AM1.27m
2:10PM1.34m
2:15AM1.37m
2:38PM1.46m
2:45AM1.46m
3:06PM1.56m
3:15AM1.52m
3:34PM1.64m
3:45AM1.55m
4:02PM1.68m
4:16AM1.55m
Low Tide
7:10PM0.59m
7:30AM0.44m
7:48PM0.48m
8:02AM0.33m
8:19PM0.37m
8:29AM0.23m
8:48PM0.27m
8:56AM0.15m
9:17PM0.18m
9:23AM0.10m
9:46PM0.12m
9:50AM0.07m
10:15PM0.09m
clear
clear
clear
clear
clear
clear
clear
clear
cloud
clear
clear
part cloud
cloud
part cloud
part cloud
cloud
part cloud
part cloud
clear
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:13
7:11
7:09
7:09
7:07
7:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:17
6:17
6:19
6:20
6:21
6:21
6:22
 mm
1
Temp °C
16
12
15
17
12
15
18
13
15
20
16
20
21
16
21
25
21
25
23
17
Feels °C
14
11
13
14
10
12
13
8
8
15
14
19
19
15
17
21
19
20
14
12
  • 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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