Onrus Surf Break

Lat Long: 34.41° S 19.17° E

Onrus Surf Forecast and Surf Report

Issued: 7 am 25 Aug 2026 (local time)

Forecast update in  hr  min

Today's Onrus sea temperature is
15.1°C
0.6° 

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


Onrus surf forecast from 25 Aug 2026:

  • Best quality surf: Thursday 27 Aug, 8AM (local time) - 5ft (1.5m), 12s period, S swell with offshore winds.
  • Most powerful swell: Tuesday 25 Aug, 2PM (local time) - 8ft (2.4m), 14s period, SW swell with 2,326 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 2.4m 14s and forecast to arrive on Tuesday (Aug 25) 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 1.4m 6s period and expected on Wednesday (Aug 26) at 8AM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Thu 27th Aug)5ft (1.5m) 12s
Best Surf 8AM (Thu 27th Aug)5ft (1.5m) 12s
Most Powerful 2PM (Tue 25th Aug)8ft (2.4m) 14s

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 table for Onrus.

Right off the bat, the first few days are a write-off. Tuesday the 25th and Wednesday the 26th have some solid swell, but with a cross-onshore breeze messing things up, it’s all chop and no good. The water is sitting at 59°, which is pretty much normal for this time of year, so no surprises there.

Thursday the 27th is where it starts to get interesting. We’ve got clean conditions with a light cross-offshore breeze. The swell is around 5 ft from the S with a 12-second period. The combined energy is moderate (821), and the report says expect very good surf. It’s an inconsistent reef break, so be patient, and crowds are possible. This is your best bet for the first week.

Friday the 28th morning is a bit marginal, but the afternoon turns glassy with a 3 ft WSW swell at 14 seconds. The energy is low (511), so it’ll be small but clean. Saturday the 29th and Sunday the 30th stay clean but marginal, with a moderate breeze keeping things a bit bumpy.

Now, looking ahead to Monday the 1st of September – hold onto your board. Tuesday afternoon the 1st of September is a standout. We’ve got a 10 ft SW swell with a 14-second period and clean offshore winds. The combined energy is massive (3508). This is expert-only territory, as it’s way too big for beginners. The wave quality is expected to be excellent, but the sheer size means only the most experienced crew should be out there. The next few days (2nd to 4th of September) are all similar – huge swell, over 8 ft, and clean winds, but the same caveat applies: this is big wave stuff.

After that, from the 5th of September onward, the wind turns bad again and the swell drops, so the window of opportunity is pretty narrow. The 6th of September has some light onshore winds, but it’s a marginal call.

So, to wrap it up: the clear winner is Thursday the 27th of August for a clean, solid session, but the real thrill-seekers should eye up Tuesday the 1st of September for a proper barrel.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 22°C on Thu morning, min 11°C on Tue morning). Winds decreasing (fresh winds from the E on Tue night, calm by Thu night).

Days 4-6 Weather Summary

Light rain (total 8mm), mostly falling on Sat night. Very mild (max 19°C on Fri afternoon, min 10°C on Sun night). Wind will be generally light.

Tuesday
25
Wednesday
26
Thursday
27
Friday
28
Saturday
29
Sunday
30
Monday
31
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
2
3
3
3
1
3
3
2
2
2
1
2
2
1
1
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2.4
SW
14
2.1
SW
14
1.8
SW
13
1.3
WSW
13
0.9
SSW
16
1.5
S
11
1.5
S
12
1.4
SSW
11
1.3
S
11
1.1
S
11
0.8
WSW
14
1.1
WSW
13
1.1
WSW
13
1.5
WSW
14
1.3
WSW
13
1.3
WSW
13
2.3
SW
12
2.1
SW
11
1.8
SW
11
1.8
SW
11
1.3
WSW
11
Wave Graph
Metric surfscale
Energy kJ
2358
1637
1144
512
392
596
628
513
410
279
239
402
421
826
545
512
1472
1047
780
716
352
Wind (km/h)
20
E
30
ESE
30
E
35
E
20
E
10
NE
10
W
5
WSW
5
ESE
5
S
5
S
5
NE
20
W
20
W
15
S
15
SSE
15
SE
10
E
10
E
15
S
10
WSW
Wind State
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross-off
cross-off
glassy
cross-on
glassy
glassy
cross-off
cross-off
cross-on
cross-on
on
cross-on
cross-on
cross-on
cross-off
High Tide
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
4:32PM1.68m
4:48AM1.52m
5:04PM1.65m
Low Tide
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
10:19AM0.07m
10:46PM0.09m
10:49AM0.11m
11:19PM0.13m
clear
clear
clear
part cloud
clear
clear
clear
part cloud
part cloud
part cloud
clear
cloud
cloud
cloud
rain showers
rain showers
part cloud
part cloud
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:11
7:09
7:09
7:07
7:05
7:05
7:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:19
6:20
6:21
6:21
6:22
6:22
6:22
 mm
6
2
Temp °C
14
18
14
15
21
19
22
21
16
18
19
16
17
18
16
14
14
13
13
15
11
Feels °C
9
13
9
9
18
17
20
18
16
17
18
15
13
13
13
11
10
9
11
11
9
  • 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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