Onrus Surf Break

Lat Long: 34.41° S 19.17° E

Onrus Surf Forecast and Surf Report

Issued: 1 pm 31 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 31 Aug 2026:

  • Best quality surf: Tuesday 1 Sep, 2PM (local time) - 10ft (3.0m), 13s period, SW swell with cross-offshore winds.
  • Most powerful swell: Wednesday 2 Sep, 2AM (local time) - 10ft (3.0m), 14s period, SW swell with 3,518 kJ wave energy.
  • Next surfable swell (1★+): Monday 31 Aug, 8PM (local time) - 5ft (1.5m), 11s 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 Monday (Aug 31) at 8PM. The primary swell is predicted to be 1.5m and 11s period with a secondary swell of 1.3m and 11s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Onrus in the next 16 days are 3.0m 14s and forecast to arrive on Wednesday (Sep 02) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 8PM (Mon 31st Aug)5ft (1.5m) 11s
Best Surf 2PM (Tue 1st Sep)10ft (3.0m) 13s
Most Powerful 2AM (Wed 2nd Sep)10ft (3.0m) 14s

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


The Lowdown

Alright, Rusty here, let’s break down what’s on offer for Onrus.

Right off the bat, the start of this 16-day window looks very clean, with solid power, but it's built for experienced surfers only. We kick off on the afternoon of Monday the 31st, with a 6ft SW swell and a light cross-shore breeze. It’s not perfect, and the water is sitting at 59°, a bit colder than usual for the time of year.

The real standout window hits Tuesday the 1st of September. That morning, you’ve got an 8ft SW groundswell, with a long period of 13 seconds, and it’s glassy as glass with a light offshore wind from the NW. This is the pick of the forecast – clean, powerful, and well-shaped for the reef. The combined swell energy is massive (2340), so it's a proper swell. Later that afternoon, it jumps to a 10ft SW swell with a cross-offshore breeze, which is still beautiful, but only for the experienced crew.

Wednesday the 2nd holds size at 10ft again in the morning, but with a cross-onshore wind, so it loses a lot of its appeal. The energy is still huge (2802), but it’s not clean.

After that, the wheels fall off. From Thursday the 3rd right through to around the middle of the month, it’s all poor conditions – strong winds, onshore slop, and messy surf. You get a brief break in the ordinary conditions on the 8th and 9th of September, with small, clean, glassy mornings, but the swell is tiny at 2ft – barely worth getting wet for.

There’s another flicker of hope on Monday the 14th of September, with a small 3ft SW swell and a clean cross-off breeze in the afternoon, but it’s not going to get the heart racing.

Best on offer: Hands down, Tuesday morning the 1st of September. Clean, powerful, and that NW offshore is pure magic for the reef.

Now, because Onrus is a reef break and inconsistent, this isn’t a spot that fires all the time. The blank run after that first week is real, but that one morning makes it worth keeping an eye on the charts.

Rusty.

Short Range Forecast

Light rain (total 5mm), mostly falling on Thu morning. Very mild (max 17°C on Wed afternoon, min 11°C on Mon night). Winds increasing (calm on Mon night, fresh winds from the SSE by Thu morning).

Days 5-7 Weather Summary

Moderate rain (total 12mm), heaviest on Thu afternoon. Very mild (max 19°C on Sat afternoon, min 13°C on Thu afternoon). Mainly strong winds.

Mon
31
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
Sunday
6
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
4
4
!
!
!
2
4
0
0
0
0
0
0
0
0
0
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)
1.9
SW
11
2.3
SW
11
2.5
SW
13
3
SW
13
3
SW
14
3
SW
13
2.5
SW
13
2
WSW
13
3.5
SSE
9
2.5
S
9
2.4
S
9
1.9
S
9
1.4
S
8
0.7
WSW
11
0.9
SSW
10
0.9
SSW
10
1.4
SW
17
1.3
SW
14
1.3
SW
15
0.8
SSW
13
Wave Graph
Metric surfscale
Energy kJ
821
1259
2340
3257
3518
2802
2354
1338
1751
1075
919
561
266
99
137
135
1036
726
677
206
Wind (km/h)
10
SSW
5
N
5
NW
15
W
10
NNE
5
E
10
SSE
15
NNE
30
SSE
40
SE
35
ESE
40
ESE
45
ESE
40
E
35
E
40
ESE
30
E
35
E
35
E
35
ENE
Wind State
cross
cross-off
off
cross-off
cross-off
cross-on
cross-on
cross-off
cross-on
on
on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
High Tide
5:04PM1.65m
5:22AM1.46m
5:38PM1.57m
6:00AM1.36m
6:18PM1.46m
6:47AM1.24m
7:09PM1.32m
7:53AM1.12m
8:28PM1.19m
9:44AM1.06m
10:28PM1.15m
11:40AM1.14m
00:06AM1.23m
Low Tide
11:19PM0.13m
11:22AM0.18m
11:55PM0.20m
11:59AM0.29m
00:39AM0.31m
12:45PM0.42m
1:37AM0.44m
1:53PM0.55m
3:13AM0.54m
3:56PM0.62m
5:16AM0.51m
5:56PM0.53m
clear
clear
clear
clear
part cloud
clear
clear
part cloud
light rain
rain showers
rain showers
part cloud
clear
clear
clear
clear
part cloud
part cloud
part cloud
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:01
7:01
7:00
6:58
6:56
6:56
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:22
6:23
6:24
6:24
6:25
6:27
6:28
 mm
5
11
1
Temp °C
14
11
14
15
13
16
17
14
14
15
14
16
18
14
17
19
16
17
17
16
Feels °C
12
10
13
12
10
14
14
12
8
8
6
7
9
6
10
12
10
12
11
10
  • 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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