Onrus Surf Break

Lat Long: 34.41° S 19.17° E

Onrus Surf Forecast and Surf Report

Issued: 7 pm 30 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 30 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: Tuesday 1 Sep, 8PM (local time) - 10ft (3.0m), 13s period, SW swell with 3,415 kJ wave energy.
  • Next surfable swell (1★+): Monday 31 Aug, 11AM (local time) - 6ft (1.8m), 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 11AM. The primary swell is predicted to be 1.8m and 11s 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 3.0m 13s and forecast to arrive on Tuesday (Sep 01) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 8s period and expected on Sunday (Sep 06) at 5PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+)11AM (Mon 31st Aug)6ft (1.8m) 11s
Best Surf 2PM (Tue 1st Sep)10ft (3.0m) 13s
Most Powerful 8PM (Tue 1st Sep)10ft (3.0m) 13s

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


The Lowdown

Alright, Rusty here. Let’s talk about what’s cooking at Onrus.

Right now, the water’s sitting at about 59°, which is a touch colder than what we’re used to for this time of year – about 2° off, so you’ll want a decent spring suit.

The next 16 days start with a bit of a slow burner. We’ve got some swell showing up from Sunday the 30th, but the conditions are messy with a southerly breeze, so it’s not really game on yet. The waiting pays off though. Monday the 31st morning is where it starts to get interesting. The wind goes glassy, dead calm, and we’ve got a 6ft SW swell rolling in with an 11-second period. The energy is moderate at 828, but that clean, glassy surface is what we live for. That’s a proper session right there, with light winds and clean lines. The afternoon holds up too with a cross-offshore breeze and similar 6ft SW swell.

Now, the standout – and I mean the real standout – is Tuesday the 1st of September. We’re looking at 8ft of SW groundswell, a solid 13-second period, and light cross-offshore winds in the morning. The combined energy jumps to 2340 (moderate to strong). This is excellent, powerful surf for experienced crew. It’s gonna be a ripper. The afternoon sees it bump up to 10ft, but that might be pushing the limits of what this reef can handle cleanly without getting a bit too heavy.

Wednesday the 2nd morning is also big at 10ft with a 14-second period and strong energy (2887), but the wind is onshore, making it a messy affair. After that, from Wednesday afternoon right through until the 9th of September, it’s a write-off. Strong winds, lumpy seas, and conditions that are more suited to kites than paddles. We’re looking at a solid 6-day gap of no surf worthwhile.

The next sniff of something good comes on Thursday the 10th of September. The morning is tiny and glassy, but the afternoon brings a sudden change: 4ft of WSW swell with a very long 16-second period, glassy conditions, and energy of 852. That is a sneaky good, clean afternoon session on a long-period groundswell. It’ll be walled up and perfect for the reef.

Following that, Friday the 11th of September morning fires up with 10ft SW swell and a 12-second period. Energy is massive at 4448. But that’s serious size – expert only, and the wind is light onshore so it’ll be a bit lumpy on the face. Saturday the 12th onward drops back to poor conditions with onshore winds and chop. Sunday the 13th is tiny and messy, and Monday the 14th brings more strong winds and lumpy 8ft swell.

So, to wrap it up: Tuesday the 1st morning is your absolute best bet – clean, powerful, and pumping. Monday the 31st morning is a close second for a glassy, fun ride. The long-range Thursday the 10th afternoon is a promising wildcard if you can get there.

Rusty.

Short Range Forecast

Mostly dry. Very mild (max 17°C on Wed afternoon, min 9°C on Sun night). Wind will be generally light.

Days 5-7 Weather Summary

Heavy rain (total 20mm), heaviest during Thu morning. Very mild (max 19°C on Sat afternoon, min 12°C on Thu morning). Winds increasing (light winds from the E on Wed night, near gales from the SSE by Thu morning).

Monday
31
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
3
3
2
4
4
!
!
!
2
4
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)
2.1
SW
12
1.8
SW
11
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
2.3
SW
13
3.5
S
9
3
S
9
2.5
S
9
1.7
S
9
1.4
S
8
1.1
S
8
1.1
S
10
0.9
SW
21
2.3
SW
17
Wave Graph
Metric surfscale
Energy kJ
1162
828
821
1259
2340
3112
3305
2802
2381
1697
1879
1436
977
429
258
144
226
634
3074
Wind (km/h)
10
NE
5
SSE
10
SW
5
N
5
WSW
10
WSW
10
NNE
5
ESE
10
S
10
N
60
SSE
40
SSE
40
SE
40
ESE
35
ESE
30
E
35
E
35
ESE
35
E
Wind State
cross
glassy
cross
cross-off
glassy
cross-off
cross-off
glassy
cross-on
cross-off
cross-on
on
on
cross-on
on
cross-on
cross-on
cross-on
cross-on
High Tide
4:48AM1.52m
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
Low Tide
10:46PM0.09m
10:49AM0.11m
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
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
heavy rain
mod rain
rain showers
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:03
7:01
7:01
7:00
6:58
6:56
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:22
6:22
6:23
6:24
6:24
6:25
6:27
 mm
11
6
3
Temp °C
12
12
14
12
14
15
13
16
17
14
12
13
14
16
17
13
16
19
14
Feels °C
8
10
12
11
13
13
11
15
15
13
6
5
6
8
9
7
10
12
8
  • 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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