Onrus Surf Break

Lat Long: 34.41° S 19.17° E

Onrus Surf Forecast and Surf Report

Issued: 7 pm 08 Sep 2026 (local time)

Forecast update in  hr  min

Today's Onrus sea temperature is
13.3°C
2.4° 

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


Onrus surf forecast from 8 Sep 2026:

  • Best quality surf: Tuesday 15 Sep, 8PM (local time) - 11ft (3.5m), 18s period, WSW swell with offshore winds.
  • Most powerful swell: Wednesday 16 Sep, 2AM (local time) - 13ft (4.0m), 16s period, SW swell with 8,290 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 9 Sep, 8AM (local time) - 3ft (0.9m), 14s 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 Wednesday (Sep 09) at 8AM. The primary swell is predicted to be 0.9m and 14s period with a secondary swell of 0.4m and 9s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Onrus in the next 16 days are 4.0m 16s and forecast to arrive on Wednesday (Sep 16) at 2AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Tuesday (Sep 15) at 5AM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Wed 9th Sep)3ft (0.9m) 14s
Best Surf 8PM (Tue 15th Sep)11ft (3.5m) 18s
Most Powerful 2AM (Wed 16th Sep)13ft (4.0m) 16s

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


The Lowdown

Alright, let’s get into it. The next couple of weeks are a bit of a mixed bag around here, with a few windows of clean surf but plenty of junky, wind-blown stuff to sort through as well. The first real opportunity we’ve got is shaping up for Thursday, the 10th. There’s some solid new energy coming in, about 7ft of SW swell with a decent 15-second period. The wind is light, but it’s cross-onshore, which will put a little texture on the face. It’s not perfect, but there’s enough push in the water to make it worth a look. The wave energy is definitely up there, with a reading of 2061, so there’s some proper weight behind it.

That’s about as good as it gets for a few days, though. Friday and Saturday see the wind swing onshore and strengthen, making a mess of things. The swell holds, but it’s not going to be a pleasant paddle. We’ve got moderate to fresh breezes and choppy, lumpy conditions. It’s a good time to get other things sorted.

Sunday is still pretty average, with more cross-onshore wind and lumpy waves. But then things start to change. Monday, the 14th, sees the wind shift to a cross-offshore direction, which is a big plus. The swell drops a bit to around 3ft, but it’s clean. It’s on the smaller side, but a longboard or a funboard would be your friend. Then things get really interesting.

Tuesday the 15th is where it starts to fire. The swell is about 4ft, but hold on to your hat – that period is a mammoth 22 seconds. This is proper groundswell, with a ton of energy (1830) and real push. The wind will be offshore and fresh, making for some clean, hollow walls. This is a standout window at Onrus. The long period can make beach breaks a bit straight, but this spot, being a reef, should handle it beautifully.

Wednesday the 16th is a washout for most of us, though. The swell jumps to a solid 12ft, which is far too big for this place. It’s just going to be a close-out, with cross-onshore winds and way too much water moving around. Unless you’re an absolute gun looking for a beating, give it a miss. Thursday the 17th is also pretty ordinary – the wind is on it and the swell is messy.

Now, for the real highlight of the whole run. Friday the 18th. The wind goes glassy. Absolutely calm. And there’s a solid 8ft of SW swell rolling in with a period around 18 seconds. This is what we wait for. The conditions will be near-perfect, clean, and powerful. It’ll be a proper session for experienced surfers. The energy reading is strong at 3530, so there’s no shortage of grunt. This is the day to clear your schedule.

The weekend after that, the 19th, looks like it’s going to hold some fun waves too. We’ve got 8ft to 8ft of SW swell with a 14-second period and a cross-offshore breeze. It won't be as flawless as Friday, but it’ll still be clean and a lot of fun. Then things start to get big and wild again.

Sunday the 20th, the swell is up to 10ft, and it’s too big for the break. After that, it gets properly out of control with a 16ft swell showing up on Sunday afternoon. That’s just dangerous, with strong winds and a massive, messy ocean. Monday the 21st and Tuesday the 22nd are similar – huge, lumpy, and blown out. Not surfable in the conventional sense. The setup is more interesting for the kite crew than for paddlers. It stays oversized for a few days.

By the time we get to the end of the week, it starts to back off. Wednesday the 23rd drops to around 4ft, with light cross-onshore winds. It's small and a little bumpy, but it’s rideable. The water temp is about average for this time of year, so a decent full suit is still the go.

And then, to wrap things up, Thursday the 24th looks like a little bonus. The swell settles to about 4ft, but the wind goes cross-offshore and it’s clean. Combined with the moderate energy (418), it could be a fun, easygoing session to close out the weekend.

So, look, the standout is pretty clear in my mind. That Friday the 18th is the one. Glassy, solid, and powerful. The Tuesday the 15th is also a great shout with that crazy long-period swell. The rest is a case of picking your moments and being patient.

Rusty out.

Short Range Forecast

Mostly dry. Warm (max 21°C on Tue night, min 14°C on Wed night). Winds increasing (calm on Wed morning, fresh winds from the ESE by Fri afternoon).

Days 5-7 Weather Summary

Light rain (total 8mm), mostly falling on Sun night. Very mild (max 18°C on Sun night, min 14°C on Fri night). Mainly fresh winds.

Wednesday
9
Thursday
10
Friday
11
Saturday
12
Sunday
13
Monday
14
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
1
0
2
3
2
2
0
0
0
0
0
1
1
1
2
2
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)
0.8
SW
11
0.9
WSW
13
0.9
WSW
13
1.5
SW
12
2.2
SW
15
2.2
SW
14
1.9
SW
13
1.7
WSW
12
1.4
SW
12
1.1
WSW
12
1.6
SW
14
2.3
SW
17
2.2
SW
15
1.8
SW
14
2
SSW
13
1.3
SW
13
1
SW
12
0.8
SW
12
0.8
SW
12
Wave Graph
Metric surfscale
Energy kJ
142
304
295
667
2061
1672
1230
795
568
330
1048
3016
2010
1244
1426
537
291
197
197
Wind (km/h)
10
E
10
SSW
10
S
10
E
10
S
10
S
15
ESE
25
ESE
30
ESE
25
ESE
25
ESE
30
SE
20
ESE
20
E
20
E
15
NE
10
W
35
NW
25
NNW
Wind State
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
on
cross-on
on
on
cross-on
cross-on
cross-on
cross
cross-off
off
off
High Tide
1:55AM1.47m
2:17PM1.61m
2:35AM1.55m
2:53PM1.70m
3:11AM1.59m
3:27PM1.75m
3:45AM1.60m
3:59PM1.73m
4:17AM1.56m
4:30PM1.67m
4:48AM1.49m
4:59PM1.58m
Low Tide
8:07AM0.13m
8:34PM0.10m
8:44AM0.06m
9:11PM0.03m
9:17AM0.03m
9:45PM0.00m
9:49AM0.04m
10:16PM0.03m
10:20AM0.09m
10:46PM0.09m
10:49AM0.17m
11:15PM0.19m
clear
clear
clear
clear
part cloud
cloud
cloud
cloud
cloud
cloud
cloud
light rain
cloud
cloud
cloud
light rain
cloud
rain showers
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:52
6:50
6:48
6:47
6:46
6:45
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:29
6:30
6:30
6:30
6:31
6:31
6:32
 mm
2
5
1
Temp °C
21
19
19
15
17
18
15
17
17
15
15
16
16
17
17
18
17
17
16
Feels °C
20
19
18
14
17
17
14
13
12
11
12
12
13
15
15
18
17
14
12
  • 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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