Onrus Surf Break

Lat Long: 34.41° S 19.17° E

Onrus Surf Forecast and Surf Report

Issued: 7 pm 11 Sep 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 11 Sep 2026:

  • Best quality surf: Tuesday 15 Sep, 11PM (local time) - 10ft (3.0m), 15s period, WSW swell with cross-shore winds.
  • Most powerful swell: Tuesday 15 Sep, 11PM (local time) - 10ft (3.0m), 15s period, WSW swell with 4,279 kJ wave energy.
  • Next surfable swell (1★+): Monday 14 Sep, 2AM (local time) - 4.5ft (1.3m), 13s 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 (Sep 14) at 2AM. The primary swell is predicted to be 1.3m and 13s period with a secondary swell of 1.0m and 9s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Onrus in the next 16 days are 3.0m 15s and forecast to arrive on Tuesday (Sep 15) at 11PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 9s period and expected on Sunday (Sep 13) at 11AM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 2AM (Mon 14th Sep)4.5ft (1.3m) 13s
Best Surf11PM (Tue 15th Sep)10ft (3.0m) 15s
Most Powerful11PM (Tue 15th Sep)10ft (3.0m) 15s

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


The Lowdown

Alright, grab a coffee. Let's talk about Onrus. This forecast has a slow start, but then it gets interesting in a big way.

The pattern is a long wait for a window of decent conditions, followed by a period that could be a bit of a riot. The first week is pretty much a write-off for most of us. There's swell, but the wind's just not playing ball. It’s not until Monday the 14th that we see a glimmer of hope, but it's fleeting.

Overall Pattern & The Gap: The whole first week is tough. From Saturday, September 12 right through to Sunday, September 20, the surf at Onrus is either poor or marginal. That's a solid nine days of cleaning your board and sitting on the cliff. The real story here is the wind. We've got a consistent easterly flow pumping in, meaning cross-on or onshore winds just about every day, making the ocean lumpy, choppy, and messy.

The Standout – Window of Opportunity: The one and only true standout is Monday, September 14. It's a classic "sneak in a session" call. The morning sees a 4ft groundswell from the SW with a period of 12 seconds, dropping to 3ft by the afternoon. The kicker? The wind goes offshore from the NW, blowing a fresh 19 mph. That'll clean it right up. The combined energy is moderate (430-502), so it's not a monster, but it will be clean and rideable. The water temp is about average for this time of year.

The Late Week Surprise (But Not for Us): This is where it gets a bit painful. Wednesday, September 23, the swell pumps up. We're looking at a solid 10ft SW groundswell (11s period) by morning, jumping to 12ft with a longer 14-second period by the afternoon, with a massive combined energy of 5021. That's powerful, clean wave energy. The wind is offshore or cross-off from the WNW. Sounds perfect, right? Problem is, the models are saying this is *too big* for Onrus. At over 8ft, it's strictly for experts at this reef, and even then, it might just close out. It's a frustrating "what if" for the rest of us.

Summary:
- Best Bet: Monday, September 14. 3ft - 4ft SW groundswell. Clean, offshore NW wind. Small but fun. Expect crowds sometimes at this spot.
- Rest of the week: Forget it. The easterly wind just won't let up.
- Next Week (Sept 23+): Big, powerful swell but likely too big and dangerous for a standard session at Onrus. This is one for the big wave chargers only, and even then, be careful.

Remember, the first week is the real test of patience. The conditions will turn, but it takes time.

Rusty

Short Range Forecast

Moderate rain (total 13mm), heaviest on Sat morning. Warm (max 20°C on Mon afternoon, min 14°C on Sat afternoon). Winds decreasing (fresh winds from the E on Sat night, light winds from the NW by Sun night).

Days 5-7 Weather Summary

Heavy rain (total 22mm), heaviest during Tue night. Very mild (max 17°C on Mon night, min 11°C on Wed morning). Mainly strong winds.

Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
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
0
3
1
2
2
2
2
!
2
1
2
1
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)
1.3
WSW
12
2
SW
15
2.4
SW
16
2.3
SW
15
1.8
SW
14
1.6
SW
14
1.3
SW
13
1.1
SW
12
1
SW
12
0.8
SW
11
0.6
SW
19
1.5
SW
16
3
WSW
14
2.2
WSW
14
2.3
SW
13
1.9
SW
12
1.8
SW
12
1.6
SW
12
2.1
SW
12
Wave Graph
Metric surfscale
Energy kJ
407
1638
3096
2229
1355
961
600
374
268
183
237
1137
3933
1997
1776
1026
895
736
1149
Wind (km/h)
30
ESE
30
E
35
E
35
E
25
E
25
E
5
NW
30
NW
30
NW
20
NNW
30
NW
45
NW
5
NNW
10
ESE
15
ESE
15
ENE
20
ESE
30
SE
25
E
Wind State
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
off
off
off
off
off
off
glassy
cross-on
cross-on
cross-on
cross-on
on
cross-on
High Tide
3:45AM1.60m
3:59PM1.73m
4:17AM1.56m
4:30PM1.67m
4:48AM1.49m
4:59PM1.58m
5:18AM1.40m
5:29PM1.45m
5:48AM1.29m
5:59PM1.31m
6:20AM1.17m
6:32PM1.17m
Low Tide
9:45PM0.00m
9:49AM0.04m
10:16PM0.03m
10:20AM0.09m
10:46PM0.09m
10:49AM0.17m
11:15PM0.19m
11:18AM0.28m
11:43PM0.30m
11:46AM0.40m
00:13AM0.43m
12:16PM0.52m
00:49AM0.55m
cloud
light rain
light rain
light rain
light rain
cloud
light rain
rain showers
clear
part cloud
part cloud
part cloud
heavy rain
mod rain
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:47
6:46
6:45
6:43
6:41
6:39
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:30
6:31
6:31
6:32
6:34
6:35
6:35
 mm
5
3
1
1
2
1
16
6
Temp °C
16
15
15
15
16
16
17
19
20
17
16
17
16
12
14
13
14
16
13
Feels °C
12
11
11
9
13
13
17
13
15
14
12
10
10
10
10
9
9
9
8
  • 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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