Onrus Surf Break

Lat Long: 34.41° S 19.17° E

Onrus Surf Forecast and Surf Report

Issued: 1 am 28 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 28 Aug 2026:

  • Best quality surf: Wednesday 2 Sep, 2AM (local time) - 10ft (3.0m), 13s period, SW swell with cross-onshore winds.
  • Most powerful swell: Wednesday 2 Sep, 5AM (local time) - 13ft (4.0m), 19s period, SW swell with 12,093 kJ wave energy.
  • Next surfable swell (1★+): Friday 28 Aug, 11AM (local time) - 3.5ft (1.1m), 11s 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 Friday (Aug 28) at 11AM. The primary swell is predicted to be 1.1m and 11s period with a secondary swell of 0.6m 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 4.0m 19s and forecast to arrive on Wednesday (Sep 02) at 5AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 4s period and expected on Saturday (Aug 29) at 11AM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+)11AM (Fri 28th Aug)3.5ft (1.1m) 11s
Best Surf 2AM (Wed 2nd Sep)10ft (3.0m) 13s
Most Powerful 5AM (Wed 2nd Sep)13ft (4.0m) 19s

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


The Lowdown

Right, let’s talk about what’s shaping up for Onrus. This is a reef setup, exposed to the SW, and when it lines up, it can give you some proper wedges. It’s a spot that’s inconsistent, so you gotta be picky.

Right now, there’s nothing happening for the first few days. We’re looking at a bit of a wait. The first real chance to get wet is this Friday morning, the 28th of August. The water’s sitting at a cool 59°F, which is pretty much bang on average for this time of year, so nothing wild there. Friday morning, we’ve got a clean 4ft swell pushing in from the south, with a period of 11 seconds. The wind is glassy, off the WSW at just 3 mph. It’s going to be clean, and the wave energy is moderate, sitting at (493). It’s not huge, but for an inconsistent reef, this is a solid start.

Then Friday afternoon, the swell drops a little to 3ft, but the period stretches right out to 14 seconds from the WSW, still glassy. That long period will make for some proper lines, just a bit slower and more powerful for its size. The energy stays moderate (476). This is more of a patient surfer’s wave.

Saturday morning, the 29th, is the standout of this whole run. We’ve got 4ft of swell from the WSW, but the period is still a meaty 13 seconds, and the combined energy jumps into the strong bracket (702). The wind is glassy from the NE. That’s a recipe for clean, fat lines over the reef. Expect good quality, but remember, this is an inconsistent spot, so you might have to sit and wait for the set. Crowds can show up here sometimes, so keep an eye out.

Be aware that Saturday afternoon the wind swings to a cross-onshore, and the swell gets a bit lumpy. That’s a write-off.

Sunday the 30th, the swell bumps up to 8ft from the SW with a period of 12 seconds. That’s a lot of water, and the energy is very strong (1690). But the wind is onshore and strong, so it’s going to be messy. This is more of a kite-surfing setup than a clean paddle session. Not the best.

Monday the 31st, the swell settles to a clean 6ft from the SW. The magic happens in the morning with a light offshore Westerly wind at 3 mph. That is a massive positive – offshore and clean on a rising tide. The energy is still strong (832). This is your second-best window.

Then we get into a big, angry patch. From Tuesday the 1st of September, the swell gets bigger and bigger, hitting 15ft on Wednesday with a period of 16 seconds (energy of 9408 – that’s extreme power), but it’s accompanied by brutal onshore winds – 22 to 28 mph. Forget about it. That’s only for the absolute experts, and even then, it’s going to be a washing machine. This phase continues through to Friday the 4th of September with 37 mph winds. Not a paddle in sight.

The second week settles down. By Saturday the 5th of September, the swell drops back to 7ft from the SE, but the wind is light cross-onshore. It’s a marginal call, and only for the keen.

The following Monday the 7th sees tiny, clean 2ft groundswell, but it’s glassy. Not worth a trip.

The last real sniff is on Thursday the 10th of September: a moderate 5ft from the SW, but we get a solid NW offshore wind at 16 mph. That will groom the reef nicely, and the energy is moderate (384). That’s a promising but less certain call that far out.

Overall, the window is narrow. Friday the 28th and Saturday the 29th of August, plus Monday the 31st, are your best bets. After that, it’s either blown out or too small.

Rusty.

Short Range Forecast

Light rain (total 2mm), mostly falling on Sat afternoon. Very mild (max 19°C on Sat afternoon, min 11°C on Sun night). Wind will be generally light.

Days 4-6 Weather Summary

Some drizzle, heaviest during Tue night. Very mild (max 16°C on Tue afternoon, min 11°C on Mon night). Winds increasing (calm on Mon morning, fresh winds from the SE by Wed afternoon).

Friday
28
Saturday
29
Sunday
30
Monday
31
Tuesday
1
Wednesday
2
Thursday
3
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
2
2
3
0
2
1
0
3
3
2
3
3
3
!
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)
1.1
S
11
0.8
WSW
14
1
WSW
13
1.1
WSW
13
1.3
WSW
14
1.9
SW
9
2.4
SW
12
2.3
SW
12
2
SW
12
1.8
SW
11
1.8
SW
11
1.8
SW
11
2.3
SW
13
2.3
SW
13
3
SW
13
4.5
SW
16
3.5
SW
15
3
SW
14
2.5
SW
13
1.8
WSW
12
1.8
SW
12
Wave Graph
Metric surfscale
Energy kJ
279
239
302
408
682
624
1679
1444
1092
828
752
716
1919
1834
2917
9408
6116
3728
2201
1032
933
Wind (km/h)
5
WSW
5
S
5
SW
5
NNE
15
SSW
10
SSE
15
SE
25
SSE
5
ESE
5
WNW
5
SSW
10
NNE
20
W
25
WNW
15
SSE
20
ESE
30
SE
25
E
40
SE
45
SE
45
ESE
Wind State
glassy
glassy
glassy
glassy
cross-on
cross-on
on
on
cross-on
off
cross
cross-off
cross-off
cross-off
cross-on
on
on
cross-on
on
on
cross-on
High Tide
3:34PM1.64m
3:45AM1.55m
4:02PM1.68m
4:16AM1.55m
4:32PM1.68m
4:48AM1.52m
5:04PM1.65m
5:22AM1.46m
5:38PM1.57m
6:00AM1.36m
6:18PM1.46m
6:47AM1.24m
7:09PM1.32m
Low Tide
9:23AM0.10m
9:46PM0.12m
9:50AM0.07m
10:15PM0.09m
10:19AM0.07m
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
clear
part cloud
cloud
cloud
light rain
light rain
part cloud
clear
part cloud
clear
clear
clear
clear
part cloud
rain showers
part cloud
cloud
cloud
light rain
rain showers
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:07
7:05
7:05
7:03
7:01
7:01
7:00
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:21
6:22
6:22
6:22
6:23
6:24
6:24
 mm
1
1
1
5
1
Temp °C
17
18
17
16
19
13
14
15
12
14
15
12
14
16
15
14
15
13
13
15
14
Feels °C
16
18
16
16
16
9
9
9
7
12
12
11
10
11
12
9
8
6
5
5
5
  • 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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