Onrus Surf Break

Lat Long: 34.41° S 19.17° E

Onrus Surf Forecast and Surf Report

Issued: 1 am 04 Sep 2026 (local time)

Forecast update in  hr  min

Today's Onrus sea temperature is
14.8°C
0.8° 

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


Onrus surf forecast from 4 Sep 2026:

  • Best quality surf: Monday 7 Sep, 8AM (local time) - 6ft (1.8m), 14s period, SW swell with cross-offshore winds.
  • Most powerful swell: Sunday 6 Sep, 11AM (local time) - 8ft (2.5m), 18s period, SSW swell with 4,423 kJ wave energy.
  • Next surfable swell (1★+): Monday 7 Sep, 8AM (local time) - 6ft (1.8m), 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 Monday (Sep 07) at 8AM. The primary swell is predicted to be 1.8m and 14s period with a secondary swell of 0.6m and 6s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Onrus in the next 16 days are 2.5m 18s and forecast to arrive on Sunday (Sep 06) at 11AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.3m 7s period and expected on Sunday (Sep 06) at 11AM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Mon 7th Sep)6ft (1.8m) 14s
Best Surf 8AM (Mon 7th Sep)6ft (1.8m) 14s
Most Powerful11AM (Sun 6th Sep)8ft (2.5m) 18s

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


The Lowdown

Alright folks, Rusty here. Let’s have a look at what’s on the cards for Onrus.

The next week and a half is a real mixed bag, with a lot of wind-ruined sessions and a few windows that’ll be worth the wait. The first few days are a write-off; strong cross-onshore winds and messy conditions mean you’re better off staying on the beach. But hang in there, because there’s a couple of proper standouts coming.

The first real light at the end of the tunnel is Monday, 7th September. The morning kicks off with a clean 6ft SW groundswell (period 14 seconds) and light cross-offshore winds – that’s a solid combo for a reef setup. The combined energy is moderate to strong (1356). Then Monday afternoon turns absolutely glassy, with the same 6ft SW swell and no wind. That’s the pick of the first week, no question. It’s a bit punchy for beginners, but for an intermediate surfer, that’s a dream session.

After that, Tuesday and Wednesday drop off in size and quality, so don’t expect much.

Now, looking further ahead, the real standout pops up on Wednesday morning, 16th September. We’ve got a 5ft SW groundswell with a very long period of 17 seconds, and the wind is offshore and clean. The combined energy is strong (2539). That long period means the waves will have heaps of energy and shape, but at a reef break like Onrus, it should line up beautifully. This is the one to circle on the calendar – excellent conditions for experienced surfers.

The following Friday morning, 18th September, is another head-turner, but for a different reason. The swell jumps to 13ft from the SW (period 14 seconds) with glassy conditions. Combined energy is massive (5930). That’s a serious, heavy swell. This is expert territory only – way too big for most. If you’re not a seasoned charger, give it a miss. The afternoon stays big at 12ft but picks up a light cross-onshore breeze, still a beast.

Water temp at Onrus is sitting around 59°F, which is about 1°F cooler than normal for this time of year – not a huge anomaly, just a bit fresh.

The first few days have no surf worth mentioning, and the final days of the outlook taper off into marginal conditions. The two clear standouts are Monday 7th September afternoon (glassy, solid 6ft) and Wednesday 16th September morning (offshore, long-period 5ft).

Rusty

Short Range Forecast

Mostly dry. Warm (max 24°C on Sun afternoon, min 12°C on Fri night). Winds decreasing (strong winds from the ESE on Fri afternoon, light winds from the NE by Sun night).

Days 4-6 Weather Summary

Mostly dry. Warm (max 24°C on Mon morning, min 15°C on Wed night). Wind will be generally light.

Friday
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
Wednesday
9
Thursday
10
AM
PM
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
0
0
1
4
4
3
2
1
2
1
1
0
2
2
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
S
9
2.1
SSE
8
1.4
SE
7
1.3
S
10
1.1
SSW
10
1.6
SW
21
2.5
SSW
18
2.1
SW
16
1.8
SW
15
1.8
SW
14
1.8
SW
13
1.2
SSW
12
1.3
SW
12
0.6
WSW
12
0.8
SW
11
1.1
SW
13
0.9
WSW
13
1.1
SW
12
2.2
SW
14
2.4
WSW
14
2.5
SW
14
Wave Graph
Metric surfscale
Energy kJ
573
597
217
307
218
2113
4423
2113
1413
1299
1069
387
448
106
164
380
286
325
1814
2313
2483
Wind (km/h)
40
ESE
45
ESE
35
E
40
E
45
ESE
35
E
30
E
25
E
20
ENE
10
WSW
5
SSE
0
NNE
5
S
5
S
5
SW
10
SW
5
S
10
E
10
S
15
S
20
SE
Wind State
cross-on
on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-off
glassy
glassy
glassy
cross-on
glassy
cross
cross-on
cross-on
cross-on
cross-on
on
High Tide
8:28PM1.19m
9:44AM1.06m
10:28PM1.15m
11:40AM1.14m
00:06AM1.23m
12:49PM1.30m
1:08AM1.36m
1:37PM1.47m
1:55AM1.47m
2:17PM1.61m
2:35AM1.55m
2:53PM1.70m
3:11AM1.59m
Low Tide
1:53PM0.55m
3:13AM0.54m
3:56PM0.62m
5:16AM0.51m
5:56PM0.53m
6:34AM0.38m
7:05PM0.37m
7:26AM0.25m
7:53PM0.22m
8:07AM0.13m
8:34PM0.10m
8:44AM0.06m
9:11PM0.03m
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
part cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:58
6:56
6:56
6:54
6:52
6:52
6:50
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:25
6:27
6:28
6:28
6:29
6:30
6:30
 mm
Temp °C
16
17
13
16
19
14
18
24
19
24
24
21
21
23
22
19
19
15
18
17
15
Feels °C
7
8
4
8
11
7
12
20
17
23
24
21
21
23
23
19
18
14
17
15
14
  • 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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