Onrus Surf Break

Lat Long: 34.41° S 19.17° E

Onrus Surf Forecast and Surf Report

Issued: 7 am 08 Aug 2026 (local time)

Forecast update in  hr  min

Today's Onrus sea temperature is
14.9° 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 8 Aug 2026:

  • Best quality surf: Saturday 8 Aug, 5PM (local time) - 11ft (3.5m), 14s period, SW swell with cross-shore winds.
  • Most powerful swell: Saturday 8 Aug, 5PM (local time) - 11ft (3.5m), 14s period, SW swell with 4,881 kJ wave energy.
  • Next surfable swell (1★+): Saturday 8 Aug, 5PM (local time) - 11ft (3.5m), 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 Saturday (Aug 08) at 5PM. The primary swell is predicted to be 3.5m and 14s period. The wind is predicted to be cross-shore as the swell arrives.

The most powerful waves expected at Onrus in the next 16 days are 3.5m 14s and forecast to arrive on Saturday (Aug 08) at 5PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 9s period and expected on Wednesday (Aug 12) at 5PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 5PM (Sat 8th Aug)11ft (3.5m) 14s
Best Surf 5PM (Sat 8th Aug)11ft (3.5m) 14s
Most Powerful 5PM (Sat 8th Aug)11ft (3.5m) 14s

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 menu for the next couple of weeks.

We're starting off with a bang, but not for the faint-hearted. The first decent surf comes in on Saturday, August 8th, and it's a serious one. The morning session at Onrus is showing a solid 8ft swell from the SW, with a moderate offshore breeze keeping things clean. The water is sitting at 59°F, which is pretty much normal for this time of year. The energy is pumping, with a reading of 2158, so you'll feel the power. This is excellent surf, but with that size, it's really for experienced surfers only. The wind is due to swing around in the afternoon, so get on it early.

Things get messy pretty quickly after that. Sunday the 9th through Tuesday the 12th is a write-off, with strong winds and poor conditions. It's a full three days of waiting it out.

The next flicker of hope comes on Wednesday, August 13th. The morning is a bit average, but the afternoon is a real treat. The wind drops to nothing, going glassy, with a clean 7ft SW groundswell. The period is a long 16 seconds, which means proper, powerful lines. This is a standout moment for the more experienced crew.

Thursday the 14th and Friday the 15th offer a more manageable option. The swell drops to 5ft from the WSW, and the wind stays light and offshore or cross-offshore. The energy is a moderate 899, making for a much more user-friendly wave. This is a solid window for intermediates to get a piece of it.

We hit another dry patch from Saturday the 16th through to Sunday the 17th, with poor conditions and onshore winds making a mess of things.

Then, hold onto your boards. Monday, August 17th, is the absolute standout of the entire forecast. The morning brings a clean 8ft SW groundswell with a 16-second period, and a light offshore breeze. The energy is massive at 3738. This is proper, powerful surf. The afternoon is even better, going glassy flat. This is a session for the experts only, but it's a world-class day in the making if you can handle it.

Tuesday the 18th and Wednesday the 19th taper off a bit, with the swell dropping to 6ft and 5ft, but the winds remain light and the conditions clean. Good for a wider range of surfers.

The forecast for the end of the period, starting Thursday, August 20th, gets a bit heavy again. The swell builds back up, hitting 13ft on Thursday afternoon. That's a massive, dangerous wave. The energy is a staggering 5261. This is strictly for the elite, and even then, it's a huge call. The following days are a mix of onshore winds and messy conditions, making it look more like a kite-surfing day than a paddle session.

So, to sum it up: the best of the best is Monday, August 17th, with that glassy, long-period groundswell. The second pick is the window from Thursday 14th through Friday 15th for the smaller, cleaner swell. Get out there and grab it.

Rusty.

Short Range Forecast

Moderate rain (total 14mm), heaviest on Sat afternoon. Very mild (max 17°C on Sat afternoon, min 11°C on Sat morning). Winds increasing (light winds from the SSW on Sat night, fresh winds from the S by Sun afternoon).

Days 4-6 Weather Summary

Mostly dry. Warm (max 23°C on Thu afternoon, min 9°C on Tue night). Winds decreasing (fresh winds from the E on Tue night, calm by Thu afternoon).

Saturday
8
Sunday
9
Monday
10
Tuesday
11
Wednesday
12
Thursday
13
Friday
14
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
4
!
!
0
0
1
0
0
0
0
0
0
2
1
3
4
4
3
3
3
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2.5
SW
13
3.5
SW
14
3.5
SW
13
3.5
SW
12
3.5
SSW
12
2.5
SW
12
2.4
SSW
11
2
S
10
2.5
SSW
13
2.1
S
12
1.9
S
12
1.2
SW
22
1.6
SW
19
1.7
SW
18
1.4
SW
21
2.3
SW
17
2.1
SW
16
1.7
WSW
16
1.5
WSW
14
1.5
WSW
14
1.6
WSW
14
Wave Graph
Metric surfscale
Energy kJ
2158
4881
3587
3415
3338
1839
1338
755
2279
1290
963
1314
1727
1761
1750
3259
2160
1322
899
874
876
Wind (km/h)
15
NW
20
SSW
15
SSW
30
SSE
30
S
20
SSE
25
SE
25
ESE
25
E
35
E
35
E
25
ENE
20
ENE
15
ENE
20
NE
15
NE
0
WNW
15
NE
15
NNE
5
NNE
20
NNE
Wind State
off
cross
cross
cross-on
cross-on
cross-on
on
on
cross-on
cross-on
cross-on
cross-on
cross
cross-on
cross
cross
glassy
cross
cross-off
cross-off
cross-off
High Tide
11:33AM1.12m
11:57PM1.28m
12:51PM1.25m
1:08AM1.39m
1:47PM1.41m
2:02AM1.50m
2:34PM1.55m
2:49AM1.57m
3:16PM1.67m
3:31AM1.61m
3:54PM1.73m
4:09AM1.60m
4:31PM1.74m
4:46AM1.55m
Low Tide
5:37PM0.54m
6:35AM0.36m
6:59PM0.41m
7:35AM0.23m
7:58PM0.27m
8:23AM0.12m
8:47PM0.15m
9:04AM0.04m
9:30PM0.07m
9:42AM-0.00m
10:10PM0.04m
10:18AM0.00m
10:47PM0.05m
part cloud
rain showers
rain showers
light rain
rain showers
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:30
7:28
7:28
7:26
7:26
7:24
7:24
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:07
6:07
6:07
6:08
6:09
6:10
6:10
 mm
2
6
4
2
Temp °C
15
17
12
12
13
12
13
13
12
13
15
12
14
20
18
21
23
20
23
24
21
Feels °C
11
13
10
5
5
5
7
6
6
5
7
5
9
16
13
17
21
18
19
21
18
  • 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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