Onrus Surf Break

Lat Long: 34.41° S 19.17° E

Onrus Surf Forecast and Surf Report

Issued: 1 am 29 Aug 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 29 Aug 2026:

  • Best quality surf: Tuesday 1 Sep, 5PM (local time) - 10ft (3.0m), 13s period, SW swell with cross-offshore winds.
  • Most powerful swell: Wednesday 2 Sep, 2AM (local time) - 10ft (3.0m), 14s period, SW swell with 3,518 kJ wave energy.
  • Next surfable swell (1★+): Saturday 29 Aug, 8AM (local time) - 3.5ft (1.1m), 13s period with WSW 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 29) at 8AM. The primary swell is predicted to be 1.1m and 13s period with a secondary swell of 0.8m 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 3.0m 14s and forecast to arrive on Wednesday (Sep 02) at 2AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 9s period and expected on Saturday (Aug 29) at 2PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Sat 29th Aug)3.5ft (1.1m) 13s
Best Surf 5PM (Tue 1st Sep)10ft (3.0m) 13s
Most Powerful 2AM (Wed 2nd Sep)10ft (3.0m) 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 coming up for Onrus over the next couple of weeks.

We’re kicking off with a bit of a slow start. Saturday the 29th and Sunday the 30th are pretty average. The swell is there, but conditions are all over the shop. Saturday morning has a 4ft swell from the WSW with a 13-second period, but it’s cloudy with a cross-off wind and the energy is weak (705). The afternoon turns into a mess with some rain and a 7ft SW swell that’s cross-shore and choppy, and the energy is moderate (1835). Sunday morning cleans up with a clear sky and a 8ft SW swell, but the onshore wind and energy (1583) still don’t make it a great paddle. Sunday afternoon stays full and choppy. Not worth rushing out for.

Now we get to the good stuff. Monday the 31st is where it starts to turn. The morning is glassy, absolute perfection. That 6ft SW swell with an 11-second period and low energy (830) will be clean and fun. A real treat for those who can get out. The afternoon is still decent with a 6ft SW swell, but a light cross-shore wind gives it a little ripple.

Then Tuesday the 1st of September. This is a standout. The morning has an 8ft SW swell with a 13-second period and offshore wind. The energy is strong (2031). It’s clean and powerful. This is for experienced surfers only – it’s a solid size. The afternoon gets even bigger at 10ft, but it’s a bit too much for the break and the wind turns cross-off. Still, the morning window is the pick of the first week.

Things get blown out from Wednesday the 2nd through to Saturday the 5th. Strong onshore and cross-on winds, rising energy numbers (up to 3020 on Wednesday morning), but the quality is poor. A lot of chop and not much fun. The surf is around 7ft to 10ft for most of that, but it’s messy. If you’re into kiting, this might be your window, but for paddle surfing, it’s a miss.

Sunday the 6th of September brings a change. The morning is glassy again with a 5ft SW swell and a very long 15-second period. The energy is moderate (1107). That long period groundswell will be better for the reef, but it might close out on the beach. Still, it’s clean and inviting. The afternoon has a 4ft SW swell with offshore wind, so it’s a solid day.

The second week has a couple of serious highlights. Tuesday the 12th of September is a big one. Morning has a 7ft WSW swell with a 14-second period and offshore wind, energy is strong (1894). The afternoon is also excellent with the same size but a cross-off wind. Both sessions are clean and powerful. Then Sunday the 13th of September is the real standout of the whole outlook. Morning has a 8ft SW swell with a 13-second period, light cross-off wind, and energy is strong (2036). The afternoon matches it. This is the best on offer – clean, solid, and consistent. It’s for experienced surfers.

The water temperature is sitting at 59°F, which is about 1°F cooler than usual for this time of year. That’s not a big deal, just a little on the fresh side, so grab a thicker wetsuit.

Remember, Onrus is a reef break that’s inconsistent and can get crowded sometimes. It’s exposed to the SW swell, which is exactly what we’re getting. The optimum swell direction is from the SW, so these swells are lining up perfectly.

So, the pick of the windows: Monday the 31st of August morning for a glassy session, and Sunday the 13th of September all day for the biggest, cleanest, and most powerful waves. The long-range stuff around the 12th and 13th is promising, but keep an eye on it – it’s a bit further out.

Rusty.

Short Range Forecast

Light rain (total 2mm), mostly falling on Sat afternoon. Very mild (max 16°C on Sat morning, min 9°C on Sun night). Winds decreasing (fresh winds from the SW on Sat afternoon, calm by Mon night).

Days 4-6 Weather Summary

Light rain (total 8mm), mostly falling on Thu morning. Very mild (max 17°C on Wed afternoon, min 11°C on Tue morning). Winds increasing (calm on Tue night, strong winds from the ESE by Thu night).

Saturday
29
Sunday
30
Monday
31
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
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
2
0
3
3
2
4
4
!
!
!
0
2
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
WSW
13
2
SW
10
2.1
SW
9
2.3
SW
12
2.3
SW
12
2.1
SW
12
1.8
SW
11
1.7
SW
11
1.8
SW
11
2.5
SW
13
3
SW
13
3
SW
14
3
SW
14
2.5
SW
13
2.3
SW
13
2.1
SW
12
2
SW
12
2.4
S
9
2
S
10
1.5
SSW
11
1.3
SSW
11
Wave Graph
Metric surfscale
Energy kJ
414
769
645
1572
1444
1162
828
702
778
2031
2873
3518
3020
2376
1791
1363
1088
1009
857
527
419
Wind (km/h)
15
NNE
20
SSW
15
S
15
SE
20
SSE
15
NE
5
SSE
10
SW
5
NNW
10
NW
15
WNW
10
ESE
20
E
25
SE
15
E
40
SE
35
ESE
40
ESE
45
E
55
E
40
E
Wind State
cross-off
cross
cross-on
on
cross-on
cross
glassy
cross
cross-off
off
cross-off
on
cross-on
on
cross-on
on
on
cross-on
cross-on
cross-on
cross-on
High Tide
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
7:53AM1.12m
8:28PM1.19m
Low Tide
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
1:53PM0.55m
3:13AM0.54m
cloud
light rain
rain showers
part cloud
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
cloud
cloud
cloud
light rain
rain showers
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:05
7:05
7:03
7:01
7:01
7:00
6:58
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:22
6:22
6:22
6:23
6:24
6:24
6:25
 mm
1
1
5
3
Temp °C
16
16
14
14
14
12
12
13
11
14
16
15
14
17
14
14
15
14
15
16
13
Feels °C
13
11
12
10
9
8
10
10
9
13
14
13
11
14
11
9
8
7
5
5
3
  • 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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