Onrus Surf Break

Lat Long: 34.41° S 19.17° E

Onrus Surf Forecast and Surf Report

Issued: 1 pm 16 Aug 2026 (local time)

Forecast update in  hr  min

Today's Onrus sea temperature is
14.1° C
1.6° 

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


Onrus surf forecast from 16 Aug 2026:

  • Best quality surf: Monday 17 Aug, 2AM (local time) - 10ft (3.0m), 14s period, WSW swell with cross-offshore winds.
  • Most powerful swell: Sunday 23 Aug, 11AM (local time) - 13ft (4.0m), 16s period, SW swell with 8,390 kJ wave energy.
  • Next surfable swell (1★+): Sunday 16 Aug, 11PM (local time) - 8ft (2.5m), 14s 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 Sunday (Aug 16) at 11PM. The primary swell is predicted to be 2.5m and 14s period. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Onrus in the next 16 days are 4.0m 16s and forecast to arrive on Sunday (Aug 23) at 11AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 4s period and expected on Saturday (Aug 22) at 11AM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+)11PM (Sun 16th Aug)8ft (2.5m) 14s
Best Surf 2AM (Mon 17th Aug)10ft (3.0m) 14s
Most Powerful11AM (Sun 23rd Aug)13ft (4.0m) 16s

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


The Lowdown

Alright, Rusty here. Let’s talk about what’s coming our way for Onrus.

First up, things kick off on Sunday, the 16th of August, with a bit of a slow start. We’ve got some 6ft swell from the WSW, period around 14 seconds – that’s a nice groundswell pulse, but the wind is a cross-off at 16 mph, and it’s making things feel a little marginal. The water’s sitting at 57°, which is a bit colder than normal for this time of year, so you’ll want a good steamer. The combined swell energy is pretty strong, reading 1525. Not a total write-off, but not the best of the run.

The real standout here is Monday morning, the 17th. Onrus is a reef setup, and with an 8ft WSW swell at 13 seconds, and a clean offshore wind from the NW at 9 mph – that’s proper. The energy jumps to 2084, and the conditions are described as excellent for experienced surfers. This is the pick of the week for sure. Swell direction matches the optimum SW direction, and it’s going to be clean. Just be aware, crowds are sometimes an issue here.

Tuesday the 18th and Wednesday the 19th see the swell holding around 8ft from the SW, but the wind turns onshore or cross-shore, so it gets messy. Not worth getting excited about. Thursday the 20th, the swell jumps to 10ft from the SW, but that’s actually too big for this break, and the wind is onshore by afternoon. Friday the 21st is smaller again, around 7ft, but still a bit choppy.

Saturday the 22nd has a strange one – morning wind is a strong offshore NW at 22 mph with 5ft swell, but the energy is low at 469, and the score is poor. Then Saturday afternoon, the swell jumps back to 10ft from the SW with an 19 mph offshore, but again, it’s too big for the break.

Sunday the 23rd and Monday the 24th are absolute monsters – 13ft and 12ft swells from the SW, with very long periods up to 16 seconds. That’s serious energy (8684 on Sunday morning), but it’s way too big for Onrus. Not for paddling.

After that, the surf settles down through the end of the month. There’s a nice moment on Saturday morning, the 29th of August – 8ft swell from the SW, period 13 seconds, and glassy conditions with a 3 mph SW wind. That’s another solid window for experienced surfers. The energy is 1656, and it’s clean. That’s your second standout.

Sunday the 30th has a 7ft morning with offshore winds, decent, but then the wind changes. Monday the 31st sees another big pulse – 12ft from the SW – but the wind is cross-on and the conditions are poor.

Overall, the best bets are Monday the 17th and Saturday the 29th – both mornings, both clean or glassy, with solid groundswell. Onrus is an exposed reef that can get crowded when it’s good, and it’s inconsistent, so when it lines up, you want to be there.

Rusty.

Short Range Forecast

Mostly dry. Very mild (max 19°C on Sun afternoon, min 11°C on Tue night). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Very mild (max 18°C on Fri afternoon, min 10°C on Thu night). Winds increasing (calm on Wed night, fresh winds from the NW by Sat morning).

Sun
16
Monday
17
Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
3
!
4
3
4
3
1
2
3
3
4
!
0
1
2
3
2
1
!
!
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
WSW
14
3
WSW
14
2.5
WSW
13
2.4
WSW
13
2.1
WSW
13
2.4
SW
12
2.5
SW
13
2.5
SW
12
2.4
SW
12
2.3
SW
12
2.5
SW
13
3
SW
13
3
SW
13
2.3
SW
12
2
SW
11
1.9
SW
11
1.1
SSW
11
1.5
SW
10
3
SW
12
3.5
SW
13
Wave Graph
Metric surfscale
Energy kJ
1525
2830
2084
1930
1575
1768
2326
2148
1665
1451
1908
3174
2576
1427
952
806
281
469
2078
3844
Wind (km/h)
25
W
10
N
15
NW
20
W
10
W
10
SSE
20
SE
15
E
10
SSW
10
SW
5
N
10
E
20
SE
20
E
15
E
10
SSE
20
WNW
35
NW
30
WNW
20
W
Wind State
cross-off
cross-off
off
cross-off
cross-off
on
on
cross-on
cross
cross
cross-off
cross-on
on
cross-on
cross-on
cross-on
cross-off
off
off
cross-off
High Tide
5:39PM1.60m
5:55AM1.37m
6:12PM1.47m
6:30AM1.25m
6:46PM1.33m
7:08AM1.13m
7:25PM1.19m
7:59AM1.02m
8:25PM1.07m
9:40AM0.94m
10:21PM1.01m
11:56AM0.98m
00:08AM1.06m
Low Tide
11:57PM0.21m
11:56AM0.26m
00:31AM0.33m
12:28PM0.39m
1:06AM0.45m
1:02PM0.53m
1:50AM0.57m
1:50PM0.65m
3:11AM0.66m
3:39PM0.74m
5:33AM0.65m
6:08PM0.70m
clear
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
cloud
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:20
7:20
7:18
7:16
7:16
7:15
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:13
6:13
6:14
6:15
6:15
6:15
6:16
 mm
1
Temp °C
19
16
19
19
15
15
15
13
14
15
13
15
15
13
16
18
13
16
17
15
Feels °C
14
13
17
15
14
14
13
10
12
13
12
13
11
9
14
16
12
9
10
10
  • 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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