Onrus Surf Break

Lat Long: 34.41° S 19.17° E

Onrus Surf Forecast and Surf Report

Issued: 7 pm 27 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), 12s period, SW swell with cross-offshore winds.
  • Most powerful swell: Wednesday 2 Sep, 8AM (local time) - 16ft (5.0m), 19s period, SW swell with 16,528 kJ wave energy.
  • Next surfable swell (1★+): Friday 28 Aug, 5AM (local time) - 4ft (1.2m), 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 5AM. The primary swell is predicted to be 1.2m and 11s period with a secondary swell of 0.6m and 11s. 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 5.0m 19s and forecast to arrive on Wednesday (Sep 02) at 8AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Tuesday (Sep 01) at 5PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Fri 28th Aug)4ft (1.2m) 11s
Best Surf 2AM (Wed 2nd Sep)10ft (3.0m) 12s
Most Powerful 8AM (Wed 2nd Sep)16ft (5.0m) 19s

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


The Lowdown

G’day, Rusty here. We’ve got a solid run of surf coming up at Onrus, but you’ll need to pick your moments. This reef break is inconsistent and exposed to the SW, so when it lines up, it’s worth the wait.

The water temp is sitting about average for this time of year, nothing weird going on.

The action starts Friday morning the 28th. It’s not huge, but a clean 4ft S swell with a bit of period – 11 seconds – and light cross-offshore wind will have it looking tidy. The combined energy is moderate (493). Not a standout, but a nice way to ease into the weekend.

Friday afternoon, the swell drops to 3ft, WSW direction, but the period stretches out to 14 seconds. Glassy conditions with that offshore breeze – it’ll be clean but small. Good for a longboard or a fun log.

Saturday morning the 29th is where it gets interesting. Glassy again, 4ft WSW swell at 13 seconds, and the energy bumps up to moderate-high (705). This is your pick of the first few days – clean, fun, and the reef will be working.

Saturday afternoon goes downhill fast. S swell jumps to 6ft, but it’s a 12 mph cross-onshore and the window closes quick. Choppy and messy.

Sunday the 30th is a write-off – strong onshore wind, 8ft SW swell with a 12-second period, but the energy is getting high (1717). Too windy, too messy.

Monday the 31st morning is a beauty. Clean offshore wind from the WNW, 6ft SW swell at 11 seconds. Moderate energy (828), clean lines, and the reef will be handling it nicely. That’s a proper session.

Tuesday the 1st of September morning: 8ft SW swell, 13-second period, cross-offshore breeze. Energy is strong (1915). This is getting solid, but the wind is clean – intermediate surfers should handle it, but beginners might find it a bit much.

Wednesday the 2nd is the standout warning. Massive 16ft SW swell at 17 seconds – very long period, very long gaps. The energy is extreme (14059). This is expert territory only, and the cross-onshore wind Wednesday morning makes it look mean. Wednesday afternoon it’s too big even for the reef, with 13ft swell and onshore wind.

Thursday the 3rd through to Wednesday the 9th is a long stretch of poor conditions – strong onshore winds, messy chop, and swells that don’t line up. A real lull.

Then we get a diamond on Saturday the 5th of September morning. Light offshore wind, 4ft SSE swell with a 14-second period. The combined energy is moderate-high (1355). That’s going to be clean, lined up, and with that long period, the reef will be holding deep, smooth waves. This is the other standout – perfect for experienced surfers.

Sunday the 6th morning: moderate offshore wind, 3ft SW swell at 17 seconds – very long period again. Energy is moderate (770). Clean, but the long period means it may stand up fast on the reef. Still a good paddle out.

After that, the window closes with a few days of onshore crud and small swell, wrapping up by the 12th.

The two best sessions? Saturday morning the 29th for a glassy, fun 4ft ride, and Saturday morning the 5th of September for the real quality – clean, 4ft, and that nice SSE groundswell. Don’t sleep on those.

Rusty.

Short Range Forecast

Light rain (total 3mm), mostly falling on Sat afternoon. Very mild (max 18°C on Fri morning, min 12°C on Sun morning). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Very mild (max 17°C on Tue afternoon, min 11°C on Mon night). Winds increasing (light winds from the NW on Mon night, fresh winds from the W by Tue afternoon).

Friday
28
Saturday
29
Sunday
30
Monday
31
Tuesday
1
Wednesday
2
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
3
2
2
1
3
1
2
1
1
3
3
2
3
3
2
!
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)
1.3
S
11
1.1
S
11
0.8
WSW
14
1
WSW
13
1.1
WSW
13
1.7
WSW
14
1.4
WSW
13
2.4
SW
12
2.2
SW
12
1.9
SW
12
1.8
SW
11
1.7
SW
11
2.1
SW
11
2.4
SW
13
2.2
SW
13
3
SW
12
5
SW
17
4
SW
15
3.5
SW
14
Wave Graph
Metric surfscale
Energy kJ
410
279
239
302
414
1227
659
1706
1392
1029
828
702
981
1915
1569
2451
14059
7887
3963
Wind (km/h)
10
W
5
WSW
5
ESE
5
SW
5
NW
20
SSW
10
SSE
15
ESE
15
SSE
10
SSW
20
WNW
15
W
10
NNE
15
WNW
35
W
25
WSW
20
SSW
20
SSE
30
E
Wind State
cross-off
cross-off
glassy
cross
glassy
cross-on
cross-on
on
on
cross
off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-on
on
cross-on
High Tide
3:15AM1.52m
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
Low Tide
9:17PM0.18m
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
part cloud
clear
part cloud
cloud
cloud
light rain
light rain
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
part cloud
cloud
cloud
cloud
<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
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:21
6:21
6:22
6:22
6:22
6:23
6:24
 mm
1
2
Temp °C
17
18
17
17
16
18
13
13
14
13
14
15
13
15
17
15
14
13
12
Feels °C
17
17
17
16
16
17
10
9
9
9
9
10
11
11
11
10
9
8
6
  • 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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