Onrus Surf Break

Lat Long: 34.41° S 19.17° E

Onrus Surf Forecast and Surf Report

Issued: 7 am 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: Monday 17 Aug, 2AM (local time) - 10ft (3.0m), 14s period, WSW swell with 2,830 kJ wave energy.
  • Next surfable swell (1★+): Sunday 16 Aug, 8PM (local time) - 8ft (2.4m), 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 8PM. The primary swell is predicted to be 2.4m 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 3.0m 14s and forecast to arrive on Monday (Aug 17) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Sunday (Aug 16) at 5PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 8PM (Sun 16th Aug)8ft (2.4m) 14s
Best Surf 2AM (Mon 17th Aug)10ft (3.0m) 14s
Most Powerful 2AM (Mon 17th Aug)10ft (3.0m) 14s

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


The Lowdown

Alright, Rusty here, and I’ve got the skinny on the next couple of weeks at Onrus. This reef is inconsistent, so don’t expect a wave every day, but when it lines up, it can be a real treat.

First up, the water is sitting at 57°, which is a bit colder than we usually see this time of year, so you’ll be wanting that thick wetsuit.

The action kicks off this Sunday, the 16th of August. Early morning, we’ve got a clean 6 ft swell rolling in from the WSW with a 13-second period, and a gentle offshore breeze from the WNW. The combined energy is moderate at 1074, and it’s looking excellent for those of you with some experience under your belt. Sunday afternoon sees the swell bump up to 6 ft, but the wind swings cross-offshore, making it a bit more marginal.

Monday the 17th is a standout. The morning brings a solid 8 ft swell from the WSW, 13-second period, and clean offshore winds from the NW. That’s proper groundswell territory, and the energy is strong at 2084. This is a session for the experienced crew, as the size is pushing into that expert-only zone. The wind stays clean through the afternoon, but the tide might be a factor.

We’ve got a few days of onshore winds from Tuesday the 18th through Thursday the 21st, with the swell hanging around 8 ft to 10 ft. The energy is all over the place, from moderate to strong, but the wind is junk, so it’s a bit of a write-off for clean waves. Thursday morning the 20th sees a 10 ft swell, but it’s just too big for this break, and the afternoon gets a solid zero from me.

Things finally clean up on Saturday the 22nd with a cross-offshore breeze and a 5 ft to 6 ft swell from the SW. The energy drops to 595, but it’s clean. Sunday the 23rd starts with a gentle cross-onshore, then gets blown out by a fresh onshore breeze in the afternoon.

Now, listen up, because the end of the month is looking interesting. On the 27th of August, Thursday morning, we’ve got excellent surf for experienced surfers. A 7 ft swell from the SW, 13-second period, and a clean cross-offshore wind from the W. The energy is strong at 2037. That afternoon is just as good.

Heading into the weekend, Saturday the 29th of August morning is another good one. An 8 ft swell from the SW, 13-second period, and clean cross-offshore winds. That’s a high-energy session at 2422.

Then we get a serious pulse of energy. Sunday the 30th of August morning has an 12 ft swell from the SW with a 15-second period, and a fresh offshore from the NW. The energy is a massive 5082. But it’s too big for this break, so only the bravest (and most experienced) should even think about it. The afternoon sees a 13 ft swell, and Monday the 31st is still pumping at 10 ft with clean cross-offshore winds. Again, all too big for the average punter.

So, for the best of the best, I’d be locking in Monday the 17th of August morning, and then again on Thursday the 27th of August. The weekend of the 30th is a beast, but it’s one for the experts only.

Rusty, out.

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 4-6 Weather Summary

Mostly dry. Very mild (max 16°C on Thu afternoon, min 10°C on Thu night). Wind will be generally light.

Sunday
16
Monday
17
Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
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
3
!
4
3
4
3
1
2
3
3
3
!
0
1
3
1
2
2
2
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.7
WSW
13
1.9
WSW
14
3
WSW
14
2.5
WSW
13
2.4
WSW
13
2.1
WSW
13
2.4
WSW
12
2.5
SW
13
2.5
SW
12
2.4
SW
12
2.3
SW
12
2.3
SW
12
3
SW
13
3
SW
13
2.3
SW
12
2
SW
11
1.8
SW
11
1.5
SW
11
1.6
SW
11
1.9
SW
10
1.8
SW
10
Wave Graph
Metric surfscale
Energy kJ
1074
1525
2830
2084
1930
1575
1688
2326
2044
1665
1451
1617
2496
2574
1451
969
729
487
595
759
721
Wind (km/h)
10
WNW
20
W
10
NNW
10
NW
15
W
10
WSW
5
SE
20
SSE
10
E
10
SSW
10
S
10
ENE
15
ESE
25
SE
20
ENE
5
SE
10
S
10
NW
20
WNW
25
WNW
10
SSW
Wind State
off
cross-off
cross-off
off
cross-off
cross-off
on
on
cross-on
cross
cross-on
cross
on
on
cross-on
on
cross-on
off
cross-off
cross-off
cross
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
11:25AM0.15m
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
part cloud
clear
part cloud
part cloud
cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:22
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
Temp °C
17
19
16
19
18
15
15
16
13
14
15
13
14
16
12
14
16
13
17
18
16
Feels °C
14
15
13
17
14
14
14
13
10
13
15
11
11
12
8
13
14
13
13
14
14
  • Map Icons:
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  • 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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