
Surf Forecasts:
Onrus surf forecast from 10 Sep 2026:
- Best quality surf: Wednesday 16 Sep, 2AM (local time) - 10ft (3.0m), 16s period, SW swell with cross-shore winds.
- Most powerful swell: Wednesday 16 Sep, 2AM (local time) - 10ft (3.0m), 16s period, SW swell with 4,587 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 2AM (local time) - 4.5ft (1.3m), 13s 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 Monday (Sep 14) at 2AM. The primary swell is predicted to be 1.3m and 13s period with a secondary swell of 1.1m and 8s. 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 3.0m 16s and forecast to arrive on Wednesday (Sep 16) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Tuesday (Sep 15) at 11AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Mon 14th Sep) | 4.5ft (1.3m) 13s |
| Best Surf | 2AM (Wed 16th Sep) | 10ft (3.0m) 16s |
| Most Powerful | 2AM (Wed 16th Sep) | 10ft (3.0m) 16s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Awright, gather 'round. Rusty here, lookin' at what we've got for the next couple of weeks. It's a bit of a mixed bag, with some real promise if you're patient and know where to look.
We're starting with some decent-sized swell, but the wind's going to be a headache for a while. The water temp is sittin' around 59°, which is just about what you'd expect for this time of year, nothin' too wild.
The main event is definitely Onrus, a reef break that's exposed to the southwest. We've got a solid run of energy comin' in, but you gotta pick your moments. The combined swell energy is through the roof on the 10th, clocking in at 2061, with a solid 7ft SW groundswell. It’ll be pretty clean, but the cross-on wind will bump it up a bit. That's the kick-off.
The next few days are a write-off, honestly. From Friday the 11th right through Sunday the 13th, the wind is gonna be onshore or cross-onshore and howlin', making a mess of things. The energy is there, but the conditions are just too ugly. Best to give it a miss.
But then, things clean up. Monday the 14th of September is where we see a shift. The wind goes offshore from the NW, with 3ft to 4ft of SW groundswell. The afternoon especially, with a moderate offshore and a score of 504 for energy, is looking beautiful for a longer board or a fish. Keep an eye on the tide, but this is a good one.
Tuesday the 15th has some more swell, but the wind gets gnarly. We're talkin' 25-31 mph offshore winds. The swell is there (5ft at 17 seconds in the afternoon, energy at 2075), but paddlin' out is gonna feel like a mission. It's a session for the locals who know the lineup and can handle a fight.
Now, here comes the big stuff. Wednesday the 16th of September we get a serious pulse of SW groundswell, 10ft high, with an energy reading of 3968. The wind is light and variable, but honestly, this is too much for most at Onrus. For the average surfer, it's a no-go. This is for experts only – the power is immense and it'll be a handful.
After that, it blows out again until we hit Friday the 18th of September. A real standout in the second week. The wind is a soft offshore from the NNE, only 3 mph, clean as a whistle. We've got 4ft of SW groundswell, energy of 418. It's not the biggest, but it'll be lined up and fun, with no wind to chop it up. A prime pick for a longboard or a mid-length.
The weekend of the 19th and 20th looks messy again, with onshore winds and lumpy conditions, though there's plenty of energy in the water.
Then, another massive pulse hits on Monday the 21st of September. We're talkin' 12ft of SW groundswell, a massive 5255 energy, and the wind is glassy. It's breathtaking to think about, but again, for Onrus, that's a big, intimidating wave. Only the most experienced chargers should even think about it.
The outlook for the final week of the forecast period (22nd to 25th) is a bit of a mixed story. The wind is messy again through the 22nd and 23rd. But then, Thursday the 24th of September offers a clean session with a light, cross-offshore wind from the WSW. 4ft of SW swell with 609 energy – good for a cruiser. And Friday the 25th of September is the real cherry on top. The morning shows a clear sky, a slight WSW airflow, and 7ft of clean SW groundswell (energy of 1276), described as "excellent surf conditions for experienced surfers". That's your call to arms. The afternoon bumps up a tiny bit in size but the cross-on wind makes it less appealing. Lock in that Friday morning.
So, if you're lookin' for the best, circle Monday the 14th of September afternoon for a clean, fun session, and Friday the 25th of September morning for the best, cleanest, most powerful swell that's still manageable for the experienced surfer. The big stuff on the 16th and 21st is for the hardcore crew only.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Sat morning. Very mild (max 17°C on Thu morning, min 14°C on Thu morning). Winds increasing (light winds from the ESE on Thu morning, strong winds from the E by Sat night). | Days 4-6 Weather SummaryHeavy rain (total 35mm), heaviest during Tue night. Very mild (max 18°C on Mon morning, min 12°C on Tue night). Winds increasing (light winds from the NE on Sun night, strong winds from the NW by Tue afternoon). | ||||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | SW 15 | SW 13 | WSW 13 | WSW 12 | SW 12 | WSW 12 | SW 15 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 12 | SW 12 | SW 12 | SW 19 | SW 17 | SW 16 | SW 14 | SW 13 | SW 13 |
Wave Graph | |||||||||||||||||||||
2061 | 1648 | 1162 | 878 | 694 | 353 | 1661 | 2909 | 2066 | 1220 | 865 | 537 | 335 | 268 | 190 | 369 | 1573 | 4587 | 3968 | 2693 | 2145 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-off | off | off | off | off | off | cross | cross-on | cross | cross-on |
High Tide | 2:53PM1.70m | 3:11AM1.59m | 3:27PM1.75m | 3:45AM1.60m | 3:59PM1.73m | 4:17AM1.56m | 4:30PM1.67m | 4:48AM1.49m | 4:59PM1.58m | 5:18AM1.40m | 5:29PM1.45m | 5:48AM1.29m | 5:59PM1.31m | ||||||||
Low Tide | 8:44AM0.06m | 9:11PM0.03m | 9:17AM0.03m | 9:45PM0.00m | 9:49AM0.04m | 10:16PM0.03m | 10:20AM0.09m | 10:46PM0.09m | 10:49AM0.17m | 11:15PM0.19m | 11:18AM0.28m | 11:43PM0.30m | 11:46AM0.40m | 00:13AM0.43m | |||||||
6:50 | — | — | 6:48 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:43 | — | — | 6:41 | — | — | |
— | 6:30 | — | — | 6:30 | — | — | 6:31 | — | — | 6:31 | — | — | 6:32 | — | — | 6:34 | — | — | 6:35 | — | |
mm | — | — | — | — | — | — | 1 | 2 | 3 | 2 | 3 | 9 | 3 | — | — | — | — | 18 | — | — | — |
Temp °C | 17 | 17 | 15 | 16 | 17 | 16 | 16 | 17 | 16 | 16 | 17 | 17 | 18 | 17 | 16 | 17 | 18 | 16 | 15 | 15 | 13 |
Feels °C | 17 | 16 | 15 | 12 | 12 | 12 | 13 | 14 | 10 | 12 | 15 | 16 | 12 | 12 | 12 | 10 | 10 | 9 | 10 | 11 | 11 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 13 | WSW 13 | WSW 12 | SW 12 | WSW 12 | SW 15 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 12 | SW 12 | SW 12 | SW 11 | SW 17 | SW 16 | SW 14 | SW 13 | SW 13 |
2061 | 1648 | 1162 | 878 | 694 | 353 | 1661 | 2909 | 2066 | 1220 | 865 | 537 | 335 | 268 | 190 | 177 | 1573 | 4587 | 3968 | 2693 | 2145 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | SSW 10 | — | — | — | SE 8 | SE 9 | SSE 8 | SE 11 | WNW 7 | SE 11 | SW 19 | ESE 12 | ESE 11 | E 11 | E 11 | SSW 20 |
— | — | — | — | — | 86 | — | — | — | 84 | 81 | 138 | 103 | 48 | 20 | 369 | 109 | 40 | 9 | 9 | 37 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | SW 15 | — | — | — | — | — | — | — | SE 11 | WNW 9 | ESE 12 | — | — | — | — | — |
— | — | — | — | — | 134 | — | — | — | — | — | — | — | 46 | 7 | 15 | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | SSE 7 | SSE 7 | SE 7 | SE 6 | SE 7 | SE 7 | SE 7 | SSE 7 | — | WNW 6 | WNW 7 | WNW 5 | WNW 6 | WNW 7 | — | — | — | E 10 |
— | — | — | 166 | 198 | 114 | 113 | 128 | 246 | 121 | 108 | — | 34 | 142 | 44 | 173 | 502 | — | — | — | 8 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 23 | 83 | 10 | 91 | 941 | 4 | 40 | 95 | 38 | 38 | 4 | 0 | 250 | 0 | 155 | 199 | 206 | 38 | 83 | 32 | 10 |
Best forecast wave conditions in Overberg | |||||||||||||||||||||
Best forecast wave conditions in South Africa | |||||||||||||||||||||
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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.










