
Surf Forecasts:
Onrus surf forecast from 8 Sep 2026:
- Best quality surf: Sunday 13 Sep, 8PM (local time) - 7.5ft (2.3m), 9s period, SSW swell with cross-offshore winds.
- Most powerful swell: Saturday 12 Sep, 8PM (local time) - 7.5ft (2.3m), 16s period, SW swell with 2,602 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 11AM (local time) - 3ft (0.9m), 12s 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 Tuesday (Sep 08) at 11AM. The primary swell is predicted to be 0.9m and 12s period with a secondary swell of 0.9m 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 2.3m 16s and forecast to arrive on Saturday (Sep 12) at 8PM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Tue 8th Sep) | 3ft (0.9m) 12s |
| Best Surf | 8PM (Sun 13th Sep) | 7.5ft (2.3m) 9s |
| Most Powerful | 8PM (Sat 12th Sep) | 7.5ft (2.3m) 16s |
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 on the table for the next couple of weeks.
We’re looking at a solid run of clean, rideable surf kicking off tomorrow morning at Onrus. This is a reef break, exposed to the SW, and it’s inconsistent – so don’t expect a conveyor belt, but when the sets come through, they’ll be worth it. The water temp is about average for this time of year. We start Tuesday morning, 8 September, with a clean 3ft swell from the WSW at a solid 12 seconds, and the wind is a light cross-offshore breeze. The combined energy is moderate (481). It’s a nice little start. Tuesday afternoon goes glassy, with a light southerly breeze and 3ft swell – that’s about as clean as it gets.
Wednesday morning, 9 September, is the real standout of the first half of the week. Glassy conditions again, with a 3ft, 13-second swell from the WSW. The energy is a touch lower (369) but with that period, the waves will have some shape. This is the pick of the bunch for the early days. The wind is a slight air, meaning it’s almost flat calm. It’s a great time to be out there, but keep in mind Onrus can get crowded sometimes.
The next few days get a bit messy. Thursday, 10 September, sees a jump in size to 7ft from the SW, but the wind goes onshore and the conditions are lumpy. The energy is very strong (2089) but it’s not surfable for the average punter. Friday and Saturday are a write-off with strong onshore winds and poor conditions.
Now, things start to get interesting again. On Monday, 14 September, a moderate offshore NW wind kicks in, cleaning up a 4ft, 12-second SW swell. The energy is moderate (937) and the sets will be clean. It’s a nice turn-around. Then Tuesday, 15 September, gets a bit wild. The morning is still clean with offshore winds and a 3ft swell, but the afternoon sees a massive jump in period to 25 seconds! That’s a very long period groundswell at 6ft, with a fresh offshore wind. The energy is extreme (4376). At a reef break like Onrus, this could be incredible – long, walling lines. But the conditions are listed as marginal, so it might be a bit of a challenge with the tide. Still, if you’re an experienced surfer, that afternoon session on Tuesday, 15 September, is a major standout.
The following Wednesday, 16 September, is also a big one but it’s getting too big. The swell hits 15ft from the WSW with a 17-second period, and it’s clean with cross-offshore wind. The energy is enormous (11546). But this is expert territory only – that size is dangerous for most. The same goes for the 20 September and 21 September swells – too big for the break.
After that, the swell drops back, but conditions stay poor with onshore winds right through to the end of the forecast on 23 September. The last few days offer a small 4ft, 12-second swell on the 23rd, but with cross-on wind, it’s not going to be much fun.
So, in summary: the best windows are the glassy Wednesday morning, 9 September, and the long-period, offshore session on Tuesday afternoon, 15 September. The rest is a mixed bag of onshore slop or massive, dangerous swell.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Tue morning, min 14°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Fri night. Very mild (max 19°C on Sun morning, min 14°C on Thu night). Winds decreasing (fresh winds from the SE on Fri afternoon, light winds from the SSW by Sun afternoon). | ||||||||||||||||||
Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | ||||||||||||||
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) | WSW 13 | WSW 12 | WSW 11 | SW 11 | WSW 13 | WSW 13 | SW 12 | SW 15 | SW 14 | SW 13 | WSW 12 | SW 12 | WSW 12 | SW 14 | SW 16 | SW 15 | SW 14 | SSW 9 | SW 13 |
Wave Graph | |||||||||||||||||||
389 | 251 | 163 | 169 | 304 | 295 | 667 | 2089 | 1697 | 1408 | 746 | 578 | 365 | 1119 | 1602 | 2229 | 1507 | 971 | 721 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | glassy | cross-on | glassy | cross-on | cross-on | on | cross-on | on | cross-on | on | cross-on | on | on | cross-on | cross-on | cross-on | cross-off |
High Tide | 1:08AM1.36m | 1:37PM1.47m | 1:55AM1.47m | 2:17PM1.61m | 2:35AM1.55m | 2:53PM1.70m | 3:11AM1.59m | 3:27PM1.75m | 3:45AM1.60m | 3:59PM1.73m | 4:17AM1.56m | 4:30PM1.67m | 4:48AM1.49m | ||||||
Low Tide | 7:26AM0.25m | 7:53PM0.22m | 8:07AM0.13m | 8:34PM0.10m | 8:44AM0.06m | 9:11PM0.03m | 9:17AM0.03m | 9:45PM0.00m | 9:49AM0.04m | 10:16PM0.03m | 10:20AM0.09m | 10:46PM0.09m | |||||||
— | 6:52 | — | — | 6:52 | — | — | 6:50 | — | — | 6:48 | — | — | 6:47 | — | — | 6:46 | — | — | |
6:28 | — | 6:29 | — | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 6:31 | — | — | 6:31 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | 4 | 1 | — | — |
Temp °C | 21 | 25 | 22 | 21 | 20 | 19 | 15 | 17 | 18 | 15 | 15 | 16 | 15 | 17 | 17 | 16 | 19 | 19 | 17 |
Feels °C | 19 | 25 | 22 | 21 | 21 | 18 | 15 | 16 | 16 | 14 | 10 | 11 | 10 | 15 | 14 | 12 | 19 | 19 | 18 |
Swell 1 Height (m) Direction Period (s) | SSW 12 | WSW 12 | WSW 11 | SW 11 | WSW 13 | WSW 13 | SW 12 | SW 15 | SW 14 | SW 13 | WSW 12 | SW 12 | WSW 12 | SW 14 | SW 16 | SW 15 | SW 14 | SSW 9 | S 8 |
355 | 251 | 163 | 142 | 304 | 295 | 667 | 2089 | 1697 | 1408 | 746 | 578 | 365 | 1119 | 1602 | 2229 | 1507 | 705 | 517 | |
Swell 2 Height (m) Direction Period (s) | WSW 13 | S 11 | S 10 | SW 14 | SSE 9 | SSE 8 | SW 16 | — | — | — | S 7 | — | SW 14 | S 8 | S 9 | SSE 9 | S 8 | SW 13 | SW 13 |
389 | 188 | 94 | 169 | 26 | 6 | 133 | — | — | — | 210 | — | 206 | 251 | 506 | 463 | 135 | 778 | 591 | |
Swell 3 Height (m) Direction Period (s) | SE 10 | SW 16 | SW 16 | SSE 9 | S 8 | SSE 10 | SSE 9 | — | — | — | — | — | SSW 10 | — | SW 18 | — | SE 9 | SE 9 | SW 13 |
4 | 42 | 62 | 26 | 1 | 9 | 8 | — | — | — | — | — | 40 | — | 460 | — | 93 | 52 | 721 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | SE 9 | S 3 | — | — | — | S 6 | SSE 7 | SSE 7 | SSE 7 | SSE 8 | SSE 8 | — | — | SSW 9 | — |
— | — | — | — | 38 | 3 | — | — | — | 161 | 331 | 233 | 168 | 422 | 921 | — | — | 971 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 4 | 0 | 0 | 4 | 0 | 83 | 4 | 23 | 23 | 38 | 91 | 335 | 4 | 4 | 221 | 10 | 4 | 10 | 0 |
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.










