
Surf Forecasts:
Onrus surf forecast from 7 Sep 2026:
- Best quality surf: Monday 7 Sep, 8PM (local time) - 6ft (1.8m), 13s period, SW swell with glassy winds.
- Most powerful swell: Thursday 10 Sep, 11AM (local time) - 8ft (2.4m), 15s period, SW swell with 2,590 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 8PM (local time) - 6ft (1.8m), 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 07) at 8PM. The primary swell is predicted to be 1.8m and 13s period with a secondary swell of 1.3m and 12s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Onrus in the next 16 days are 2.4m 15s and forecast to arrive on Thursday (Sep 10) at 11AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 8s period and expected on Saturday (Sep 12) at 8PM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Mon 7th Sep) | 6ft (1.8m) 13s |
| Best Surf | 8PM (Mon 7th Sep) | 6ft (1.8m) 13s |
| Most Powerful | 11AM (Thu 10th Sep) | 8ft (2.4m) 15s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about what’s cooking for our local break, Onrus.
We’ve got a bit of a slow start, but the payoff is coming – a proper South-West groundswell is building. The first decent window is Monday morning, September 7th. The water is feeling way colder than normal for this time of year, so you’ll want a thick wetsuit.
Monday morning, September 7th, is our first real nod. Onrus is waking up with a solid 6ft SW groundswell, packing serious energy (1325). The wind is glassy, dead calm out of the WNW. It’s going to be clean, powerful, and lined up. This is an intermediate reef break, but at that size with a 14-second period, it’s going to be heavy. Not one for the beginners – leave it to the crew who know the reef. Crowds are sometimes around, so you might have a few mates out, but it’ll be worth it.
Swell drops back Tuesday, September 8th, through Wednesday, but the quality is shot with cross-shore winds. By Thursday morning, September 10th, a bigger pulse hits: 8ft SW at a long 15 seconds, with a huge energy jump (2590). But the catch is the onshore wind – it’s cloudy and messy, marginal at best.
The real standout, the session to circle on your calendar, is Wednesday afternoon, September 16th. Don’t let the morning rain fool you. By afternoon the wind goes glassy, and we’re looking at 8ft of SW swell with a very long 15-second period. The combined energy is massive (5546). This is exceptional, but it’s a big-wave day – expert territory only. That long period will focus perfectly on this reef. If you’ve got the skills, this is the session of the fortnight.
Before that, on Tuesday morning, September 15th, the offshore wind from the NW cleans up a 5ft SW swell. A solid, surfable morning. Then Tuesday afternoon the swell jumps to 10ft from the W with a short, fat 8-second period – too big and too short to hold shape here. That’s more of a kite session than a paddle one.
After the big Wednesday, it gets blown out with strong onshore winds through the end of the week. The following Sunday morning, September 20th, offers a last clean window with 7ft SW swell and glassy conditions – another good expert session, but the real magic is that Wednesday.
So to wrap it up: The best swell of the whole 16 days is Wednesday afternoon, September 16th. But jump on Monday morning, September 7th, for the first clean ride of the run. The second week is mostly a write-off with wind, so keep an eye on Tuesday 15th and Sunday 20th as backup clean-ups.
Rusty out.
Short Range ForecastMostly dry. Warm (max 25°C on Mon afternoon, min 14°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 10mm), heaviest on Thu night. Very mild (max 17°C on Thu morning, min 13°C on Fri morning). Winds increasing (light winds from the ESE on Thu morning, fresh winds from the ESE by Fri afternoon). | ||||||||||||||||||||
Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | |||||||||||||||
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 14 | SW 13 | WSW 13 | WSW 12 | WSW 11 | SW 11 | WSW 13 | WSW 13 | SW 12 | SW 15 | SW 14 | WSW 13 | WSW 12 | WSW 12 | WSW 12 | SW 14 | SW 16 | SW 15 | SW 14 | SW 13 | SW 13 |
Wave Graph | |||||||||||||||||||||
1288 | 1083 | 389 | 251 | 163 | 169 | 304 | 295 | 549 | 2590 | 2125 | 1198 | 822 | 658 | 472 | 1299 | 1871 | 1933 | 1262 | 933 | 732 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross | cross | glassy | glassy | cross-on | cross | cross-on | cross-on | on | on | on | on | cross-on | cross-on | cross-on | on | cross-on | cross-on | glassy | cross-off |
High Tide | 12:49PM1.30m | 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 | 7:05PM0.37m | 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 | ||||||||
6:54 | — | — | 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 | — | — | — | — | — | — | — | — | — | — | — | 1 | 2 | 2 | 2 | 1 | 1 | 1 | — | — | — |
Temp °C | 23 | 25 | 21 | 22 | 24 | 21 | 20 | 19 | 16 | 17 | 17 | 15 | 13 | 13 | 15 | 15 | 16 | 16 | 19 | 20 | 17 |
Feels °C | 22 | 24 | 19 | 23 | 24 | 21 | 20 | 18 | 16 | 16 | 14 | 13 | 8 | 7 | 12 | 11 | 13 | 13 | 20 | 20 | 18 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 13 | SSW 12 | WSW 12 | WSW 11 | SW 11 | WSW 13 | WSW 13 | SW 12 | SW 15 | SW 14 | WSW 13 | WSW 12 | WSW 12 | WSW 12 | SW 14 | SW 16 | SW 15 | SW 14 | SW 13 | SW 13 |
1288 | 1083 | 355 | 251 | 163 | 142 | 304 | 295 | 549 | 2590 | 2125 | 1198 | 822 | 658 | 472 | 1299 | 1871 | 1933 | 1262 | 933 | 732 | |
Swell 2 Height (m) Direction Period (s) | SE 8 | ESE 9 | WSW 13 | S 11 | S 10 | SW 14 | SSE 9 | SSE 8 | SW 18 | — | — | SW 8 | — | — | SSW 10 | — | S 7 | SSE 7 | SSE 8 | S 7 | WNW 6 |
18 | 7 | 389 | 188 | 94 | 169 | 16 | 23 | 194 | — | — | 77 | — | — | 97 | — | 66 | 82 | 94 | 39 | 22 | |
Swell 3 Height (m) Direction Period (s) | SSE 14 | — | SE 10 | SW 16 | SW 16 | SSE 9 | S 8 | SSE 10 | SSE 9 | — | — | — | — | — | — | — | — | SE 8 | SSE 12 | SE 12 | ESE 10 |
37 | — | 4 | 42 | 62 | 27 | 1 | 9 | 8 | — | — | — | — | — | — | — | — | 55 | 14 | 35 | 208 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | SE 10 | — | — | — | S 7 | SSE 7 | SSE 7 | SSE 6 | SE 7 | SE 8 | SE 9 | — | WNW 6 | — |
— | — | — | — | — | — | — | 33 | — | — | — | 214 | 277 | 204 | 100 | 213 | 211 | 749 | — | 67 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 32 | 4 | 0 | 0 | 4 | 32 | 4 | 4 | 23 | 272 | 95 | 221 | 335 | 4 | 86 | 40 | 10 | 4 | 0 | 8 |
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.










