Surf Forecasts:
Onrus surf forecast from 16 Sep 2026:
- Most powerful swell: Wednesday 16 Sep, 11PM (local time) - 8ft (2.5m), 13s period, SSW swell with 2,499 kJ wave energy.
Best Forecast Surf Conditions for Onrus this week:
The most powerful waves expected at Onrus in the next 16 days are 2.5m 13s and forecast to arrive on Wednesday (Sep 16) at 11PM. 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 5s period and expected on Tuesday (Sep 22) at 11PM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11PM (Wed 16th Sep) | 8ft (2.5m) 13s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Alright, let’s get into it. This is Onrus we’re talking about, and to be honest, the next week and a half is going to be a constant fight with the onshore breeze. The first run, from Wednesday the 16th through to the 21st, is going to be messy. We’ve got a solid southeast wind, 25 to 35 km/h, blowing straight on or cross-on shore for most of it. That’s going to tear up the 1.3m to 2.4m of swell that we have. It’s going to be lumpy, choppy, and pretty uninviting. The energy in the water is there, but it just won't be clean. The water temp is around 58° F, which is a bit chilly for this time of year, so a good 4/3 is a must.
The middle part sees a bit of a dip in size on the 22nd, but it’s still just cross-on with light winds. Not worth the paddle for the 0.9m – 1.0m slop on offer.
The big moment, and honestly the only time this whole forecast looks like it’s going to work, is on Wednesday the 24th and Thursday the 25th. The wind finally switches to the west, a proper cross-off for Onrus, and the swell is huge – we’re looking at a solid 8 to 11 feet on the face. The period is long, 14 to 15 seconds, and the energy is off the charts. But here’s the thing: it’s too big. This break just can’t handle that much water. It's going to be a clean, powerful mess. The forecast literally says the swell is too big, so while it looks incredible from the shore, only the most experienced paddlers would even consider it. The wave height is over the 2.5m mark, firmly in the "experts only" territory.
By the 28th things start to settle down. We get a smaller, cleaner day with 1.5m – 1.8m waves and light winds. That’s your best bet for actually getting some clean ones in, a bit of relief after all that wind and before the ocean decides to take a breather.
So, bottom line: it’s a long wait for the surf to get good. The big 24th and 25th will be a spectacle, but it’s a no-go unless you're in the top tier. The 28th looks like the pick of the rest, but you’ll need to be on it early.
Rusty.
Short Range ForecastSome drizzle, heaviest during Wed morning. Very mild (max 17°C on Fri morning, min 12°C on Wed night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Sat night. Warm (max 22°C on Mon afternoon, min 15°C on Sat morning). Mainly fresh winds. | ||||||||||||||||||||
Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | |||||||||||||||
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 12 | SW 13 | SSW 13 | SSW 12 | SW 12 | SW 11 | SW 11 | SW 13 | SW 12 | SW 12 | SW 12 | SW 14 | SW 13 | WSW 13 | WSW 12 | WSW 12 | SW 12 | SW 11 | SW 13 | SW 12 | SW 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1706 | 1756 | 2329 | 1580 | 1149 | 866 | 696 | 940 | 773 | 494 | 355 | 1527 | 1164 | 904 | 702 | 480 | 407 | 242 | 245 | 268 | 277 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 5:59PM1.31m | 6:20AM1.17m | 6:32PM1.17m | 7:03AM1.04m | 7:21PM1.04m | 8:35AM0.94m | 9:27PM0.96m | 11:23AM0.98m | 11:40PM1.02m | 12:29PM1.10m | 00:36AM1.13m | 1:05PM1.24m | 1:13AM1.25m | ||||||||
Low Tide | 11:46AM0.40m | 00:13AM0.43m | 12:16PM0.52m | 00:49AM0.55m | 12:56PM0.65m | 1:53AM0.67m | 2:37PM0.76m | 4:44AM0.69m | 5:48PM0.72m | 6:14AM0.59m | 6:45PM0.59m | 6:54AM0.47m | 7:19PM0.46m | ||||||||
 |  |  | | | | | | | | |  | |  | | |  | | | |  | |
 | 6:41 | — | — | 6:39 | — | — | 6:39 | — | — | 6:37 | — | — | 6:35 | — | — | 6:35 | — | — | 6:33 | — | — |
 | — | 6:35 | — | — | 6:35 | — | — | 6:36 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:38 | — |
mm | 1 | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 1 | 1 | — | — | — | — | — | — |
Temp °C | 15 | 15 | 13 | 16 | 16 | 13 | 17 | 17 | 15 | 17 | 18 | 16 | 16 | 16 | 16 | 20 | 22 | 17 | 22 | 24 | 22 |
Feels °C | 9 | 8 | 7 | 8 | 8 | 7 | 9 | 9 | 9 | 11 | 12 | 11 | 12 | 13 | 13 | 17 | 19 | 14 | 22 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | SW 12 | SW 13 | SSW 13 | SSW 12 | SW 12 | SW 11 | SW 11 | SW 13 | SW 12 | SW 12 | SW 12 | SW 14 | SW 13 | WSW 13 | WSW 12 | WSW 12 | SW 12 | SW 11 | SW 13 | SW 12 | SW 10 |
| kJ | 1706 | 1756 | 2329 | 1580 | 1149 | 866 | 696 | 940 | 773 | 494 | 355 | 1527 | 1164 | 904 | 702 | 480 | 407 | 242 | 245 | 268 | 277 |
Swell 2 Height (m) Direction Period (s) | SW 14 | SW 13 | W 13 | — | E 10 | E 11 | — | — | SW 16 | SW 14 | SW 15 | — | — | — | — | E 10 | SW 15 | SW 14 | WSW 11 | WSW 11 | ESE 9 |
| kJ | 605 | 495 | 339 | — | 8 | 2 | — | — | 91 | 214 | 255 | — | — | — | — | 2 | 56 | 97 | 135 | 88 | 8 |
Swell 3 Height (m) Direction Period (s) | ESE 11 | — | — | — | — | — | — | — | — | — | SW 18 | — | — | — | — | — | — | E 10 | SE 7 | SE 8 | — |
| kJ | 24 | — | — | — | — | — | — | — | — | — | 82 | — | — | — | — | — | — | 2 | 13 | 10 | — |
Wind waves Height (m) Direction Period (s) | — | SE 5 | SE 6 | E 11 | SE 5 | ESE 4 | ESE 4 | SE 5 | ESE 4 | SE 5 | SE 5 | SSE 5 | SE 5 | SSE 5 | SSE 5 | SE 4 | SE 5 | E 5 | — | W 3 | W 5 |
| kJ | — | 56 | 278 | 9 | 42 | 15 | 38 | 84 | 32 | 45 | 77 | 45 | 38 | 41 | 22 | 20 | 31 | 19 | — | 7 | 88 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 272 | 245 | 40 | 335 | 1373 | 4 | 86 | 1954 | 92 | 101 | 245 | 270 | 95 | 335 | 10 | 23 | 86 | 23 | 4 | 4 | 4 |
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.
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