
Surf Forecasts:
Onrus surf forecast from 9 Aug 2026:
- Best quality surf: Monday 10 Aug, 5AM (local time) - 10ft (3.0m), 11s period, SSW swell with onshore winds.
- Most powerful swell: Thursday 13 Aug, 11AM (local time) - 7.5ft (2.3m), 18s period, SW swell with 3,304 kJ wave energy.
- Next surfable swell (1★+): Monday 10 Aug, 5AM (local time) - 10ft (3.0m), 11s period with SSW 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 (Aug 10) at 5AM. The primary swell is predicted to be 3.0m and 11s period with a secondary swell of 2.5m and 11s. The wind is predicted to be onshore as the swell arrives.
The most powerful waves expected at Onrus in the next 16 days are 2.3m 18s and forecast to arrive on Thursday (Aug 13) at 11AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 7s period and expected on Tuesday (Aug 11) at 11AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Mon 10th Aug) | 10ft (3.0m) 11s |
| Best Surf | 5AM (Mon 10th Aug) | 10ft (3.0m) 11s |
| Most Powerful | 11AM (Thu 13th Aug) | 7.5ft (2.3m) 18s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Alright, let’s get into it. The surf’s been a bit of a mess lately, but there are a few windows where it’s worth getting wet. We’ve got a long stretch ahead, so let’s break it down day by day.
The first few days are pretty much a write-off. Sunday the 9th is seeing a solid 12ft of SSW swell, but a 22 mph south wind is blowing straight across it, making it lumpy and borderline unrideable. The energy is strong (6075), but it’s all over the place. Monday and Tuesday aren't much better, with onshore winds and dropping swell. The period is decent, but the wind just kills it. You’re looking at a rough, choppy ocean and not much to get excited about. I’d say give it a miss until midweek.
Things start to settle down on Wednesday the 12th. The swell drops to a more manageable 6ft, and the wind turns light and cross-shore. It’s still a bit lumpy, but you can start to see some shape in the water. The period jumps to 18 seconds, so there’s some proper groundswell energy moving through, but it’s still not clean enough to call it good. This is a “keep an eye on it” type of day.
Now, here’s where it gets interesting. Thursday the 13th sees the swell bump back up to 8ft with that long 18-second period, and the wind is light and cross-shore again. The energy is moderate (3304), but it’s still a bit bumpy. The real gem is Friday afternoon the 14th through Saturday afternoon the 15th. The wind drops right off, turning glassy, and the swell settles into a clean 6ft from the WSW with a 14-second period. This is the cleanest surf we’ve seen in days. The energy is moderate (around 1000-1142), but the quality is there. For an exposed reef like Onrus, this is when it’s going to be firing. The water temp is 59°F, which is about normal for this time of year, so don’t forget the booties.
Sunday the 16th is still decent, but the swell backs off a touch. The morning looks clean with a light cross-offshore wind and 4ft waves. The afternoon is okay, but a light cross-onshore breeze starts to crinkle the surface. It’s still rideable, but not as perfect as the day before.
Now, here’s the big one. Monday the 17th. The forecast is calling for a 10ft SW swell with a 15-second period. The wind is light and cross-onshore in the morning, but it goes glassy by the afternoon. The energy is strong (3904). This is a serious amount of water moving. For the experienced crew, this could be the standout of the period. But, and this is a big but, this is a lot of water for Onrus. It’s going to be pushing the limits, and it’s only for experts. The afternoon cleans up to 8ft, which is still big and powerful. This is a day for the brave.
After that, Tuesday the 18th sees a big drop back down to 5ft with a moderate cross-offshore wind. It’s clean, but smaller and less powerful. The long-range stuff from the 19th onwards looks poor, with fresh onshore winds and messy conditions. The swell sticks around at 3-5ft, but the wind is just ruining it. There’s a brief moment on Saturday the 22nd with light winds and a small 4ft SW swell, but it’s not much to write home about.
Looking further out, Sunday the 23rd and Monday the 24th bring another pulse of 8-8ft SW swell, but the winds are onshore and the conditions look marginal. The energy is moderate (2686-3026), but it won't be clean.
So, to sum it up: the standout days are Friday afternoon the 14th through Saturday afternoon the 15th for the cleanest, most user-friendly waves. And for the experts, Monday afternoon the 17th is the big, powerful one, but it’s not for the faint of heart. The rest of the window is a mixed bag of wind and chop, with a few better windows in between.
Rusty.
Short Range ForecastSome drizzle, heaviest during Sun night. Very mild (max 15°C on Tue afternoon, min 9°C on Tue night). Winds decreasing (fresh winds from the E on Tue night, light winds from the NE by Wed morning). | Days 5-7 Weather SummaryMostly dry. Warm (max 25°C on Fri afternoon, min 16°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sun 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | ||||||||||||||
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 | SSW 11 | SSW 11 | S 10 | SSW 13 | S 12 | S 12 | SW 22 | SW 18 | SW 18 | SW 16 | SW 18 | SW 17 | SW 16 | WSW 15 | WSW 14 | WSW 14 | WSW 14 | WSW 13 | WSW 13 |
Wave Graph | ||||||||||||||||||||
3181 | 1921 | 1410 | 1299 | 2116 | 1249 | 959 | 1641 | 1946 | 1880 | 2003 | 3304 | 2813 | 1672 | 1014 | 1142 | 943 | 1008 | 965 | 817 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross | cross | cross | cross | cross-off | glassy | cross-off | glassy | glassy | cross-off |
High Tide | 1:08AM1.39m | 1:47PM1.41m | 2:02AM1.50m | 2:34PM1.55m | 2:49AM1.57m | 3:16PM1.67m | 3:31AM1.61m | 3:54PM1.73m | 4:09AM1.60m | 4:31PM1.74m | 4:46AM1.55m | 5:06PM1.69m | ||||||||
Low Tide | 6:59PM0.41m | 7:35AM0.23m | 7:58PM0.27m | 8:23AM0.12m | 8:47PM0.15m | 9:04AM0.04m | 9:30PM0.07m | 9:42AM-0.00m | 10:10PM0.04m | 10:18AM0.00m | 10:47PM0.05m | 10:52AM0.06m | 11:23PM0.12m | |||||||
— | — | 7:28 | — | — | 7:26 | — | — | 7:26 | — | — | 7:24 | — | — | 7:24 | — | — | 7:22 | — | — | |
6:07 | — | — | 6:07 | — | — | 6:08 | — | — | 6:09 | — | — | 6:10 | — | — | 6:10 | — | — | 6:12 | — | |
mm | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 12 | 12 | 13 | 12 | 13 | 15 | 12 | 14 | 20 | 17 | 21 | 24 | 21 | 23 | 25 | 20 | 21 | 21 | 17 |
Feels °C | 4 | 6 | 7 | 6 | 6 | 5 | 8 | 4 | 10 | 16 | 13 | 17 | 21 | 18 | 20 | 24 | 19 | 20 | 19 | 17 |
Swell 1 Height (m) Direction Period (s) | SW 12 | SSW 11 | SSW 11 | S 10 | SSW 13 | S 12 | SW 24 | SW 22 | SW 18 | SW 18 | SW 16 | SW 18 | SW 17 | SW 16 | WSW 15 | WSW 14 | WSW 14 | WSW 14 | WSW 13 | WSW 13 |
2894 | 1921 | 1410 | 830 | 2116 | 1249 | 287 | 1641 | 1946 | 1880 | 2003 | 3304 | 2813 | 1672 | 1014 | 1142 | 943 | 1008 | 965 | 817 | |
Swell 2 Height (m) Direction Period (s) | E 9 | — | — | SW 11 | WSW 11 | SW 26 | WSW 10 | SSW 11 | SW 10 | SW 10 | SW 22 | ESE 9 | ESE 9 | ESE 9 | SE 11 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 |
2 | — | — | 347 | 103 | 27 | 10 | 247 | 132 | 65 | 457 | 307 | 237 | 68 | 40 | 168 | 92 | 61 | 69 | 50 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | SSW 14 | — | W 16 | S 10 | — | SE 8 | S 10 | S 10 | — | — | — | — | — | — | ESE 10 | — | — |
— | — | — | 529 | — | 5 | 18 | — | 34 | 17 | 7 | — | — | — | — | — | — | 10 | — | — | |
Wind waves Height (m) Direction Period (s) | SSW 12 | SSE 8 | S 9 | S 10 | E 3 | ESE 7 | S 12 | ESE 8 | ENE 3 | ESE 8 | ESE 9 | E 10 | ESE 10 | ESE 9 | — | — | — | — | — | — |
3181 | 331 | 747 | 1299 | 6 | 395 | 959 | 181 | 9 | 43 | 69 | 51 | 111 | 276 | — | — | — | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1371 | 247 | 270 | 221 | 23 | 38 | 34 | 23 | 10 | 10 | 10 | 10 | 10 | 10 | 0 | 0 | 0 | 0 | 0 | 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.











