Surf Forecasts:
Onrus surf forecast from 24 Aug 2026:
- Best quality surf: Sunday 30 Aug, 8PM (local time) - 8ft (2.4m), 13s period, WSW swell with offshore winds.
- Most powerful swell: Tuesday 25 Aug, 11AM (local time) - 8ft (2.4m), 14s period, SW swell with 2,358 kJ wave energy.
- Next surfable swell (1★+): Thursday 27 Aug, 8AM (local time) - 5ft (1.5m), 12s period with S 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 Thursday (Aug 27) at 8AM. The primary swell is predicted to be 1.5m and 12s period with a secondary swell of 0.8m and 12s. 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 2.4m 14s and forecast to arrive on Tuesday (Aug 25) at 11AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 6s period and expected on Sunday (Aug 30) at 5AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Thu 27th Aug) | 5ft (1.5m) 12s |
| Best Surf | 8PM (Sun 30th Aug) | 8ft (2.4m) 13s |
| Most Powerful | 11AM (Tue 25th Aug) | 8ft (2.4m) 14s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Alright, surfers, Rusty here. Let's have a look at what's cooking for the next couple of weeks at Onrus. It’s a reef set-up that's inconsistent, so we’re not in for a non-stop party, but when it lines up, it can be a real treat.
We're looking at a classic story here: a bit of a rough start, then a sweet window of clean conditions, followed by some powerful but tricky swells that might be a bit too much of a good thing, before settling back down.
The first real chance to wet a line comes on Thursday the 27th of August. The early part of the week is messy with strong winds and choppy conditions, so just give that a miss. Thursday morning serves up a clean 5ft SSW swell with light, offshore-styled winds. The wave energy is moderate (831), and with the wind as it is, the surface will be clean. That afternoon stays clean too, with a similar sized S swell, making it a solid day for a paddle.
Friday the 28th sees the wind shift onshore, messing things up again, so that’s a no-go. There’s a bit of hope for Saturday the 29th with a clean but short-period 8ft W swell. The period is only 6 seconds, so it'll be a bit crumbly and soft, but clean.
Now, mark your calendars. The real standout is Tuesday the 1st of September. The morning looks absolutely perfect: glassy conditions, calm winds, and a clean 7ft SW groundswell (period of 11 seconds). The wave energy is moderate (1118), and with zero wind, it’s going to be a dream out there. The afternoon stays clean with a cross-shore breeze and a slightly bigger 8ft SW swell. This is the pick of the fortnight.
The following days get heavy. Wednesday the 2nd and Thursday the 3rd of September see a massive pulse of energy. We're talking 12ft to 15ft swells with wave energy readings over 4000 and 5000. The forecast actually says it’s too big for this break, and honestly, for a reef like Onrus, that’s only for the expert crew. The wind is also howling, so it’s a hard pass.
We get a nice recovery on Friday the 4th of September with clean, manageable 7ft S swell for the morning and 6ft in the afternoon. Great conditions for those who didn't get out on Tuesday.
The weekend of the 5th and 6th of September has another burst of size, with 10ft swells, but again, the guidance says it’s too much for this spot. Only for the brave or the foolish.
The final days from the 7th of September calm down with smaller, cleaner swells around 5ft to 6ft, but the wind starts getting a bit cross-onshore again by the 8th, so the window is closing.
Bottom line: Tuesday the 1st of September is your day. Glassy, solid 7ft swell, and clean as a whistle. Get on it.
- Rusty
Short Range ForecastMostly dry. Very mild (max 18°C on Tue afternoon, min 10°C on Mon night). Winds increasing (light winds from the ESE on Sun night, strong winds from the E by Wed morning). | Days 5-7 Weather SummaryMostly dry. Warm (max 29°C on Fri afternoon, min 13°C on Wed night). Winds increasing (calm on Thu night, fresh winds from the W by Sat afternoon). | ||||||||||||||||||
Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | ||||||||||||||
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 12 | WSW 11 | SSW 11 | SW 14 | SW 14 | SW 14 | SW 13 | WSW 13 | SSW 16 | S 11 | SSW 11 | S 11 | S 11 | S 11 | WSW 14 | WSW 13 | WSW 13 | W 6 | WSW 13 |
Wave Graph  | |||||||||||||||||||
 kJ | 988 | 706 | 425 | 2082 | 2358 | 1830 | 1417 | 512 | 392 | 563 | 522 | 492 | 410 | 332 | 243 | 253 | 408 | 434 | 624 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross | cross-off | cross-off | glassy | cross-on | cross-on | off | cross-off | cross-off | off |
High Tide | 1:04AM1.17m | 1:39PM1.22m | 1:42AM1.27m | 2:10PM1.34m | 2:15AM1.37m | 2:38PM1.46m | 2:45AM1.46m | 3:06PM1.56m | 3:15AM1.52m | 3:34PM1.64m | 3:45AM1.55m | 4:02PM1.68m | 4:16AM1.55m | ||||||
Low Tide | 7:30AM0.44m | 7:48PM0.48m | 8:02AM0.33m | 8:19PM0.37m | 8:29AM0.23m | 8:48PM0.27m | 8:56AM0.15m | 9:17PM0.18m | 9:23AM0.10m | 9:46PM0.12m | 9:50AM0.07m | 10:15PM0.09m | |||||||
 |  | | | | |  |  | | | | | | | | | | |  | |
 | — | 7:13 | — | — | 7:11 | — | — | 7:09 | — | — | 7:09 | — | — | 7:07 | — | — | 7:05 | — | — |
 | 6:17 | — | 6:17 | — | — | 6:19 | — | — | 6:20 | — | — | 6:21 | — | — | 6:21 | — | — | 6:22 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 |
Temp °C | 12 | 14 | 16 | 12 | 14 | 18 | 13 | 16 | 18 | 16 | 21 | 23 | 17 | 23 | 29 | 25 | 20 | 20 | 16 |
Feels °C | 11 | 12 | 13 | 10 | 10 | 13 | 9 | 9 | 11 | 14 | 19 | 20 | 15 | 19 | 26 | 22 | 16 | 15 | 13 |
Swell 1 Height (m) Direction Period (s) | WSW 12 | WSW 11 | SSW 11 | SW 14 | SW 14 | SW 14 | SW 13 | WSW 13 | WSW 12 | S 11 | SSW 11 | S 11 | S 11 | S 11 | S 11 | WSW 13 | WSW 13 | S 11 | WSW 13 |
| kJ | 988 | 706 | 425 | 2082 | 2358 | 1830 | 1417 | 512 | 390 | 563 | 522 | 492 | 410 | 332 | 223 | 253 | 408 | 86 | 624 |
Swell 2 Height (m) Direction Period (s) | — | SSW 14 | WSW 11 | W 11 | SW 16 | SSW 15 | SW 16 | SSW 11 | SSW 12 | WSW 12 | WSW 12 | WSW 11 | WSW 11 | WSW 11 | WSW 14 | S 10 | S 11 | ESE 8 | SSE 10 |
| kJ | — | 76 | 387 | 63 | 251 | 144 | 67 | 243 | 237 | 167 | 153 | 145 | 95 | 91 | 243 | 128 | 157 | 12 | 36 |
Swell 3 Height (m) Direction Period (s) | — | — | SW 15 | — | — | — | SSW 16 | SSW 16 | SSW 16 | SSW 15 | WSW 12 | W 4 | SW 15 | WSW 14 | WSW 11 | S 13 | WSW 18 | — | ESE 9 |
| kJ | — | — | 309 | — | — | — | 87 | 223 | 392 | 123 | 156 | 1 | 57 | 73 | 66 | 121 | 31 | — | 7 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | E 3 | SE 7 | SE 7 | ENE 3 | — | WNW 4 | — | — | SE 4 | — | WNW 5 | W 6 | W 6 |
| kJ | — | — | — | — | — | — | 8 | 183 | 211 | 5 | — | 5 | — | — | 16 | — | 56 | 434 | 103 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 10 | 4 | 23 | 10 | 23 | 335 | 45 | 45 | 38 | 10 | 0 | 0 | 0 | 4 | 4 | 0 | 31 | 72 | 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.
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