Surf Forecasts:
Onrus surf forecast from 25 Aug 2026:
- Best quality surf: Thursday 27 Aug, 8AM (local time) - 5ft (1.5m), 12s period, S swell with offshore winds.
- Most powerful swell: Tuesday 25 Aug, 2PM (local time) - 8ft (2.4m), 14s period, SW swell with 2,326 kJ wave energy.
- Next surfable swell (1★+): Thursday 27 Aug, 5AM (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 5AM. 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 2PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Wednesday (Aug 26) at 8AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Thu 27th Aug) | 5ft (1.5m) 12s |
| Best Surf | 8AM (Thu 27th Aug) | 5ft (1.5m) 12s |
| Most Powerful | 2PM (Tue 25th Aug) | 8ft (2.4m) 14s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Alright, Rusty here. Let's have a look at what's on the table for Onrus.
Right off the bat, the first few days are a write-off. Tuesday the 25th and Wednesday the 26th have some solid swell, but with a cross-onshore breeze messing things up, it’s all chop and no good. The water is sitting at 59°, which is pretty much normal for this time of year, so no surprises there.
Thursday the 27th is where it starts to get interesting. We’ve got clean conditions with a light cross-offshore breeze. The swell is around 5 ft from the S with a 12-second period. The combined energy is moderate (821), and the report says expect very good surf. It’s an inconsistent reef break, so be patient, and crowds are possible. This is your best bet for the first week.
Friday the 28th morning is a bit marginal, but the afternoon turns glassy with a 3 ft WSW swell at 14 seconds. The energy is low (511), so it’ll be small but clean. Saturday the 29th and Sunday the 30th stay clean but marginal, with a moderate breeze keeping things a bit bumpy.
Now, looking ahead to Monday the 1st of September – hold onto your board. Tuesday afternoon the 1st of September is a standout. We’ve got a 10 ft SW swell with a 14-second period and clean offshore winds. The combined energy is massive (3508). This is expert-only territory, as it’s way too big for beginners. The wave quality is expected to be excellent, but the sheer size means only the most experienced crew should be out there. The next few days (2nd to 4th of September) are all similar – huge swell, over 8 ft, and clean winds, but the same caveat applies: this is big wave stuff.
After that, from the 5th of September onward, the wind turns bad again and the swell drops, so the window of opportunity is pretty narrow. The 6th of September has some light onshore winds, but it’s a marginal call.
So, to wrap it up: the clear winner is Thursday the 27th of August for a clean, solid session, but the real thrill-seekers should eye up Tuesday the 1st of September for a proper barrel.
Rusty.
Short Range ForecastMostly dry. Warm (max 22°C on Thu morning, min 11°C on Tue morning). Winds decreasing (fresh winds from the E on Tue night, calm by Thu night). | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Sat night. Very mild (max 19°C on Fri afternoon, min 10°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | |||||||||||||||
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 14 | SW 13 | WSW 13 | SSW 16 | S 11 | S 12 | SSW 11 | S 11 | S 11 | WSW 14 | WSW 13 | WSW 13 | WSW 14 | WSW 13 | WSW 13 | SW 12 | SW 11 | SW 11 | SW 11 | WSW 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2358 | 1637 | 1144 | 512 | 392 | 596 | 628 | 513 | 410 | 279 | 239 | 402 | 421 | 826 | 545 | 512 | 1472 | 1047 | 780 | 716 | 352 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-off | cross-off | glassy | cross-on | glassy | glassy | cross-off | cross-off | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-off |
High Tide | 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 | 4:32PM1.68m | 4:48AM1.52m | 5:04PM1.65m | ||||||||
Low Tide | 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 | 10:19AM0.07m | 10:46PM0.09m | 10:49AM0.11m | 11:19PM0.13m | |||||||
 | |  |  | | | | |  | | |  |  | |  |  | | | | | | |
 | 7:11 | — | — | 7:09 | — | — | 7:09 | — | — | 7:07 | — | — | 7:05 | — | — | 7:05 | — | — | 7:03 | — | — |
 | — | 6:19 | — | — | 6:20 | — | — | 6:21 | — | — | 6:21 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 6 | 2 | — | — | — | — | — |
Temp °C | 14 | 18 | 14 | 15 | 21 | 19 | 22 | 21 | 16 | 18 | 19 | 16 | 17 | 18 | 16 | 14 | 14 | 13 | 13 | 15 | 11 |
Feels °C | 9 | 13 | 9 | 9 | 18 | 17 | 20 | 18 | 16 | 17 | 18 | 15 | 13 | 13 | 13 | 11 | 10 | 9 | 11 | 11 | 9 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 14 | SW 13 | WSW 13 | SSW 11 | S 11 | S 12 | SSW 11 | S 11 | S 11 | S 10 | WSW 13 | WSW 13 | WSW 14 | WSW 13 | WSW 8 | SW 12 | SW 11 | SW 11 | SW 11 | WSW 11 |
| kJ | 2358 | 1637 | 1144 | 512 | 383 | 596 | 628 | 513 | 410 | 279 | 210 | 402 | 421 | 826 | 545 | 374 | 1472 | 1047 | 780 | 716 | 352 |
Swell 2 Height (m) Direction Period (s) | SW 16 | SSW 15 | SSW 16 | SSW 11 | WSW 12 | WSW 12 | WSW 12 | WSW 11 | WSW 11 | WSW 11 | WSW 14 | S 10 | S 11 | S 11 | SSE 11 | WSW 13 | SSE 10 | SSE 10 | SE 9 | — | SSW 10 |
| kJ | 248 | 144 | 104 | 273 | 309 | 167 | 193 | 145 | 95 | 91 | 239 | 128 | 151 | 89 | 39 | 512 | 10 | 9 | 3 | — | 140 |
Swell 3 Height (m) Direction Period (s) | — | — | S 6 | SSW 16 | SSW 16 | SSW 15 | SE 8 | WSW 16 | WSW 15 | WSW 14 | WSW 10 | S 13 | WSW 16 | ESE 8 | E 12 | SSE 10 | E 12 | E 12 | — | — | E 12 |
| kJ | — | — | 84 | 366 | 392 | 146 | 162 | 26 | 87 | 123 | 62 | 115 | 51 | 14 | 11 | 11 | 12 | 3 | — | — | 3 |
Wind waves Height (m) Direction Period (s) | — | SE 3 | SE 6 | E 4 | ESE 7 | — | — | W 4 | — | — | — | — | W 3 | WSW 5 | WSW 8 | — | — | — | — | — | — |
| kJ | — | 9 | 118 | 45 | 107 | — | — | 7 | — | — | — | — | 8 | 37 | 433 | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 23 | 40 | 45 | 38 | 4 | 4 | 0 | 0 | 0 | 4 | 0 | 0 | 50 | 31 | 4 | 23 | 23 | 10 | 4 | 4 | 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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