Surf Forecasts:
Onrus surf forecast from 16 Aug 2026:
- Best quality surf: Monday 17 Aug, 2AM (local time) - 10ft (3.0m), 14s period, WSW swell with cross-offshore winds.
- Most powerful swell: Monday 17 Aug, 2AM (local time) - 10ft (3.0m), 14s period, WSW swell with 2,830 kJ wave energy.
- Next surfable swell (1★+): Sunday 16 Aug, 8AM (local time) - 5.5ft (1.7m), 13s period with WSW 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 Sunday (Aug 16) at 8AM. The primary swell is predicted to be 1.7m and 13s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Onrus in the next 16 days are 3.0m 14s and forecast to arrive on Monday (Aug 17) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Sunday (Aug 16) at 5PM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Sun 16th Aug) | 5.5ft (1.7m) 13s |
| Best Surf | 2AM (Mon 17th Aug) | 10ft (3.0m) 14s |
| Most Powerful | 2AM (Mon 17th Aug) | 10ft (3.0m) 14s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Alright, this is Rusty. I’m looking at Onrus for the next couple of weeks. The water temp is sitting at 57°, a couple degrees cooler than usual, so you'll want a good suit.
We’ve got action right from Sunday the 16th. Onrus is a reef that loves a SW swell, and early that morning we’ve got 6 feet of swell with a 13-second period and offshore wind. The combined energy is 1190, so there’s some real grunt in the water, but it’s clean and the longer period will bring good shaped waves that make the paddle out not too bad. This is the session to aim for early. Monday the 17th morning is even bigger—8 feet with offshore wind and an energy of 2084—excellent for the crew that can handle it. Tuesday the 18th gets messy with onshore wind, but Wednesday the 19th morning is a glassy 8-foot SW swell—a beautiful, clean window.
The quality takes a hit from Thursday the 20th through the weekend. We’ve got onshore winds chewing up the swell. The waves stay solid, but the conditions get grotty. Saturday the 22nd morning has a strong 22 mph offshore wind, which is a bit wild. The worst of it hits Sunday the 23rd with a massive 10-foot, 16-second period swell and onshore wind—total chaos, way better for kiting. The energy skyrockets to 5195, but the surface is a mess.
If you can hold out, next week has some gems. Tuesday the 25th morning is dead glassy with 6 feet of SSW swell and 1408 energy—clean and manageable. But the one I’m most excited about, and I mean it, is Wednesday the 26th morning. You get an 8-foot SW groundswell with a 16-second period, absolutely flat calm, glassy conditions, and a huge 3628 combined energy. That’s a heavy, long-period reef swell. It’s going to be powerful and perfect, but it’s for the experienced guys only. Too much power for beginners. The days following, the 27th and 28th, keep the offshore wind and solid waves, but nothing tops that Wednesday glass-off.
Then from the 30th it blows out again. Sunday the 30th has a 13-foot monster at 7595 energy—simply too big for the spot. And the last day, the 31st, has onshore wind ruining a 10-foot swell. Catch the early windows, and lock in Wednesday the 26th.
Rusty.
Short Range ForecastMostly dry. Very mild (max 19°C on Sun afternoon, min 12°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 16°C on Wed afternoon, min 10°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 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) | WSW 13 | WSW 14 | WSW 14 | WSW 13 | WSW 13 | WSW 13 | SW 12 | SW 13 | SW 12 | SW 12 | SW 12 | SW 12 | SW 12 | SW 13 | SW 12 | SW 11 | SW 11 | SW 10 | SW 11 | SW 13 | SW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1190 | 1525 | 2830 | 2084 | 1930 | 1575 | 1572 | 2213 | 1897 | 1539 | 1358 | 1292 | 2044 | 2272 | 1710 | 1004 | 729 | 478 | 866 | 1697 | 1846 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross-off | off | cross-off | cross-off | on | on | cross-on | glassy | cross | glassy | cross-on | on | cross-on | cross | cross-off | off | off | cross-off | cross-on |
High Tide | 5:39PM1.60m | 5:55AM1.37m | 6:12PM1.47m | 6:30AM1.25m | 6:46PM1.33m | 7:08AM1.13m | 7:25PM1.19m | 7:59AM1.02m | 8:25PM1.07m | 9:40AM0.94m | 10:21PM1.01m | 11:56AM0.98m | 00:08AM1.06m | ||||||||
Low Tide | 11:25AM0.15m | 11:57PM0.21m | 11:56AM0.26m | 00:31AM0.33m | 12:28PM0.39m | 1:06AM0.45m | 1:02PM0.53m | 1:50AM0.57m | 1:50PM0.65m | 3:11AM0.66m | 3:39PM0.74m | 5:33AM0.65m | 6:08PM0.70m | ||||||||
 | |  |  | |  | | | | | | | | | | | | | | |  | |
 | 7:22 | — | — | 7:20 | — | — | 7:20 | — | — | 7:18 | — | — | 7:16 | — | — | 7:16 | — | — | 7:15 | — | — |
 | — | 6:13 | — | — | 6:13 | — | — | 6:14 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 |
Temp °C | 17 | 19 | 16 | 18 | 19 | 16 | 15 | 16 | 14 | 15 | 16 | 13 | 14 | 16 | 13 | 15 | 15 | 14 | 16 | 15 | 14 |
Feels °C | 14 | 14 | 13 | 17 | 17 | 15 | 14 | 14 | 11 | 15 | 14 | 13 | 12 | 12 | 9 | 14 | 13 | 10 | 9 | 9 | 11 |
Swell 1 Height (m) Direction Period (s) | WSW 13 | WSW 14 | WSW 14 | WSW 13 | WSW 13 | WSW 13 | SW 12 | SW 13 | SW 12 | SW 12 | SW 12 | SW 12 | SW 12 | SW 13 | SW 12 | SW 11 | SW 11 | SW 10 | SW 11 | SW 13 | SW 13 |
| kJ | 1190 | 1525 | 2830 | 2084 | 1930 | 1575 | 1572 | 2213 | 1897 | 1539 | 1358 | 1292 | 2044 | 2272 | 1710 | 1004 | 729 | 478 | 866 | 1697 | 1846 |
Swell 2 Height (m) Direction Period (s) | ESE 9 | E 12 | — | ESE 11 | E 10 | SW 14 | SW 12 | W 12 | E 10 | E 10 | E 10 | E 10 | — | — | — | — | — | — | — | — | — |
| kJ | 16 | 11 | — | 22 | 17 | 453 | 888 | 75 | 8 | 2 | 2 | 2 | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | E 10 | — | — | — | — | E 11 | E 11 | E 11 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 2 | — | — | — | — | 9 | 9 | 9 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WNW 4 | W 5 | — | — | — | — | — | — | — | — | — | — | — | — | E 3 | — | — | — | — | — | — |
| kJ | 25 | 46 | — | — | — | — | — | — | — | — | — | — | — | — | 8 | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 50 | 10 | 0 | 0 | 0 | 4 | 83 | 10 | 0 | 32 | 0 | 10 | 335 | 10 | 23 | 0 | 0 | 60 | 66 | 83 |
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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