Surf Forecasts:
Onrus surf forecast from 3 Sep 2026:
- Best quality surf: Monday 7 Sep, 8AM (local time) - 6ft (1.8m), 14s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 6 Sep, 11AM (local time) - 8ft (2.5m), 18s period, SSW swell with 4,473 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 8AM (local time) - 6ft (1.8m), 14s period with SW 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 (Sep 07) at 8AM. The primary swell is predicted to be 1.8m and 14s period with a secondary swell of 0.6m and 9s. 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 2.5m 18s and forecast to arrive on Sunday (Sep 06) 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 2.3m 7s period and expected on Sunday (Sep 06) at 11AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Mon 7th Sep) | 6ft (1.8m) 14s |
| Best Surf | 8AM (Mon 7th Sep) | 6ft (1.8m) 14s |
| Most Powerful | 11AM (Sun 6th Sep) | 8ft (2.5m) 18s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Alright, Rusty here again, putting it in feet and Fahrenheit for the crew across the pond.
Let's break down what Onrus has in store. The first few days are pretty blown out with onshore wind and junk, but stick with me. The good stuff is shaping up to start on Monday, September 7th.
Your standout day is Monday the 7th of September. We're looking at a quality SW groundswell pushing in at about 5 to 6 feet with a long 13 to 14 second period. That's serious energy, around 1351 combined. The water is around 59°, which is normal for the season. The real winner is the wind: light offshore from the west in the morning, going to dead glassy calm in the afternoon. That means clean, groomed lines over this reef break. It's an intermediate wave, so it's got some push but the shape should be there. It's inconsistent, and crowds are a possibility, so pick your moment.
Tuesday the 8th is a quieter but still solid option, especially the afternoon. The swell drops to about 3 feet from the SSW with an 11 second period and 505 combined energy, but the wind goes glassy again. Perfect for a log or a fun board.
Things get a bit bumpy after that with a lot of onshore flow and lumpy surf through the middle of the week and into the next. There's a big pulse on Thursday, September 17th, with a 8 to 10 foot SW groundswell and a very long 18 second period. That's a 7452 combined energy reading, but the wind is onshore, making it a huge, messy beast. Then Friday the 18th brings a massive 16 foot SW groundswell with an incredible 10551 combined energy value, but with strong onshore winds. For that size and wind, honestly, you're better off with a kite than a paddle. It's an expert-only scenario and even then, it'll be a challenge.
So, to call it: Monday the 7th is the prime pick. Tuesday afternoon is your smaller, cleaner fallback. The big stuff later in the window is huge but let down by the wind.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Thu afternoon. Very mild (max 18°C on Sat afternoon, min 12°C on Thu morning). Mainly strong winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 25°C on Mon afternoon, min 15°C on Sun morning). Winds decreasing (strong winds from the E on Sun morning, calm by Mon night). | ||||||||||||||||||||
Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | |||||||||||||||
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 | S 9 | SSE 9 | S 9 | S 8 | S 8 | SSW 10 | SSW 10 | SW 21 | SSW 18 | SW 16 | SW 15 | SW 14 | SW 13 | SW 12 | SW 12 | SSW 11 | SW 14 | SW 13 | SW 13 | SW 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 763 | 1314 | 1263 | 575 | 304 | 223 | 201 | 218 | 1796 | 4473 | 1992 | 1326 | 1336 | 984 | 666 | 503 | 198 | 248 | 400 | 364 | 325 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-off | glassy | glassy | cross | glassy | cross-off | cross-off | cross | on |
High Tide | 7:09PM1.32m | 7:53AM1.12m | 8:28PM1.19m | 9:44AM1.06m | 10:28PM1.15m | 11:40AM1.14m | 00:06AM1.23m | 12:49PM1.30m | 1:08AM1.36m | 1:37PM1.47m | 1:55AM1.47m | 2:17PM1.61m | 2:35AM1.55m | ||||||||
Low Tide | 12:45PM0.42m | 1:37AM0.44m | 1:53PM0.55m | 3:13AM0.54m | 3:56PM0.62m | 5:16AM0.51m | 5:56PM0.53m | 6:34AM0.38m | 7:05PM0.37m | 7:26AM0.25m | 7:53PM0.22m | 8:07AM0.13m | 8:34PM0.10m | ||||||||
 |  |  |  |  | | | |  | | | | | | | | | | | |  | |
 | 7:00 | — | — | 6:58 | — | — | 6:56 | — | — | 6:56 | — | — | 6:54 | — | — | 6:52 | — | — | 6:52 | — | — |
 | — | 6:24 | — | — | 6:25 | — | — | 6:27 | — | — | 6:28 | — | — | 6:28 | — | — | 6:29 | — | — | 6:30 | — |
mm | 1 | 5 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 14 | 15 | 14 | 15 | 16 | 13 | 16 | 18 | 15 | 18 | 22 | 19 | 24 | 25 | 20 | 22 | 21 | 21 | 18 | 18 | 15 |
Feels °C | 10 | 7 | 7 | 6 | 7 | 4 | 8 | 10 | 7 | 12 | 16 | 17 | 23 | 24 | 21 | 22 | 21 | 21 | 17 | 17 | 16 |
Swell 1 Height (m) Direction Period (s) | WSW 13 | WSW 12 | WSW 12 | S 9 | S 8 | S 8 | SSW 10 | SSW 10 | SW 21 | SSW 18 | SW 16 | SW 15 | SW 14 | SW 13 | SW 12 | SW 12 | SSW 11 | SW 11 | SW 13 | SW 13 | SW 12 |
| kJ | 763 | 365 | 222 | 575 | 304 | 223 | 201 | 218 | 1796 | 4473 | 1992 | 1326 | 1336 | 984 | 666 | 503 | 198 | 176 | 400 | 364 | 325 |
Swell 2 Height (m) Direction Period (s) | S 9 | W 16 | — | WSW 11 | WSW 11 | WSW 11 | WSW 10 | WSW 10 | SSW 10 | — | S 9 | S 15 | SE 10 | ESE 10 | SW 18 | SW 16 | WSW 12 | SW 14 | SSE 8 | SE 9 | ESE 10 |
| kJ | 177 | 5 | — | 109 | 103 | 66 | 59 | 38 | 145 | — | 6 | 5 | 25 | 11 | 49 | 93 | 123 | 248 | 14 | 20 | 20 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | SSW 14 | SSW 13 | SW 13 | WSW 26 | SW 12 | — | S 12 | — | S 14 | SSE 12 | ESE 11 | SE 11 | SW 15 | SSE 9 | SSE 8 | SSE 8 | SSE 7 |
| kJ | — | — | — | — | 19 | 55 | 7 | 65 | 40 | — | 11 | — | 15 | 29 | 12 | 5 | 183 | 27 | 14 | 13 | 5 |
Wind waves Height (m) Direction Period (s) | SSE 8 | S 9 | SSE 9 | ESE 5 | ESE 5 | ESE 4 | ESE 5 | ESE 5 | ESE 5 | ESE 7 | ESE 7 | ESE 6 | — | W 4 | — | — | SE 3 | ESE 3 | — | — | — |
| kJ | 426 | 1314 | 1263 | 61 | 87 | 52 | 75 | 124 | 120 | 573 | 142 | 49 | — | 7 | — | — | 1 | 3 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 941 | 1496 | 1363 | 302 | 86 | 86 | 86 | 86 | 38 | 35 | 10 | 0 | 0 | 0 | 31 | 0 | 0 | 0 | 32 | 10 |
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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