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 (2.4m), 18s period, SW swell with 3,563 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 2.4m 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 1.6m 9s period and expected on Monday (Sep 07) at 5AM.
| 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 (2.4m) 18s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Alright mates, Rusty here. Let’s break down the next couple of weeks at Onrus. It’s a patchy forecast, with plenty of wind and rough water before we get any real quality.
The first few days are a write-off. On Thursday 3rd September, there’s a 10ft swell from the SSE, but it’s blown out by a strong onshore wind at 25 mph. The next few days, through Friday 4th and Saturday 5th, stay ugly – cross-onshore winds and lumpy surf. The combined swell energy is high (1758), but it’s all windslop.
Sunday 6th September brings a big 8ft SSW swell with a very long period of 18 seconds, but it’s still cross-on and messy. The energy is massive (4487), but this is one for the big-wave crew only, and the wind is ruining it. More of a kite-surfing day.
Monday 7th September is the standout. The wind drops to a light 3 mph from the W, going cross-off. You’ve got a solid 6ft SW groundswell with a 14-second period, and the energy is still pumping (1327). The water temperature is 59°, which is about 1° cooler than normal, so it’s a bit chilly. For experienced surfers, this is the morning to be out. Onrus is an inconsistent reef, so you’ll have to wait for sets, but when they come, they’ll be clean and lined. Crowds are possible here.
Tuesday 8th September morning is still looking good, with glassy conditions and a 4ft SW swell at 12 seconds. The energy is moderate (605). A solid backup.
Then it gets shaky again. From Wednesday 9th through Sunday 13th September, there’s a full week of poor surf – cross-on winds and messy conditions.
Monday 14th September (one week away) brings another pulse. It’s a clean offshore morning with an 8ft SSW swell at 16 seconds, and the energy is very strong (3919). This is a big, powerful groundswell with a strong offshore wind from the WNW at 19 mph, so it’ll be clean. But at 8ft, this is expert territory. The long period means the sets will be widely spaced, and the reef will handle it well.
The rest of the second week is mixed, with the wind turning back onshore.
Bottom line: The clear winner is Monday 7th September morning at Onrus. Clean, moderate-sized groundswell, light wind. Tuesday 8th morning is a nice second option. The long-range Monday 14th is a big, powerful swell for experts only. For the rest of the time, you’re better off waiting.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Sun afternoon, min 12°C on Fri night). Mainly strong winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 25°C on Mon morning, min 15°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | ||||||||||||||
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) | SSE 9 | S 9 | SSE 8 | SE 7 | S 10 | SSW 10 | SW 21 | SW 18 | SW 16 | SW 15 | SW 14 | SW 13 | SW 12 | SW 12 | WSW 12 | SW 11 | SW 13 | WSW 13 | WSW 12 |
Wave Graph  | |||||||||||||||||||
 kJ | 1377 | 573 | 597 | 242 | 262 | 218 | 2133 | 3563 | 2269 | 1432 | 1299 | 1069 | 724 | 505 | 106 | 155 | 380 | 290 | 218 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-off | glassy | cross | cross-off | glassy | cross-off | cross | cross | on |
High Tide | 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 | 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 | |||||||
 |  | | | | | |  | | | | | | | | | | |  | |
 | — | 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 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 16 | 16 | 13 | 16 | 19 | 14 | 18 | 23 | 19 | 25 | 24 | 22 | 23 | 23 | 21 | 18 | 19 | 15 |
Feels °C | 6 | 7 | 7 | 4 | 7 | 11 | 7 | 12 | 18 | 17 | 24 | 23 | 21 | 23 | 23 | 21 | 17 | 18 | 16 |
Swell 1 Height (m) Direction Period (s) | WSW 12 | S 9 | WSW 11 | SSW 9 | S 10 | SSW 10 | SW 21 | SW 18 | SW 16 | SW 15 | SW 14 | SW 13 | SW 12 | SW 12 | S 10 | SW 11 | SW 13 | WSW 13 | WSW 12 |
| kJ | 222 | 573 | 105 | 108 | 262 | 218 | 2133 | 3563 | 2269 | 1432 | 1299 | 1069 | 724 | 505 | 92 | 145 | 380 | 290 | 218 |
Swell 2 Height (m) Direction Period (s) | — | WSW 11 | SSW 14 | WSW 11 | WSW 10 | WSW 10 | SSW 10 | S 9 | — | SE 6 | SE 10 | ESE 10 | SW 18 | SW 16 | WSW 12 | SW 14 | ESE 9 | S 8 | SW 6 |
| kJ | — | 109 | 18 | 66 | 59 | 38 | 129 | 14 | — | 41 | 46 | 10 | 50 | 66 | 106 | 155 | 27 | 11 | 28 |
Swell 3 Height (m) Direction Period (s) | — | — | — | SSW 13 | SSW 13 | SW 25 | SW 10 | — | — | — | SSE 14 | SSE 12 | ESE 11 | ESE 10 | SW 11 | SSE 9 | SSE 8 | SSE 8 | SW 17 |
| kJ | — | — | — | 55 | 18 | 100 | 23 | — | — | — | 36 | 30 | 11 | 71 | 76 | 26 | 13 | 6 | 11 |
Wind waves Height (m) Direction Period (s) | SSE 9 | ESE 5 | SSE 8 | SE 7 | ESE 5 | ESE 5 | ESE 5 | ESE 5 | ESE 7 | ENE 4 | — | — | — | — | — | — | W 3 | WSW 4 | — |
| kJ | 1377 | 77 | 597 | 242 | 66 | 124 | 145 | 84 | 163 | 7 | — | — | — | — | — | — | 5 | 8 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 1363 | 1525 | 302 | 86 | 86 | 86 | 86 | 38 | 34 | 10 | 0 | 0 | 4 | 0 | 0 | 0 | 8 | 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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