Surf Forecasts:
Onrus surf forecast from 2 Sep 2026:
- Best quality surf: Monday 7 Sep, 2AM (local time) - 5ft (1.6m), 15s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 6 Sep, 11AM (local time) - 7ft (2.1m), 18s period, SW swell with 2,586 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 2AM (local time) - 5ft (1.6m), 15s 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 2AM. The primary swell is predicted to be 1.6m and 15s period with a secondary swell of 0.6m and 6s. 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 2.1m 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 1.4m 7s period and expected on Sunday (Sep 06) at 11AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Mon 7th Sep) | 5ft (1.6m) 15s |
| Best Surf | 2AM (Mon 7th Sep) | 5ft (1.6m) 15s |
| Most Powerful | 11AM (Sun 6th Sep) | 7ft (2.1m) 18s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about what’s coming our way for Onrus.
Straight up, we’ve got a rough start with a long gap of nothing really worth paddling out for from September 2nd right the way through to the morning of Monday, September 7th. Strong onshore winds and messy conditions mean you’re better off leaving the board in the car. There’s a sneaky bit of size on the 6th, with a 7ft SW swell coming from a very long 18-second period, but the east wind is just ruining it.
Now, Monday morning, September 7th, is where it gets interesting. The wind drops right out – we’re talking glassy conditions with a light breeze from the NW. You’re looking at a solid 6ft SW groundswell (period 14 seconds) pumping in with some serious energy (1167). That’s not beginner territory, it’s a bit overhead and will take some positioning, but for the experienced crew, this is the standout session of the window. The water temp is sitting at 59°, which is pretty average for this time of year, no surprises there. This is a reef break and it’s inconsistent, so you’ll have to be patient and pick your moments, but when those sets come through, it’ll be worth the wait. Crowds can pop up here sometimes, but with the quality this good, it’s understandable.
That clean spell holds into Tuesday, September 8th, with a smaller 4ft SW swell and clean cross-offshore winds. Not the size of Monday, but still a really fun wave.
After that, things get messy again until we look further out. The real long-range promise lands on Tuesday afternoon, September 15th. Fresh offshore wind from the WNW will be grooming a solid 6ft SW swell with a very long 16-second period and some strong energy behind it (1731). That’s a proper groundswell setup that will love the reef. It’s a week and a half away, so you’ve got to keep an eye on it, but if it holds, that’s a serious afternoon session.
Before that, Monday morning, September 14th, also offers a tidy, glassy 5ft SSW swell (12 seconds) that is a more manageable option for the intermediate surfer looking for clean waves.
Honestly, the two real standouts are the 7th and the 15th. The 7th for the off-the-charts glass and the 15th for the power and clean offshores.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Thu morning. Very mild (max 17°C on Fri afternoon, min 11°C on Wed night). Winds increasing (light winds from the S on Wed afternoon, near gales from the ESE by Fri afternoon). | Days 5-7 Weather SummaryMostly dry. Warm (max 25°C on Sun afternoon, min 14°C on Sat night). Winds decreasing (strong winds from the E on Sat afternoon, calm by Sun night). | |||||||||||||||||||
Wed 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | ||||||||||||||
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 13 | WSW 13 | WSW 13 | S 9 | SSE 9 | SSE 9 | SSE 8 | SSE 8 | SSW 10 | SSW 10 | SW 21 | SW 18 | SW 16 | SW 15 | SW 14 | SW 13 | SSW 12 | SW 12 | WSW 12 | SW 14 |
Wave Graph  | ||||||||||||||||||||
 kJ | 2241 | 1338 | 763 | 1032 | 1347 | 828 | 547 | 270 | 205 | 169 | 1128 | 2586 | 1571 | 1025 | 1107 | 905 | 353 | 448 | 106 | 211 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-off | glassy | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 6:18PM1.46m | 6:47AM1.24m | 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 | |||||||
Low Tide | 00:39AM0.31m | 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 | ||||||||
 |  |  | |  | | |  | | | | | | | | | | | | | |
 | — | — | 7:00 | — | — | 6:58 | — | — | 6:56 | — | — | 6:56 | — | — | 6:54 | — | — | 6:52 | — | — |
 | 6:24 | — | — | 6:24 | — | — | 6:25 | — | — | 6:27 | — | — | 6:28 | — | — | 6:28 | — | — | 6:29 | — |
mm | — | — | 1 | 2 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 14 | 15 | 15 | 14 | 15 | 17 | 14 | 16 | 19 | 15 | 19 | 25 | 18 | 20 | 22 | 17 | 18 | 19 | 16 |
Feels °C | 14 | 13 | 9 | 8 | 7 | 6 | 8 | 5 | 7 | 10 | 8 | 14 | 22 | 16 | 20 | 20 | 17 | 17 | 17 | 14 |
Swell 1 Height (m) Direction Period (s) | SW 13 | WSW 13 | WSW 13 | WSW 12 | WSW 12 | WSW 11 | WSW 11 | SSE 8 | SSW 10 | SSW 10 | SW 21 | SW 18 | SW 16 | SW 15 | SW 14 | SW 13 | SSW 12 | SW 12 | SW 11 | SW 11 |
| kJ | 2241 | 1338 | 763 | 365 | 222 | 109 | 103 | 270 | 205 | 169 | 1128 | 2586 | 1571 | 1025 | 1107 | 905 | 353 | 448 | 94 | 123 |
Swell 2 Height (m) Direction Period (s) | — | S 9 | — | — | — | S 15 | SSW 14 | WSW 11 | WSW 10 | WSW 10 | SSW 10 | S 9 | S 9 | SE 6 | SE 11 | SSE 6 | WSW 12 | SW 16 | WSW 12 | SW 14 |
| kJ | — | 137 | — | — | — | 4 | 19 | 66 | 41 | 38 | 96 | 15 | 6 | 30 | 30 | 4 | 224 | 93 | 106 | 211 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | SSW 14 | SSW 13 | SSW 13 | SW 25 | SW 12 | — | S 12 | SE 10 | SSE 13 | SW 21 | W 4 | S 11 | S 10 | S 10 |
| kJ | — | — | — | — | — | — | 37 | 56 | 18 | 25 | 25 | — | 25 | 50 | 60 | 17 | 2 | 110 | 52 | 44 |
Wind waves Height (m) Direction Period (s) | — | — | S 9 | S 9 | SSE 9 | SSE 9 | SSE 8 | ESE 5 | ESE 5 | ESE 5 | ESE 5 | ESE 7 | ESE 7 | ESE 10 | W 4 | W 5 | WNW 4 | W 4 | — | — |
| kJ | — | — | 347 | 1032 | 1347 | 828 | 547 | 61 | 133 | 147 | 162 | 186 | 138 | 281 | 11 | 45 | 5 | 2 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 25 | 10 | 82 | 874 | 1363 | 1525 | 3825 | 86 | 86 | 86 | 45 | 38 | 4 | 0 | 0 | 0 | 0 | 0 | 50 | 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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