Surf Forecasts:
Onrus surf forecast from 15 Sep 2026:
- Best quality surf: Tuesday 15 Sep, 11PM (local time) - 10ft (3.0m), 15s period, SW swell with cross-offshore winds.
- Most powerful swell: Tuesday 15 Sep, 11PM (local time) - 10ft (3.0m), 15s period, SW swell with 3,477 kJ wave energy.
- Next surfable swell (1★+): Tuesday 15 Sep, 11PM (local time) - 10ft (3.0m), 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 Tuesday (Sep 15) at 11PM. The primary swell is predicted to be 3.0m and 15s period with a secondary swell of 2.3m and 15s. Another secondary swell of 1.4m and 9s is also forecast. 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 3.0m 15s and forecast to arrive on Tuesday (Sep 15) at 11PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 9s period and expected on Monday (Sep 21) at 5AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Tue 15th Sep) | 10ft (3.0m) 15s |
| Best Surf | 11PM (Tue 15th Sep) | 10ft (3.0m) 15s |
| Most Powerful | 11PM (Tue 15th Sep) | 10ft (3.0m) 15s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's on the cards for the next couple of weeks at Onrus.
Right off the bat, we've got a bit of a waiting game. The first few days are a write-off thanks to a gale-force offshore wind that, while clean, makes it near impossible to paddle into anything. Tuesday morning the 15th has a 2ft SW groundswell with an 18-second period, but with that 25 mph NW wind, it's just not worth the fight. The energy is actually quite strong, but you'll never get out.
We then hit a real rough patch. From Wednesday the 16th right through to Monday the 22nd, it’s all onshore wind and messy conditions. The waves are there but the quality is completely stuffed. The swell actually gets pretty solid on the 16th with an 8ft SW swell, but the SE wind is just wrecking it. This is a long stretch of poor surf, so don't hold your breath.
Things finally start to look up on Wednesday the 23rd. There’s a moderate offshore wind from the NW, and while the swell is only 3ft with a 10-second period, it’s clean and surfable. The energy is weak, but it's a start. This is the light at the end of the tunnel.
The real standout is Thursday the 24th of September. This is the one to circle on your calendar. We’ve got an 8ft SSW groundswell with a 14-second period, which is a lot of water moving around. The combined energy is pumping, so it’s very strong. The wind is a light cross-offshore breeze making it clean, but for experienced surfers only. This kind of size on a reef break like Onrus will be serious.
Friday the 25th is still decent, with a cleaner 4.5ft SW swell in the morning, but it's not the same level as Thursday. After that, the wind swings back onshore for the weekend and it gets messy again.
Looking into the first week of October, there’s another chance. Tuesday the 29th of September shows a clean 5ft SSE swell with light cross-offshore winds and a clean energy. It's worth a look. Then Wednesday the 30th has a clean 3.5ft SW groundswell with a 13-second period and a nice offshore wind. That’s a promising one for the end of the forecast period, but it's a long way out so don't bank on it just yet.
All in all, Thursday the 24th is the undisputed king of this outlook. Get out there if you've got the skills.
Short Range ForecastHeavy rain (total 22mm), heaviest during Tue night. Very mild (max 19°C on Tue afternoon, min 12°C on Tue night). Mainly strong winds. | Days 4-6 Weather SummaryMostly dry. Very mild (max 19°C on Sat afternoon, min 13°C on Fri morning). Winds decreasing (strong winds from the ESE on Fri afternoon, light winds from the ESE by Sun night). | ||||||||||||||||||||
Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | |||||||||||||||
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 18 | SW 16 | SW 14 | SW 14 | WSW 13 | SW 13 | SSW 12 | SW 12 | SSW 11 | SW 11 | SW 13 | SW 12 | SW 12 | SW 12 | SW 14 | SW 14 | SW 13 | WSW 12 | WSW 12 | WSW 12 | WSW 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 192 | 719 | 3236 | 2686 | 1155 | 2107 | 1580 | 1070 | 1032 | 640 | 802 | 645 | 389 | 349 | 1135 | 1398 | 1094 | 702 | 443 | 289 | 215 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | cross-on | on | on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | on | on | on | cross-on | cross-on | cross-on |
High Tide | 5:29PM1.45m | 5:48AM1.29m | 5:59PM1.31m | 6:20AM1.17m | 6:32PM1.17m | 7:03AM1.04m | 7:21PM1.04m | 8:35AM0.94m | 9:27PM0.96m | 11:23AM0.98m | 11:40PM1.02m | 12:29PM1.10m | 00:36AM1.13m | ||||||||
Low Tide | 11:18AM0.28m | 11:43PM0.30m | 11:46AM0.40m | 00:13AM0.43m | 12:16PM0.52m | 00:49AM0.55m | 12:56PM0.65m | 1:53AM0.67m | 2:37PM0.76m | 4:44AM0.69m | 5:48PM0.72m | 6:14AM0.59m | 6:45PM0.59m | ||||||||
 |  |  | | |  |  | |  | | | | | | | | | | | | | |
 | 6:43 | — | — | 6:41 | — | — | 6:39 | — | — | 6:39 | — | — | 6:37 | — | — | 6:35 | — | — | 6:35 | — | — |
 | — | 6:34 | — | — | 6:35 | — | — | 6:35 | — | — | 6:36 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — |
mm | — | — | 22 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 19 | 15 | 15 | 15 | 13 | 16 | 16 | 13 | 17 | 17 | 15 | 17 | 19 | 16 | 17 | 17 | 16 | 16 | 17 | 16 |
Feels °C | 9 | 10 | 7 | 9 | 8 | 8 | 9 | 8 | 7 | 8 | 8 | 7 | 13 | 14 | 12 | 14 | 14 | 13 | 13 | 14 | 13 |
Swell 1 Height (m) Direction Period (s) | SW 11 | SW 16 | SW 14 | SW 14 | WSW 13 | SW 13 | SSW 12 | SW 12 | SSW 11 | SW 11 | SW 13 | SW 12 | SW 12 | SW 12 | SW 14 | SW 14 | SW 13 | WSW 12 | WSW 12 | WSW 12 | WSW 11 |
| kJ | 116 | 719 | 3236 | 2686 | 1155 | 2107 | 1580 | 1070 | 1032 | 640 | 802 | 645 | 389 | 349 | 1135 | 1398 | 1094 | 702 | 443 | 289 | 215 |
Swell 2 Height (m) Direction Period (s) | SW 18 | SE 13 | WNW 8 | WSW 13 | SW 13 | W 13 | — | — | — | SW 14 | SW 18 | SW 16 | SW 14 | SW 14 | ESE 10 | — | — | — | S 6 | SW 7 | SSE 6 |
| kJ | 192 | 7 | 161 | 101 | 553 | 408 | — | — | — | 241 | 12 | 40 | 214 | 167 | 10 | — | — | — | 67 | 14 | 39 |
Swell 3 Height (m) Direction Period (s) | SE 13 | — | ESE 11 | ESE 11 | ESE 11 | — | — | — | — | — | — | — | — | SSW 18 | — | — | — | — | ESE 10 | — | SW 14 |
| kJ | 7 | — | 42 | 24 | 23 | — | — | — | — | — | — | — | — | 31 | — | — | — | — | 18 | — | 51 |
Wind waves Height (m) Direction Period (s) | WNW 6 | WNW 7 | — | — | S 7 | SE 6 | SE 6 | SE 5 | SE 6 | SE 5 | ESE 6 | ESE 5 | SE 6 | SSE 5 | SSE 6 | SSE 6 | SSE 5 | SE 5 | SSE 6 | S 6 | E 3 |
| kJ | 190 | 668 | — | — | 113 | 141 | 154 | 51 | 154 | 111 | 170 | 94 | 71 | 72 | 71 | 81 | 55 | 25 | 132 | 97 | 5 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 199 | 103 | 89 | 253 | 245 | 23 | 247 | 1252 | 4 | 95 | 101 | 86 | 23 | 272 | 4 | 4 | 315 | 10 | 4 | 4 | 23 |
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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