Surf Forecasts:
Onrus surf forecast from 15 Sep 2026:
- Best quality surf: Wednesday 16 Sep, 2AM (local time) - 10ft (3.0m), 14s period, WSW swell with cross-shore winds.
- Most powerful swell: Wednesday 16 Sep, 2AM (local time) - 10ft (3.0m), 14s period, WSW swell with 3,504 kJ wave energy.
- Next surfable swell (1★+): Wednesday 16 Sep, 2AM (local time) - 10ft (3.0m), 14s 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 Wednesday (Sep 16) at 2AM. The primary swell is predicted to be 3.0m and 14s period with a secondary swell of 1.1m and 8s. The wind is predicted to be cross-shore 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 Wednesday (Sep 16) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 10s period and expected on Monday (Sep 21) at 2AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Wed 16th Sep) | 10ft (3.0m) 14s |
| Best Surf | 2AM (Wed 16th Sep) | 10ft (3.0m) 14s |
| Most Powerful | 2AM (Wed 16th Sep) | 10ft (3.0m) 14s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Right then, Rusty here. Let’s have a look at what Onrus has in store.
First thing you gotta know: the water’s sitting at 58°F, which is a bit colder than normal for this time of year. That anomaly of 2°F will have you reaching for the extra rubber.
Alright, so here we go. This is a proper frustrating forecast for us in the near term. There’s a gap of a full week with nothing worth paddling out for, starting from now. The first glimmer of hope isn't until Tuesday the 24th of September.
Tuesday 24th September is our standout. Onrus is a reef break, exposed to the SW, and we’ve got a nice 6ft SW swell rolling in with a long 13-second period. That’s proper groundswell energy, 1060 (moderate combined energy). The wind is a light WSW at just 6 mph, giving us a clean, cross-off breeze. This one is for the experienced crew, though – it's not a beginner wave at that size with that period. The morning looks excellent, and the afternoon is still worth it with a light cross-shore. Just a heads up, Onrus can get crowded sometimes, so expect a few locals out.
Wednesday 25th September you’ve got another chance. The swell is up to 6ft in the morning, still from the SW with that 13-second period, and the wind is a fresh offshore from the WNW at 19 mph. That’ll be clean but hard work to paddle into. The afternoon sees the swell push to 7ft – that's expert territory – but the wind eases to a moderate 16 mph from the west, keeping it cross-off and clean.
After that, it pretty much falls apart again. From Thursday the 26th through to the end of the run, it’s onshore winds and messy surf with a few long-period swells but no decent windows of clean conditions. Monday the 28th of September gets a big pulse of 12ft SSW swell (5033 combined energy – very strong), but the onshore wind is going to smash it up. That setup with the beach and reef would look way more interesting for a kite surfer than a paddle surfer to be honest.
So to wrap it up: ride the 24th and make the most of the 25th if you’re keen and experienced. The rest is a write-off.
Rusty.
Short Range ForecastModerate rain (total 18mm), heaviest on Tue night. Very mild (max 18°C on Tue afternoon, min 11°C on Wed night). Winds decreasing (near gales from the NW on Tue afternoon, light winds from the ESE by Wed night). | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Sat night. Very mild (max 18°C on Fri afternoon, min 13°C on Fri morning). Winds decreasing (strong winds from the ESE on Fri afternoon, light winds from the E 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 | WSW 14 | SW 9 | WSW 13 | SW 13 | SW 12 | SSW 12 | SSW 11 | SW 11 | SW 13 | SW 12 | SW 12 | SW 12 | SW 13 | SW 14 | SW 14 | SW 13 | WSW 12 | SW 12 | SW 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 192 | 719 | 3504 | 654 | 1306 | 2000 | 1524 | 1355 | 1045 | 640 | 1053 | 812 | 448 | 389 | 852 | 1307 | 1849 | 1192 | 647 | 594 | 431 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | cross | on | on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | on | on | cross-on | cross-on | 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 | — | — | 18 | — | — | — | — | — | — | — | — | — | — | — | 3 | — | — | — | — | — | — |
Temp °C | 17 | 18 | 14 | 15 | 16 | 13 | 14 | 16 | 14 | 17 | 18 | 15 | 16 | 16 | 16 | 16 | 16 | 15 | 17 | 19 | 15 |
Feels °C | 9 | 9 | 5 | 9 | 10 | 8 | 9 | 9 | 8 | 8 | 9 | 8 | 10 | 12 | 12 | 14 | 13 | 12 | 14 | 14 | 11 |
Swell 1 Height (m) Direction Period (s) | SW 11 | SW 16 | WSW 14 | SW 9 | WSW 13 | SW 13 | SW 12 | SSW 12 | SSW 11 | SW 11 | SW 13 | SW 12 | SW 12 | SW 12 | SW 13 | SW 14 | SW 14 | SW 13 | WSW 12 | SW 12 | SW 11 |
| kJ | 116 | 719 | 3504 | 654 | 1306 | 2000 | 1524 | 1355 | 1045 | 640 | 1053 | 812 | 448 | 389 | 852 | 1307 | 1849 | 1192 | 647 | 594 | 431 |
Swell 2 Height (m) Direction Period (s) | SW 18 | SE 13 | WNW 8 | WSW 13 | SW 13 | W 13 | — | — | — | SW 14 | — | SW 16 | SW 14 | SW 14 | ESE 10 | SE 10 | — | ESE 10 | SE 10 | E 10 | WSW 13 |
| kJ | 192 | 7 | 165 | 648 | 480 | 408 | — | — | — | 293 | — | 40 | 245 | 248 | 56 | 4 | — | 42 | 4 | 2 | 35 |
Swell 3 Height (m) Direction Period (s) | SE 13 | S 9 | ESE 11 | SW 14 | E 11 | E 10 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | E 9 |
| kJ | 7 | 2 | 42 | 596 | 9 | 9 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Wind waves Height (m) Direction Period (s) | WNW 6 | WNW 7 | — | — | S 7 | — | E 10 | SE 5 | SE 5 | SE 5 | SE 5 | SE 5 | SE 5 | SE 6 | SSE 6 | S 5 | SE 10 | ESE 10 | ESE 3 | SE 4 | — |
| kJ | 190 | 686 | — | — | 103 | — | 8 | 110 | 111 | 60 | 96 | 59 | 73 | 59 | 43 | 43 | 251 | 149 | 5 | 40 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 199 | 103 | 220 | 250 | 245 | 10 | 38 | 247 | 4 | 1247 | 1247 | 95 | 38 | 296 | 4 | 4 | 272 | 4 | 10 | 389 | 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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