Surf Forecasts:
Onrus surf forecast from 12 Aug 2026:
- Best quality surf: Thursday 13 Aug, 11AM (local time) - 7ft (2.1m), 17s period, SW swell with cross-offshore winds.
- Most powerful swell: Thursday 13 Aug, 11AM (local time) - 7ft (2.1m), 17s period, SW swell with 2,719 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 11AM (local time) - 7ft (2.1m), 17s 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 Thursday (Aug 13) at 11AM. The primary swell is predicted to be 2.1m and 17s period. 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 17s and forecast to arrive on Thursday (Aug 13) at 11AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 10s period and expected on Thursday (Aug 13) at 11PM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Thu 13th Aug) | 7ft (2.1m) 17s |
| Best Surf | 11AM (Thu 13th Aug) | 7ft (2.1m) 17s |
| Most Powerful | 11AM (Thu 13th Aug) | 7ft (2.1m) 17s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get into what’s cooking for Onrus.
We’ve got a spell of proper groundswell heading our way, but the wind is gonna be the main character for the first few days. The water is sitting at 58°, which is a bit colder than normal for this time of year, so don’t forget the rubber.
The first real chance to paddle out starts Thursday, the 13th, in the morning. We’ve got a clean 7ft SW swell with a long 17-second period pushing in. The wind is a gentle cross-offshore breeze, and the combined wave energy is pumping at 2719. This is excellent for experienced surfers – that’s a lot of power and the sets will be proper. Thursday morning is a standout. By the afternoon the wind swings light cross-on, but the swell is still 7ft and clean enough for a session.
Friday the 14th is a good one too. Morning brings offshore winds from the NW with a 5ft WSW groundswell at 15 seconds. The energy is 1120, and it’s clean. The guys who can handle it will be rewarded. The afternoon holds clean cross-offshore breeze with a 5ft WSW swell.
Saturday the 15th is the real gem. Morning is glassy, flat calm, with a 5ft WSW swell. The energy is 882, but the glassy conditions make it feel like a million bucks. Waves will be clean and lined up. The afternoon is glassy again with some clouds. This is the best of the weekend for the intermediate surfer who wants smooth, clean walls.
Sunday the 16th gets a bit windier with a moderate cross-offshore breeze, but the swell holds at 5-5ft. It’s still clean but not as perfect as Saturday.
We hit a bit of a lull from Monday the 17th through to Wednesday the 19th. The swell jumps up to 8-8ft, but the wind is onshore or cross-onshore, and the quality drops. The setup looks more interesting for kite surfing than paddle surfing during this stretch with those choppy, lumpy conditions and strong winds.
Thursday the 20th into the weekend of the 21st and 22nd is poor. Small swell, onshore winds, and messy conditions. Not worth the drive.
Monday the 24th brings a change. A small 3ft SSW swell, but the wind is offshore from the NW at 15-19 mph. It’s clean and will be fun for a longboard or a fish, but the size is small. The energy is only 418, so it’s a weak day.
Then we get a sneak peek at Tuesday the 25th of August. A 5ft SW swell with a 19-second period – that’s seriously long period groundswell. The morning is clean with a cross-offshore breeze. The energy is 608. This is a long-range standout, so keep an eye on it. It’s a bit less certain, but if it comes together, it will be good at the reef.
Thursday the 27th finishes us off strong. Morning has a 6ft WSW swell with offshore breezes, and the afternoon goes glassy with a 6ft WSW swell. Excellent surf conditions for experienced surfers in the afternoon. That’s a great way to wrap up the 16-day window.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Thu afternoon, min 10°C on Wed morning). Winds decreasing (fresh winds from the ENE on Wed morning, calm by Fri night). | Days 4-6 Weather SummaryMostly dry. Warm (max 20°C on Sat afternoon, min 13°C on Mon morning). Wind will be generally light. | ||||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | |||||||||||||||
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 19 | SW 18 | SW 16 | SW 17 | SW 16 | SW 16 | WSW 15 | WSW 15 | WSW 14 | WSW 13 | WSW 13 | WSW 14 | WSW 14 | WSW 15 | WSW 14 | WSW 13 | WSW 13 | WSW 13 | WSW 12 | WSW 12 | SW 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1798 | 1741 | 1899 | 2719 | 2058 | 1513 | 1102 | 974 | 889 | 863 | 824 | 933 | 854 | 1024 | 1933 | 1783 | 1647 | 1359 | 967 | 850 | 349 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross-off | cross-on | cross-off | off | cross-off | glassy | glassy | glassy | cross-off | cross-off | cross-off | glassy | cross-on | on | glassy | cross | cross-on | cross-on |
High Tide | 3:16PM1.67m | 3:31AM1.61m | 3:54PM1.73m | 4:09AM1.60m | 4:31PM1.74m | 4:46AM1.55m | 5:06PM1.69m | 5:21AM1.47m | 5:39PM1.60m | 5:55AM1.37m | 6:12PM1.47m | 6:30AM1.25m | 6:46PM1.33m | ||||||||
Low Tide | 9:04AM0.04m | 9:30PM0.07m | 9:42AM-0.00m | 10:10PM0.04m | 10:18AM0.00m | 10:47PM0.05m | 10:52AM0.06m | 11:23PM0.12m | 11:25AM0.15m | 11:57PM0.21m | 11:56AM0.26m | 00:31AM0.33m | 12:28PM0.39m | 1:06AM0.45m | |||||||
 | |  | | | | | | | |  | | | |  | | | | | | | |
 | 7:26 | — | — | 7:24 | — | — | 7:24 | — | — | 7:22 | — | — | 7:22 | — | — | 7:20 | — | — | 7:20 | — | — |
 | — | 6:09 | — | — | 6:10 | — | — | 6:10 | — | — | 6:12 | — | — | 6:13 | — | — | 6:13 | — | — | 6:14 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 20 | 15 | 21 | 25 | 22 | 21 | 20 | 15 | 18 | 20 | 19 | 18 | 19 | 15 | 16 | 18 | 16 | 15 | 16 | 13 |
Feels °C | 9 | 16 | 10 | 18 | 24 | 21 | 18 | 16 | 14 | 17 | 19 | 19 | 14 | 14 | 13 | 14 | 15 | 14 | 15 | 15 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 19 | SW 18 | SW 16 | SW 17 | SW 16 | SW 16 | WSW 15 | WSW 15 | WSW 14 | WSW 13 | WSW 13 | WSW 14 | WSW 14 | WSW 15 | WSW 14 | WSW 13 | WSW 13 | WSW 13 | WSW 12 | WSW 12 | SW 12 |
| kJ | 1798 | 1741 | 1899 | 2719 | 2058 | 1513 | 1102 | 974 | 889 | 863 | 824 | 933 | 854 | 1024 | 1933 | 1783 | 1647 | 1359 | 967 | 850 | 349 |
Swell 2 Height (m) Direction Period (s) | SW 10 | SSW 10 | SW 22 | ESE 12 | SE 11 | ESE 9 | SE 11 | ESE 10 | W 6 | WSW 6 | SW 6 | E 9 | ESE 9 | ESE 10 | — | ESE 10 | — | SW 13 | WSW 13 | SW 12 | WSW 11 |
| kJ | 108 | 68 | 653 | 117 | 75 | 168 | 18 | 98 | 10 | 10 | 8 | 39 | 15 | 18 | — | 19 | — | 563 | 554 | 367 | 280 |
Swell 3 Height (m) Direction Period (s) | SE 8 | SE 9 | SE 11 | — | — | — | — | — | W 6 | W 5 | ESE 10 | — | — | — | — | — | — | — | ESE 5 | ESE 11 | SE 8 |
| kJ | 25 | 39 | 71 | — | — | — | — | — | 16 | 9 | 10 | — | — | — | — | — | — | — | 11 | 37 | 2 |
Wind waves Height (m) Direction Period (s) | E 4 | E 4 | ENE 4 | — | — | — | WNW 4 | W 4 | — | — | ESE 9 | — | W 4 | W 5 | — | — | ESE 10 | ESE 4 | — | W 4 | — |
| kJ | 33 | 23 | 19 | — | — | — | 13 | 24 | — | — | 92 | — | 9 | 42 | — | — | 19 | 33 | — | 11 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 35 | 10 | 10 | 0 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 31 | 60 | 0 | 10 | 45 | 0 | 8 | 32 | 4 |
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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