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 1.2m 10s period and expected on Thursday (Aug 13) at 8PM.
| 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, surfer crew, Rusty here. Got the lowdown for the next couple of weeks. We’ve got a sweet start, a long stretch of junk, and a ripper of a finish, so keep your eyes peeled.
Onrus is the name of the game, and it’s on from the get-go this Thursday morning, the 13th. There’s a solid 7ft SW groundswell with a 17-second period. Lots of energy behind it (2719), meaning some serious push. It’s a reef break that’s exposed to this swell, and a light NNE cross-off breeze is gonna have it glassy. Water temp is about normal for this time of year. This one’s for the experienced crew – a little too much juice for the beginners. But for everyone else, it’s going to be firing.
Friday the 14th is still looking fun. The swell backs off to a clean 5ft from the WSW, with a 15-second period. Energy is moderate (1056), and the offshore from the NNW keeps things nice and clean.
Saturday the 15th the swell is a little smaller at around 5ft. The morning is a bit chopped by cross-on wind, but the afternoon turns magical. The wind drops to glass, creating some ultra-clean peelers. Good day for a longboard. Crowds are a possibility here, so pick your moments.
Sunday the 16th has a bit more west in the wind – a cross-off at 12-16mph – keeping it clean with the swell holding at 5ft to 6ft. It's surfable, but the energy level drops a notch.
Monday the 17th sees a bump in size back up to 7-8ft, but a light cross-on wind puts a slight crinkle on the surface. It’s got power for the experienced surfer, but not as perfect as the earlier days.
From Tuesday the 18th all the way through to Wednesday the 26th, we’re looking at a big lull. The wind goes onshore at times, the swell drops off, and the energy just fades away. The 20th, 21st, and 25th are total write-offs with fresh, choppy onshores. It’s a solid run of poor conditions, a real dry spell, so don't plan anything.
But hold on, because the end of the period is where the gold is. On Thursday the 27th, the afternoon is looking like an absolute standout. Wind goes dead calm, flat glass, and a clean 7ft SW swell rolls in with a long 16-second period. The energy is strong (2354) and the conditions are going to be as good as it gets at Onrus. This is the day to circle. The next morning, Friday the 28th, there’s a bigger 8ft swell, but the wind is more cross-shore, which could mess with the perfection. The 27th is your winner.
That Thursday the 27th is the one. Glassy, powerful, and clean. Friday the 28th is one for the experts only, pushing 8 feet.
Stay stoked.
Rusty
Short Range ForecastMostly dry. Warm (max 25°C on Thu afternoon, min 13°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 20°C on Sun afternoon, min 14°C on Tue morning). Wind will be generally light. | ||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | ||||||||||||||
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 16 | SW 17 | SW 16 | SW 16 | WSW 15 | WSW 15 | WSW 14 | WSW 13 | WSW 13 | WSW 14 | WSW 14 | WSW 14 | WSW 14 | WSW 13 | WSW 13 | WSW 13 | WSW 12 | WSW 12 | SW 12 |
Wave Graph | |||||||||||||||||||
1899 | 2719 | 2058 | 1513 | 1038 | 974 | 889 | 863 | 781 | 933 | 854 | 1114 | 1921 | 1783 | 1619 | 1103 | 762 | 452 | 792 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-on | cross-off | cross-off | cross-off | cross-off | cross-on | glassy | off | cross-off | cross-off | cross-off | cross-on | cross-on | off | cross-off | cross-off | cross-on |
High Tide | 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 | 9:30PM0.07m | 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 | ||||||
— | 7:24 | — | — | 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 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 17 | 21 | 25 | 22 | 20 | 19 | 15 | 16 | 19 | 18 | 17 | 20 | 16 | 18 | 19 | 15 | 17 | 17 | 14 |
Feels °C | 12 | 18 | 23 | 20 | 17 | 15 | 13 | 15 | 18 | 18 | 14 | 15 | 13 | 17 | 17 | 15 | 14 | 13 | 11 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 17 | SW 16 | SW 16 | WSW 15 | WSW 15 | WSW 14 | WSW 13 | WSW 13 | WSW 14 | WSW 14 | WSW 14 | WSW 14 | WSW 13 | WSW 13 | WSW 13 | WSW 12 | WSW 12 | SW 12 |
1899 | 2719 | 2058 | 1513 | 1038 | 974 | 889 | 863 | 781 | 933 | 854 | 1114 | 1921 | 1783 | 1619 | 1103 | 762 | 452 | 792 | |
Swell 2 Height (m) Direction Period (s) | SW 22 | ESE 11 | SE 10 | ESE 9 | SE 11 | ESE 10 | W 6 | W 6 | SW 7 | ESE 4 | ESE 9 | ESE 8 | WSW 18 | ESE 12 | SW 15 | SW 14 | SW 12 | SW 12 | WSW 11 |
653 | 79 | 37 | 168 | 18 | 96 | 25 | 17 | 53 | 5 | 15 | 12 | 62 | 26 | 221 | 218 | 256 | 416 | 217 | |
Swell 3 Height (m) Direction Period (s) | SE 11 | — | — | — | — | — | E 9 | ESE 9 | — | ESE 9 | — | — | E 10 | — | ESE 10 | E 11 | E 11 | E 10 | E 10 |
71 | — | — | — | — | — | 42 | 26 | — | 25 | — | — | 8 | — | 22 | 21 | 9 | 9 | 8 | |
Wind waves Height (m) Direction Period (s) | ENE 4 | — | — | — | WNW 5 | W 5 | — | — | ESE 4 | — | W 4 | W 4 | — | — | — | — | W 4 | — | — |
20 | — | — | — | 42 | 73 | — | — | 14 | — | 10 | 22 | — | — | — | — | 18 | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 10 | 0 | 4 | 0 | 0 | 50 | 0 | 10 | 0 | 0 | 31 | 60 | 0 | 10 | 4 | 0 | 31 | 221 | 272 |
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.











