Surf Forecasts:
Onrus surf forecast from 10 Aug 2026:
- Best quality surf: Monday 17 Aug, 5AM (local time) - 10ft (3.0m), 16s period, WSW swell with cross-onshore winds.
- Most powerful swell: Monday 17 Aug, 5AM (local time) - 10ft (3.0m), 16s period, WSW swell with 4,694 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 5PM (local time) - 7ft (2.1m), 16s 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 5PM. The primary swell is predicted to be 2.1m and 16s period with a secondary swell of 0.5m and 10s. 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 16s and forecast to arrive on Monday (Aug 17) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 10s period and expected on Thursday (Aug 13) at 11AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Thu 13th Aug) | 7ft (2.1m) 16s |
| Best Surf | 5AM (Mon 17th Aug) | 10ft (3.0m) 16s |
| Most Powerful | 5AM (Mon 17th Aug) | 10ft (3.0m) 16s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Alright, this is Rusty, and I’m looking straight at the numbers for our local stretch. To be honest, the next week is a bit of a battle. We’ve got a solid run of swell coming in, but the wind is just not playing ball for most of it.
The first real pulse arrives on Monday the 10th of August with a decent 8ft SSW swell, but it’s packing a lot of energy (2256) and the wind is straight onshore and strong. That’s a hard pass. This pattern of decent swell with messy, cross-onshore wind holds through Tuesday and into Wednesday morning. Wednesday the 12th has a long-period 6ft SW swell (18 seconds) with a cross-shore breeze, making it marginal at best. That long period is a tease – the shape would be there if the wind would just cooperate.
Thursday the 13th afternoon is where things finally unlock. The wind swings around to a light cross-offshore from the NNE at just 3 mph, and we’ve got a 7ft SW swell with a 16-second period and very strong energy (2363). This is excellent, clean surf for experienced surfers. Onrus is exposed to the SW, and this sets up nicely as a real standout.
Friday morning the 14th keeps the good form going with clean, cross-offshore conditions on a 5ft WSW groundswell. The energy is moderate (1142), but the quality is there for a good session.
Then Saturday the 15th and Sunday the 16th are where we get our best chance. Saturday morning is glassy – dead calm wind from the NW – with a clean 5ft WSW swell (876 energy). That’s about as good as it gets for a relaxing, fun session. Sunday afternoon has a clean 6ft WSW swell (1314) with a light cross-offshore breeze. These two days are the highlight of the whole forecast.
Monday the 17th sees the swell pumping up to 10ft from the WSW (4299 energy), but that’s just too much juice for this reef setup, and the wind gets messy again. We drop off into smaller, wind-affected surf through the middle of the week.
The end of the run on Friday the 21st of August shows promise again with a clean 6ft SSE swell, though the period is a short 8 seconds, and then Saturday the 22nd has a fresh offshore wind, but the swell drops right off to under 3ft.
Overall, there are a few days of absolute gold in there – the glassy dawn on Saturday the 15th is the one I’d circle on the calendar. The water temp is sitting around 59°, which is pretty normal for this time of year, so a good 4/3 wetsuit is the call.
Rusty.
Short Range ForecastMostly dry. Warm (max 20°C on Wed afternoon, min 9°C on Tue night). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 25°C on Thu afternoon, min 16°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | |||||||||||||||
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) | SSW 11 | S 10 | SSW 13 | S 12 | SSW 12 | SW 22 | SW 18 | SW 18 | SW 16 | SW 18 | SW 16 | SW 16 | WSW 15 | WSW 15 | WSW 14 | WSW 14 | WSW 13 | WSW 14 | WSW 14 | WSW 14 | WSW 17 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1384 | 832 | 2116 | 1249 | 705 | 1641 | 1946 | 1741 | 2003 | 2912 | 2311 | 1571 | 1102 | 1158 | 929 | 876 | 824 | 829 | 876 | 1314 | 2406 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross | cross | cross-off | cross-off | cross-off | cross-on | cross | glassy | glassy | glassy | cross-off | cross-off | cross-off |
High Tide | 1:47PM1.41m | 2:02AM1.50m | 2:34PM1.55m | 2:49AM1.57m | 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 | ||||||||
Low Tide | 7:58PM0.27m | 8:23AM0.12m | 8:47PM0.15m | 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 | ||||||||
 | |  | | | | | | | | | | |  | | |  |  | | |  | |
 | 7:28 | — | — | 7:26 | — | — | 7:26 | — | — | 7:24 | — | — | 7:24 | — | — | 7:22 | — | — | 7:22 | — | — |
 | — | 6:07 | — | — | 6:08 | — | — | 6:09 | — | — | 6:10 | — | — | 6:10 | — | — | 6:12 | — | — | 6:13 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 13 | 14 | 12 | 14 | 15 | 12 | 15 | 20 | 17 | 21 | 25 | 22 | 23 | 24 | 21 | 22 | 24 | 18 | 18 | 20 | 16 |
Feels °C | 7 | 7 | 6 | 6 | 7 | 5 | 11 | 16 | 12 | 17 | 24 | 19 | 22 | 22 | 18 | 20 | 22 | 17 | 16 | 17 | 14 |
Swell 1 Height (m) Direction Period (s) | SSW 11 | S 10 | SSW 13 | S 12 | SSW 12 | SW 22 | SW 18 | SW 18 | SW 16 | SW 18 | SW 16 | SW 16 | WSW 15 | WSW 15 | WSW 14 | WSW 14 | WSW 13 | WSW 14 | WSW 14 | WSW 14 | WSW 17 |
| kJ | 1384 | 832 | 2116 | 1249 | 705 | 1641 | 1946 | 1741 | 2003 | 2912 | 2311 | 1571 | 1102 | 1158 | 929 | 876 | 824 | 829 | 876 | 1314 | 2406 |
Swell 2 Height (m) Direction Period (s) | SSW 14 | SW 11 | WSW 11 | SW 26 | SW 24 | SSW 11 | SW 10 | SW 10 | SW 22 | ESE 10 | SE 10 | SE 9 | SE 11 | ESE 9 | ESE 9 | ESE 9 | W 4 | ESE 9 | WSW 5 | ESE 9 | WSW 13 |
| kJ | 62 | 347 | 103 | 27 | 287 | 242 | 108 | 65 | 653 | 529 | 52 | 29 | 40 | 180 | 84 | 61 | 6 | 26 | 3 | 29 | 1152 |
Swell 3 Height (m) Direction Period (s) | — | SSW 14 | — | W 16 | WSW 10 | — | SE 8 | S 10 | SE 10 | — | — | — | — | — | — | — | ESE 8 | ESE 10 | WSW 5 | — | E 10 |
| kJ | — | 529 | — | 5 | 10 | — | 45 | 17 | 87 | — | — | — | — | — | — | — | 14 | 9 | 5 | — | 49 |
Wind waves Height (m) Direction Period (s) | S 9 | — | E 3 | SE 8 | ESE 4 | ESE 8 | ENE 3 | ESE 8 | ENE 4 | ESE 10 | — | — | — | ESE 10 | — | WNW 4 | WNW 4 | — | — | — | — |
| kJ | 810 | — | 5 | 478 | 41 | 223 | 9 | 99 | 10 | 115 | — | — | — | 64 | — | 6 | 16 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 40 | 220 | 23 | 45 | 38 | 38 | 10 | 32 | 10 | 10 | 0 | 0 | 0 | 4 | 4 | 0 | 0 | 0 | 0 | 0 | 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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