
Surf Forecasts:
Onrus surf forecast from 11 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 8AM (local time) - 10ft (3.0m), 12s period, SW swell with 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 8s period and expected on Wednesday (Aug 12) at 5AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Thu 13th Aug) | 7ft (2.1m) 17s |
| Best Surf | 8AM (Tue 18th Aug) | 10ft (3.0m) 12s |
| Most Powerful | 11AM (Thu 13th Aug) | 7ft (2.1m) 17s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
G'day, Rusty here. Let's have a look at what's on the table for the next couple of weeks. We've got a bit of a mixed bag, but some real gems are lining up if you're patient.
The water temperature is sitting at 59°F which is a touch cooler than usual for this time of year, but nothing too wild.
The first few days, Tuesday and Wednesday, are a write-off. Strong cross-onshore winds and messy conditions mean the surf is poor, and we're looking at a couple of days where you're better off staying home.
Thursday the 13th morning is where it starts to get interesting. Onrus is a reef break that's inconsistent, but when it's on, it's on. We've got a clean 7ft SSW swell with a period of 17 seconds – that's a proper long-period groundswell, packing a lot of energy (2719). The wind is a gentle cross-offshore, so the waves will be clean and well-shaped. This is excellent for experienced surfers, with a solid, powerful swell. For a reef break, that long period should wrap in nicely.
Friday the 14th morning is a real standout. The wind goes glassy, dead calm, with a 5ft WSW swell and a 15-second period. The combined energy is moderate (1030), but the conditions will be perfect. That's a great morning for a more relaxed session, though the swell is a bit smaller than Thursday.
Saturday the 15th and Sunday the 16th are a step down – light cross-onshore winds and smaller swell keep things marginal, though Sunday morning does have a clean 5ft swell with a cross-offshore breeze.
Monday the 17th is another cracker. Clean conditions again, with a 7ft WSW swell and a 13-second period, and the energy is moderate (1643). This is excellent for experienced surfers, and the consistent wind will keep the waves lined up.
Tuesday the 18th morning, the swell jumps to 10ft from the SW, and while the wind is clean, that's too big for Onrus, even for experts. The afternoon eases to 8ft, which is still on the bigger side.
The following week, from the 19th to the 26th, the surf is more marginal. There are a few clean moments, like the 21st morning with a 6ft SW swell and cross-offshore wind, and the 24th morning with glassy conditions and a 5ft SSW swell. But overall, the consistency drops, and the wind is often cross-onshore. The standout for the second week is the 21st morning – it's a nice, clean session, but nothing like the punch of the first week.
The best of the best for the whole outlook is Thursday the 13th morning. The combination of a big, long-period swell, clean conditions, and a reef break setup makes for a serious session. If you can only get out once, that's your window.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Thu afternoon, min 9°C on Tue night). Winds decreasing (strong winds from the E on Tue afternoon, calm by Thu afternoon). | Days 4-6 Weather SummaryMostly dry. Warm (max 22°C on Fri afternoon, min 13°C on Sat morning). Wind will be generally light. | ||||||||||||||||||||
Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | |||||||||||||||
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 12 | SSW 12 | SW 22 | 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 14 | WSW 13 | WSW 13 | WSW 13 | WSW 12 |
Wave Graph | |||||||||||||||||||||
1102 | 705 | 1641 | 1798 | 1741 | 1899 | 2719 | 2058 | 1412 | 987 | 974 | 876 | 863 | 793 | 743 | 892 | 1230 | 1848 | 1643 | 1188 | 715 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross | cross-on | cross | cross-off | cross-on | cross-off | glassy | cross-off | off | cross-on | cross-on | cross-off | cross-off | cross | cross | cross-off | cross-off | off |
High Tide | 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 | 5:55AM1.37m | 6:12PM1.47m | ||||||||
Low Tide | 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 | 11:56AM0.26m | 00:31AM0.33m | |||||||
7:26 | — | — | 7:26 | — | — | 7:24 | — | — | 7:24 | — | — | 7:22 | — | — | 7:22 | — | — | 7:20 | — | — | |
— | 6:08 | — | — | 6:09 | — | — | 6:10 | — | — | 6:10 | — | — | 6:12 | — | — | 6:13 | — | — | 6:13 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 16 | 13 | 14 | 19 | 15 | 20 | 25 | 22 | 21 | 22 | 17 | 16 | 19 | 15 | 16 | 18 | 14 | 17 | 18 | 15 |
Feels °C | 7 | 8 | 5 | 8 | 15 | 10 | 17 | 23 | 20 | 18 | 18 | 15 | 15 | 17 | 15 | 14 | 17 | 13 | 15 | 15 | 14 |
Swell 1 Height (m) Direction Period (s) | SSW 12 | SSW 12 | SW 22 | 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 14 | WSW 13 | WSW 13 | WSW 13 | WSW 12 |
1102 | 705 | 1641 | 1798 | 1741 | 1899 | 2719 | 2058 | 1412 | 987 | 974 | 876 | 863 | 793 | 743 | 892 | 1230 | 1848 | 1643 | 1188 | 715 | |
Swell 2 Height (m) Direction Period (s) | SW 26 | SW 24 | SW 11 | SW 10 | SW 10 | SW 22 | ESE 11 | SE 12 | SE 10 | SE 11 | ESE 11 | W 6 | W 6 | WSW 6 | WSW 7 | ESE 9 | ESE 11 | ESE 12 | ESE 11 | ESE 11 | E 11 |
27 | 287 | 278 | 108 | 67 | 653 | 113 | 84 | 37 | 43 | 12 | 21 | 17 | 10 | 26 | 29 | 23 | 26 | 23 | 23 | 21 | |
Swell 3 Height (m) Direction Period (s) | W 16 | WSW 10 | — | SE 9 | S 10 | SE 10 | — | — | — | — | — | WSW 18 | E 9 | E 9 | E 9 | — | — | — | — | — | — |
5 | 10 | — | 36 | 17 | 108 | — | — | — | — | — | 106 | 41 | 41 | 43 | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | ESE 4 | ESE 5 | SSE 11 | E 4 | ESE 9 | E 4 | — | — | — | — | W 5 | WNW 5 | — | — | — | WNW 4 | W 5 | — | — | W 5 | WSW 8 |
27 | 63 | 622 | 33 | 113 | 17 | — | — | — | — | 55 | 23 | — | — | — | 15 | 29 | — | — | 50 | 218 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 38 | 45 | 35 | 38 | 10 | 10 | 0 | 4 | 0 | 0 | 0 | 0 | 4 | 4 | 0 | 0 | 32 | 10 | 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.











