Surf Forecasts:
Onrus surf forecast from 15 Aug 2026:
- Best quality surf: Monday 17 Aug, 2AM (local time) - 10ft (3.0m), 14s period, WSW swell with cross-offshore winds.
- Most powerful swell: Monday 17 Aug, 2AM (local time) - 10ft (3.0m), 14s period, WSW swell with 2,830 kJ wave energy.
- Next surfable swell (1★+): Saturday 15 Aug, 5PM (local time) - 5ft (1.6m), 13s 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 Saturday (Aug 15) at 5PM. The primary swell is predicted to be 1.6m and 13s period with a secondary swell of 0.9m and 9s. The wind is predicted to be glassy 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 Monday (Aug 17) at 2AM. 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 5s period and expected on Sunday (Aug 16) at 5PM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Sat 15th Aug) | 5ft (1.6m) 13s |
| Best Surf | 2AM (Mon 17th Aug) | 10ft (3.0m) 14s |
| Most Powerful | 2AM (Mon 17th Aug) | 10ft (3.0m) 14s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Alright, Rusty here, checking in. We've got a solid run of surf on the cards for the Onrus reef, but you'll need to pick your moments. The water is a bit nippier than usual for this time of year, sitting at 57°, so a thicker wetsuit is the call.
We kick off this Saturday morning, the 15th of August. It's small but clean, with a 5ft WSW swell and glassy conditions. The wave energy is moderate (781). Not a standout, but a nice gentle start to the weekend.
Sunday the 16th is where it starts to get interesting. The morning brings a clean 6ft WSW swell with a nice offshore wind. The wave energy is climbing (1190). That's a proper session for the confident intermediate.
Monday the 17th is the first real standout. The swell pushes up to 8ft from the WSW, with a solid 13-second period. The winds are cross-off, keeping it clean. The energy is strong (2084). This is excellent for experienced surfers, but it's getting too big for beginners. The afternoon stays similar at 8ft, also excellent.
Tuesday the 18th sees the cross-onshore wind ruin the party. The swell is still there at 8ft, but the surface is choppy. It's a write-off.
Wednesday the 19th is a tale of two halves. The morning is average with a cross-onshore breeze, but by the afternoon, it goes glassy again. The swell is a solid 8ft from the SW, and the conditions are clean. That afternoon session is a gem.
Thursday the 20th morning is another glassy window with a 7ft SW swell. It's clean and inviting. The afternoon turns cross-onshore and choppy, so get out early.
Friday the 21st is a full day of good waves. The morning is glassy with a 7ft SW swell, and the afternoon is clean with a cross-off breeze. The energy is moderate (1134 & 1075). This is a great, consistent day.
The following week has some promise, but the conditions get trickier. The weekend of the 22nd and 23rd is mostly blown out by strong winds. There's a solid window on Tuesday the 25th afternoon with a clean 6ft SW swell, and then the big one.
The real standout of the entire 16-day window is Wednesday the 26th of August. The morning delivers a 8ft SW swell with a very long 16-second period, clean with a cross-off breeze. The wave energy is very strong (3116). This is a powerful, high-quality groundswell. That long period will make it break beautifully on the reef, but it's for experts only. The afternoon is still solid but the wind picks up.
The last few days, from the 27th to the 30th, offer a mix of clean and marginal conditions, with smaller swells around 6ft to 8ft, perfect for the intermediate crew if you pick the right tide and wind.
Remember, this is an inconsistent spot, so when it's on, it's on. Don't sleep on that Wednesday the 26th.
Rusty.
Short Range ForecastMostly dry. Very mild (max 19°C on Sun afternoon, min 13°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 16°C on Tue afternoon, min 10°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Sat 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | ||||||||||||||
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) | WSW 13 | WSW 13 | WSW 13 | WSW 14 | WSW 14 | WSW 13 | WSW 13 | WSW 13 | SW 12 | SW 13 | SW 12 | SW 12 | SW 12 | SW 12 | SW 12 | SW 13 | SW 13 | SW 12 | SW 12 | SW 11 |
Wave Graph  | ||||||||||||||||||||
 kJ | 812 | 1243 | 1074 | 1525 | 2830 | 2149 | 1783 | 1575 | 1572 | 1982 | 1897 | 1451 | 1336 | 1130 | 1427 | 2204 | 2107 | 1223 | 913 | 676 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | on | cross-on | glassy | cross-on | cross | glassy | on | cross-on | cross-on | cross | off |
High Tide | 5:06PM1.69m | 5:21AM1.47m | 5:39PM1.60m | 5:55AM1.37m | 6:12PM1.47m | 6:30AM1.25m | 6:46PM1.33m | 7:08AM1.13m | 7:25PM1.19m | 7:59AM1.02m | 8:25PM1.07m | 9:40AM0.94m | 10:21PM1.01m | |||||||
Low Tide | 11:23PM0.12m | 11:25AM0.15m | 11:57PM0.21m | 11:56AM0.26m | 00:31AM0.33m | 12:28PM0.39m | 1:06AM0.45m | 1:02PM0.53m | 1:50AM0.57m | 1:50PM0.65m | 3:11AM0.66m | 3:39PM0.74m | ||||||||
 |  | |  | |  | |  | | | | | | | | | | | | | |
 | — | — | 7:22 | — | — | 7:20 | — | — | 7:20 | — | — | 7:18 | — | — | 7:16 | — | — | 7:16 | — | — |
 | 6:12 | — | — | 6:13 | — | — | 6:13 | — | — | 6:14 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 18 | 16 | 17 | 19 | 16 | 17 | 17 | 15 | 15 | 16 | 13 | 15 | 16 | 13 | 15 | 16 | 13 | 15 | 20 | 14 |
Feels °C | 18 | 16 | 14 | 14 | 12 | 16 | 15 | 14 | 14 | 13 | 9 | 14 | 14 | 12 | 15 | 14 | 10 | 12 | 19 | 12 |
Swell 1 Height (m) Direction Period (s) | WSW 13 | WSW 13 | WSW 13 | WSW 14 | WSW 14 | WSW 13 | WSW 13 | WSW 13 | SW 12 | SW 13 | SW 12 | SW 12 | SW 12 | SW 12 | SW 12 | SW 13 | SW 13 | SW 12 | SW 12 | SW 11 |
| kJ | 812 | 1243 | 1074 | 1525 | 2830 | 2149 | 1783 | 1575 | 1572 | 1982 | 1897 | 1451 | 1336 | 1130 | 1427 | 2204 | 2107 | 1223 | 913 | 676 |
Swell 2 Height (m) Direction Period (s) | WSW 9 | ESE 8 | ESE 9 | ESE 12 | — | E 9 | ESE 10 | SW 14 | SW 13 | E 11 | E 10 | E 10 | E 10 | E 10 | — | — | — | — | — | — |
| kJ | 108 | 24 | 16 | 27 | — | 6 | 19 | 434 | 976 | 9 | 8 | 2 | 2 | 2 | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | E 10 | — | — | E 11 | — | E 11 | E 11 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 2 | — | — | 3 | — | 9 | 9 | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | ESE 9 | — | W 4 | W 5 | — | — | — | — | — | — | — | — | — | — | — | — | E 3 | ESE 5 | SE 5 | — |
| kJ | 59 | — | 11 | 65 | — | — | — | — | — | — | — | — | — | — | — | — | 11 | 78 | 51 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 31 | 10 | 0 | 0 | 0 | 10 | 335 | 10 | 10 | 0 | 10 | 0 | 23 | 23 | 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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