Surf Forecasts:
Onrus surf forecast from 13 Aug 2026:
- Best quality surf: Thursday 13 Aug, 8PM (local time) - 6ft (1.9m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Monday 17 Aug, 2AM (local time) - 8ft (2.5m), 14s period, WSW swell with 2,491 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 8PM (local time) - 6ft (1.9m), 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 8PM. The primary swell is predicted to be 1.9m and 16s 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 2.5m 14s and forecast to arrive on Monday (Aug 17) at 2AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Friday (Aug 14) at 5PM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Thu 13th Aug) | 6ft (1.9m) 16s |
| Best Surf | 8PM (Thu 13th Aug) | 6ft (1.9m) 16s |
| Most Powerful | 2AM (Mon 17th Aug) | 8ft (2.5m) 14s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Alright, grab your wettie, let’s talk about what’s coming up for Onrus over the next couple of weeks.
The first real window of quality sneaks in on Thursday the 13th. We’ve got a solid 7ft SW groundswell (2719 energy) pushing through with a 17-second period—that’s proper long-period energy. The morning is looking clean with a cross-off breeze, but this one is for experienced crew only. Water temp is sitting at 58°, which is a bit colder than usual for this time of year, so you’ll want the 4/3. It won’t be the easiest paddle, but the shape on that reef should be rewarding.
By Friday the 14th, the swell has backed off a touch to 5ft, but it’s still WSW and clean under offshore wind in the morning. A solid option if you want something a little more manageable. Saturday and Sunday look weaker and more marginal—lighter winds but less push and quality.
Now, here’s the standout. Monday morning the 17th is absolute gold. Onrus is waking up with 8ft of WSW swell, 13-second period, and glassy conditions. That’s the kind of morning where you paddle out before the wind even thinks about getting up. Combined energy is strong at 1783—this is serious wave moving that reef. Crowds are sometimes around here, so it might get a little busy if the word gets out.
Tuesday the 18th is still rideable but the winds pick up, and by Wednesday the 19th we’ve got onshore winds and messy conditions.
Look ahead to Saturday the 22nd—another highlight on the horizon. Morning session showing 8ft SW swell with a 14-second period and a whopping 3065 energy reading. Clean, light winds, but this one is definitely expert territory. If you’ve got the chops, it’ll be worth the early alarm.
Things go a bit ragged after that through Sunday and Monday, but then Tuesday the 25th and Wednesday the 26th offer more clean windows with 5ft to 5ft SW swell and glassy to light offshore conditions. Consistent, clean, smaller waves for the more relaxed sessions.
A couple of days near the end—Thursday the 27th and Friday the 28th—show some serious size, 10ft SW swell, but the wind is onshore and it’s flagged as too big for this break. That’s for the true big-wave specialists only, or maybe just watching from the rocks.
So overall, the best cards to play are Monday the 17th morning for quality and Saturday the 22nd morning for power. Get on it.
Rusty.
Short Range ForecastMostly dry. Warm (max 24°C on Thu afternoon, min 12°C on Sat morning). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 19°C on Sun afternoon, min 13°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Thu 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | ||||||||||||||
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 16 | SW 16 | WSW 15 | WSW 15 | WSW 14 | WSW 14 | WSW 13 | WSW 14 | WSW 13 | WSW 15 | WSW 14 | WSW 13 | WSW 13 | WSW 13 | SW 13 | SW 12 | SW 12 | SW 12 | SW 12 | SW 11 |
Wave Graph  | ||||||||||||||||||||
 kJ | 2058 | 1412 | 987 | 974 | 791 | 876 | 781 | 1059 | 1028 | 1559 | 2491 | 1930 | 1643 | 1449 | 1369 | 1486 | 1655 | 1200 | 990 | 952 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | off | cross-off | cross-off | cross-on | glassy | off | cross-off | cross-off | off | glassy | cross-on | glassy | cross-off | cross-off | glassy | cross-off | cross-off | cross-off |
High Tide | 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 | 7:08AM1.13m | 7:25PM1.19m | |||||||
Low Tide | 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 | 1:02PM0.53m | 1:50AM0.57m | |||||||
 |  |  | |  | | | | | | |  | | | | | | | | | |
 | — | — | 7:24 | — | — | 7:22 | — | — | 7:22 | — | — | 7:20 | — | — | 7:20 | — | — | 7:18 | — | — |
 | 6:10 | — | — | 6:10 | — | — | 6:12 | — | — | 6:13 | — | — | 6:13 | — | — | 6:14 | — | — | 6:15 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 24 | 22 | 18 | 18 | 14 | 16 | 18 | 17 | 18 | 19 | 17 | 16 | 16 | 15 | 16 | 17 | 14 | 16 | 16 | 14 |
Feels °C | 22 | 20 | 14 | 14 | 12 | 15 | 17 | 17 | 14 | 14 | 14 | 16 | 16 | 15 | 15 | 15 | 14 | 14 | 13 | 13 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 16 | WSW 15 | WSW 15 | WSW 14 | WSW 14 | WSW 13 | WSW 14 | WSW 13 | WSW 15 | WSW 14 | WSW 13 | WSW 13 | WSW 13 | SW 13 | SW 12 | SW 12 | SW 12 | SW 12 | SW 11 |
| kJ | 2058 | 1412 | 987 | 974 | 791 | 876 | 781 | 1059 | 1028 | 1559 | 2491 | 1930 | 1643 | 1449 | 1369 | 1486 | 1655 | 1200 | 990 | 952 |
Swell 2 Height (m) Direction Period (s) | SE 10 | ESE 10 | SE 11 | ESE 10 | W 6 | W 6 | WSW 8 | ESE 9 | ESE 9 | ESE 8 | — | ESE 10 | ESE 10 | E 11 | WSW 12 | WSW 12 | E 10 | E 10 | E 10 | E 10 |
| kJ | 37 | 175 | 18 | 74 | 26 | 19 | 63 | 25 | 16 | 12 | — | 21 | 19 | 9 | 618 | 252 | 8 | 2 | 2 | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | ESE 10 | ESE 9 | — | — | — | — | — | — | — | — | E 11 | E 10 | — | — | — | — |
| kJ | — | — | — | — | 19 | 26 | — | — | — | — | — | — | — | — | 9 | 8 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | WNW 5 | W 6 | WNW 6 | — | ESE 9 | — | WNW 4 | W 5 | — | — | — | — | — | SE 3 | — | — | — | — |
| kJ | — | — | 23 | 121 | 48 | — | 59 | — | 25 | 78 | — | — | — | — | — | 5 | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 4 | 0 | 0 | 31 | 0 | 10 | 0 | 0 | 8 | 31 | 0 | 0 | 25 | 0 | 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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