
Surf Forecasts:
Onrus surf forecast from 10 Aug 2026:
- Best quality surf: Monday 10 Aug, 5AM (local time) - 10ft (3.0m), 11s period, SSW swell with onshore winds.
- Most powerful swell: Monday 17 Aug, 2AM (local time) - 8ft (2.5m), 16s period, WSW swell with 3,639 kJ wave energy.
- Next surfable swell (1★+): Monday 10 Aug, 5AM (local time) - 10ft (3.0m), 11s period with SSW 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 Monday (Aug 10) at 5AM. The primary swell is predicted to be 3.0m and 11s period with a secondary swell of 2.5m and 11s. The wind is predicted to be onshore as the swell arrives.
The most powerful waves expected at Onrus in the next 16 days are 2.5m 16s and forecast to arrive on Monday (Aug 17) at 2AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 10s period and expected on Thursday (Aug 13) at 11AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Mon 10th Aug) | 10ft (3.0m) 11s |
| Best Surf | 5AM (Mon 10th Aug) | 10ft (3.0m) 11s |
| Most Powerful | 2AM (Mon 17th Aug) | 8ft (2.5m) 16s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Alright, let’s get into it. This is Rusty, and we’re looking at a real mixed bag for Onrus over the next couple of weeks. The first few days are pretty much a write-off, but there’s some real promise later on if you can be patient.
The pattern starts rough. From Monday the 10th right through to Friday the 14th, it’s mostly onshore or cross-onshore winds with moderate to strong breezes, and the surf is just messy. Swell heights are around 5 ft to 8 ft, but the wind is just trashing it. The combined wave energy is high – 2242 to 2830 (moderate to strong) – but the quality is poor. Not worth paddling out unless you’re desperate for a battle.
Things start to turn on Saturday the 15th. The wind swings offshore from the WNW, and the surf cleans right up. Swell drops to a clean 5 ft from the WSW with a period of 14 seconds, and combined energy is 876 (moderate). This is where we start seeing some real potential.
The standout window, and the best bet in this whole outlook, is Sunday the 16th morning. We’ve got a clean 6 ft WSW groundswell, period of 14 seconds, and cross-offshore WNW winds at 9 mph. Combined energy is 1130 (moderate). This is going to be clean, lined-up, and just about perfect for an intermediate. The water temperature is about average for this time of year, so no surprises there.
After that, Monday the 17th and Tuesday the 18th morning get glassy. On Tuesday the 18th, we’ve got a glassy morning with 6 ft from the WSW and a 12-second period. Combined energy is 1052 (moderate). The wind is dead calm – glassy conditions. That’s a major positive. But the swell is pushing 7 ft, so it’s getting a bit punchy for beginners.
The absolute highlight, though, is Saturday the 22nd morning. We get a clean 7 ft SW groundswell with an 11-second period, light cross-offshore wind from the WNW at 6 mph. Combined energy is 1183 (moderate). This is an excellent window for experienced surfers. The reef at Onrus handles long-period swells well, and this is going to offer some proper, well-shaped waves.
Now, a couple of warnings. On Friday the 21st afternoon, the swell jumps to 10 ft from the WSW with a period of 12 seconds. That’s too big for this break – only for experts. Same thing on Sunday the 23rd, with a 10 ft to 12 ft SSW swell and a very long 15-16 second period. Combined energy hits 5109 and 5798 (very strong). That’s massive and dangerous. Give it a miss unless you’re a local charger.
Later, on Tuesday the 25th morning, we get a glassy, clean 5 ft SSW swell with a 12-second period. Combined energy is 767 (weak to moderate). It’s a nice, mellow end to the run.
Overall, don’t bother with the first week. The best days are Sunday the 16th morning, Tuesday the 18th morning, and Saturday the 22nd morning. Of those, Saturday the 22nd is the standout. Crowds are possible at Onrus, but with this quality, expect a few locals out. It’s inconsistent, so the wait between sets will be worth it.
Rusty
Short Range ForecastMostly dry. Warm (max 20°C on Wed afternoon, min 9°C on Tue night). Winds decreasing (fresh winds from the E on Tue afternoon, light winds from the E by Wed afternoon). | Days 5-7 Weather SummaryMostly dry. Warm (max 25°C on Thu afternoon, min 16°C on Wed night). Wind will be generally light. | ||||||||||||||||||
Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | ||||||||||||||
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 | SSW 11 | S 10 | SSW 13 | SSW 12 | SSW 12 | SW 22 | SW 18 | SW 18 | SW 16 | SW 18 | SW 17 | SW 16 | WSW 15 | WSW 15 | WSW 14 | WSW 14 | WSW 13 | WSW 13 |
Wave Graph | |||||||||||||||||||
1921 | 1410 | 1201 | 2116 | 1102 | 625 | 1641 | 1778 | 1741 | 2003 | 2912 | 2535 | 1571 | 1117 | 1087 | 929 | 876 | 837 | 817 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross | cross | cross | cross-off | cross | cross-on | cross-off | cross-off | cross-off | cross-off |
High Tide | 1:08AM1.39m | 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 | |||||||
Low Tide | 7:35AM0.23m | 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 | |||||||
— | 7:28 | — | — | 7:26 | — | — | 7:26 | — | — | 7:24 | — | — | 7:24 | — | — | 7:22 | — | — | |
6:07 | — | 6:07 | — | — | 6:08 | — | — | 6:09 | — | — | 6:10 | — | — | 6:10 | — | — | 6:12 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 12 | 13 | 14 | 11 | 13 | 15 | 11 | 14 | 20 | 17 | 21 | 25 | 23 | 23 | 24 | 22 | 22 | 23 | 16 |
Feels °C | 5 | 7 | 7 | 5 | 6 | 7 | 3 | 9 | 17 | 12 | 17 | 24 | 20 | 22 | 22 | 19 | 19 | 20 | 16 |
Swell 1 Height (m) Direction Period (s) | SSW 11 | SSW 11 | S 10 | SSW 13 | SSW 12 | SSW 12 | SW 22 | SW 18 | SW 18 | SW 16 | SW 18 | SW 17 | SW 16 | WSW 15 | WSW 15 | WSW 14 | WSW 14 | WSW 13 | WSW 13 |
1921 | 1410 | 753 | 2116 | 1102 | 625 | 1641 | 1778 | 1741 | 2003 | 2912 | 2535 | 1571 | 1117 | 1087 | 929 | 876 | 837 | 817 | |
Swell 2 Height (m) Direction Period (s) | — | S 14 | SW 11 | WSW 11 | SW 26 | SW 24 | SSW 11 | SW 10 | SW 10 | SW 22 | ESE 10 | SE 11 | SE 10 | SE 11 | SE 11 | ESE 9 | ESE 9 | ESE 9 | E 9 |
— | 93 | 347 | 103 | 27 | 287 | 247 | 108 | 65 | 453 | 603 | 58 | 58 | 45 | 20 | 88 | 45 | 44 | 42 | |
Swell 3 Height (m) Direction Period (s) | — | — | SSW 14 | — | W 16 | WSW 10 | — | S 10 | S 10 | SE 10 | — | — | — | WNW 4 | — | — | — | — | — |
— | — | 529 | — | 5 | 10 | — | 28 | 17 | 63 | — | — | — | 8 | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | SSE 8 | S 9 | S 10 | E 3 | E 4 | ESE 4 | ESE 8 | ESE 9 | ESE 4 | ENE 3 | ESE 11 | — | — | — | — | — | WNW 3 | — | — |
285 | 739 | 1201 | 8 | 18 | 44 | 223 | 101 | 22 | 9 | 123 | — | — | — | — | — | 4 | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 247 | 220 | 220 | 23 | 38 | 38 | 40 | 10 | 23 | 10 | 10 | 10 | 0 | 4 | 23 | 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.











