Surf Forecasts:
Onrus surf forecast from 13 Aug 2026:
- Best quality surf: Thursday 13 Aug, 11AM (local time) - 7ft (2.1m), 17s period, SW swell with cross-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 with a secondary swell of 0.6m and 11s. 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 5s period and expected on Friday (Aug 14) at 5PM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Thu 13th Aug) | 7ft (2.1m) 17s |
| Best Surf | 11AM (Thu 13th Aug) | 7ft (2.1m) 17s |
| Most Powerful | 11AM (Thu 13th Aug) | 7ft (2.1m) 17s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Alright, let’s talk feet and degrees for the metric-averse. Onrus is the only spot on the menu, a reef break that can fire. Water temp is sitting at 58°F, which is a touch colder than average for August.
It’s a bit of a slow burn. Thursday morning (August 13th) hits with 7ft of SW swell, a very long 17-second groundswell. The ocean’s got some serious mojo with a combined energy of 2818. Wind is cross-off from the NNE at 9 mph, so it stays clean, but it’s a big, powerful wave for experienced folks only.
Friday morning (August 14th) is the pick of the first few days. A clean offshore breeze from the NW at 9 mph polishes up a 5ft WSW swell. Still a long 15-second period, but the smaller size and clean faces are what you want. Energy is moderate at 1005.
Monday morning (August 17th) looks like the week’s best. Dead calm, glassy conditions with an E wind at 3 mph. The swell is back up to 8ft from the WSW at a 13-second period. Moderate energy at 1756, but those clean conditions on a bigger swell are the highlight. Not for the faint-hearted.
From Wednesday (August 19th) through Monday (August 24th), it’s a total loss. Strong cross-onshore winds from the ESE and E pick up, hitting 31 mph and making the ocean choppy and ugly. That’s a gap of nearly a week with nothing to get excited about.
A smaller, cleaner pulse arrives on the 25th. Tuesday morning (August 25th) has 4ft of swell with glassy WNW winds at 3 mph. Weak energy at 435, so a longboard morning.
The long-range window of promise is Thursday afternoon (August 27th). An offshore breeze from the W at 9 mph should clean up a 5ft WSW swell with moderate energy (1204). It’s a long way out, but it’s the last whisper of a clean south-west swell on the charts.
Rusty.
Short Range ForecastMostly dry. Warm (max 24°C on Thu afternoon, min 13°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Tue night. Very mild (max 19°C on Sun afternoon, min 12°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | |||||||||||||||
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) | SW 17 | SW 16 | SW 16 | WSW 15 | WSW 15 | WSW 14 | WSW 13 | WSW 13 | WSW 14 | WSW 14 | WSW 15 | WSW 14 | WSW 13 | WSW 13 | WSW 13 | WSW 12 | WSW 12 | SW 11 | SW 11 | SW 11 | SSW 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2719 | 2058 | 1513 | 987 | 974 | 889 | 863 | 781 | 947 | 1043 | 1145 | 2087 | 1756 | 1487 | 1342 | 984 | 614 | 1204 | 1053 | 1008 | 890 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-off | off | cross-off | cross-off | cross-on | glassy | cross-off | cross-off | cross-off | off | glassy | cross-on | cross-off | cross-off | cross-off | on | cross-on | cross-on | cross-on |
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 | 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 | 12:28PM0.39m | 1:06AM0.45m | 1:02PM0.53m | 1:50AM0.57m | |||||||
 | |  | |  | | | |  | | | | | | | | |  |  | | | |
 | 7:24 | — | — | 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 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — |
Temp °C | 21 | 24 | 22 | 20 | 19 | 15 | 16 | 20 | 18 | 17 | 19 | 17 | 17 | 18 | 15 | 16 | 17 | 14 | 12 | 13 | 13 |
Feels °C | 18 | 22 | 20 | 16 | 15 | 14 | 15 | 19 | 18 | 14 | 14 | 14 | 16 | 16 | 15 | 13 | 13 | 13 | 7 | 7 | 7 |
Swell 1 Height (m) Direction Period (s) | SW 17 | SW 16 | SW 16 | WSW 15 | WSW 15 | WSW 14 | WSW 13 | WSW 13 | WSW 14 | WSW 14 | WSW 15 | WSW 14 | WSW 13 | WSW 13 | WSW 13 | WSW 12 | WSW 12 | SW 11 | SW 11 | SW 11 | SSW 11 |
| kJ | 2719 | 2058 | 1513 | 987 | 974 | 889 | 863 | 781 | 947 | 1043 | 1145 | 2087 | 1756 | 1487 | 1342 | 984 | 614 | 1204 | 1053 | 1008 | 890 |
Swell 2 Height (m) Direction Period (s) | SE 11 | SE 10 | ESE 10 | SE 11 | ESE 10 | W 6 | W 6 | WSW 8 | ESE 8 | ESE 9 | ESE 8 | — | ESE 10 | ESE 10 | SW 14 | SW 12 | SW 12 | E 10 | E 10 | E 10 | — |
| kJ | 99 | 38 | 172 | 18 | 98 | 16 | 17 | 55 | 24 | 15 | 12 | — | 19 | 19 | 149 | 256 | 281 | 8 | 2 | 2 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | E 9 | ESE 9 | — | — | — | — | — | — | — | E 11 | E 11 | E 10 | — | — | — | — |
| kJ | — | — | — | — | — | 42 | 25 | — | — | — | — | — | — | — | 21 | 9 | 9 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | W 4 | W 5 | — | — | ESE 3 | — | WNW 4 | W 4 | — | — | — | — | W 4 | — | — | — | — | SSE 6 |
| kJ | — | — | — | 9 | 73 | — | — | 12 | — | 17 | 16 | — | — | — | — | 10 | — | — | — | — | 154 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 4 | 0 | 0 | 31 | 0 | 10 | 0 | 0 | 31 | 50 | 0 | 0 | 25 | 0 | 50 | 67 | 23 | 40 | 91 | 23 |
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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