Surf Forecasts:
Onrus surf forecast from 4 Sep 2026:
- Best quality surf: Monday 7 Sep, 8AM (local time) - 6ft (1.8m), 14s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 6 Sep, 8AM (local time) - 7.5ft (2.3m), 19s period, SW swell with 3,737 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 8AM (local time) - 6ft (1.8m), 14s 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 Monday (Sep 07) at 8AM. The primary swell is predicted to be 1.8m and 14s period with a secondary swell of 0.6m and 9s. Another secondary swell of 0.5m and 4s is also forecast. 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 2.3m 19s and forecast to arrive on Sunday (Sep 06) at 8AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Sunday (Sep 06) at 5PM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Mon 7th Sep) | 6ft (1.8m) 14s |
| Best Surf | 8AM (Mon 7th Sep) | 6ft (1.8m) 14s |
| Most Powerful | 8AM (Sun 6th Sep) | 7.5ft (2.3m) 19s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Right, folks, Rusty here. Let’s have a look at what’s cookin’ for Onrus.
First thing you gotta know – the water’s sittin’ at 59°, which is about 2° cooler than normal for this time of year. So, nothin’ wild, just a bit of a nip in the air.
Now, I’m not gonna sugarcoat it: the start of this run is a total write-off. We’re talkin’ Friday the 4th through Sunday the 6th – it’s just howlin’ easterly winds, strong cross-onshore, and the surf is blown to bits. Friday afternoon has a messy 7ft SSE swell, but with 31 mph winds, forget it. Saturday and Sunday are the same story – strong breeze, lumpy, no good. You’d be better off stayin’ home.
Alright, Monday the 7th morning. This is where it gets interesting. The wind drops to a dead glassy 3 mph from the west, and we’ve got a solid 6ft SW groundswell with a 14-second period. The combined energy is a strong 1292. This is excellent, clean surf for experienced surfers. The wave will have some serious punch and long sets. Monday afternoon gets a bit of a cross-shore ripple, but still a decent 6ft, so the morning is the clear winner.
Tuesday the 8th looks good too. Morning has a clean 5ft SW swell (12-second period, 548 energy) with a light cross-offshore wind. Afternoon glassies off to 2ft, so that’s a small, clean end-of-day option.
Now, we’ve got a bit of a lull Wednesday the 9th and Thursday the 10th with smaller, weaker swells and iffy winds. Thursday afternoon sees a 5ft SW groundswell (14-second period, 1483 energy) but a moderate cross-onshore chops it up.
Friday the 11th and Saturday the 12th are a mixed bag. Friday is onshore junk. Saturday the 12th is a big one: a 10ft SW groundswell with an 18-second period – that’s 5305 energy! But it’s cross-onshore and just too big for this break. The afternoon is glassy but the swell is 10ft, which is still too big for Onrus.
Sunday the 13th is a bit of a redemption. A fresh offshore wind from the WNW cleans up a 7ft SW groundswell (14-second period, 3139 energy). It’s a marginal call, but for a strong surfer, that’s a fun, powerful wave.
The standout of the whole 16-day window, though, is Monday the 15th of September. Morning session. We’ve got a clean 8ft SW groundswell, 12-second period, with a gentle offshore breeze from the NW. The combined energy is a strong 1493. This is gonna be excellent, powerful, and clean for experienced surfers. The wind is offshore, the size is meaty but not stupid, and the period is good. This is the one to circle on your calendar.
We get a couple more big days after that, but the 16th sees a 10ft SW swell (18-second period, 6512 energy) – just too big again. The 17th is a total washout with 13ft WSW swell and onshore winds. The run ends on Saturday the 19th with a smaller, clean 4ft WSW swell and a fresh offshore wind, a nice way to finish if you’re after a smaller wave.
Overall, a slow start, but a solid week ahead with Monday the 15th being the absolute pick of the bunch.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Mon morning, min 12°C on Fri night). Winds decreasing (strong winds from the ESE on Fri afternoon, light winds from the W by Mon morning). | Days 5-7 Weather SummaryMostly dry. Warm (max 25°C on Mon afternoon, min 14°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Fri 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | ||||||||||||||
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) | SSE 8 | SE 8 | S 10 | SSW 10 | SW 21 | SW 18 | SW 16 | SW 15 | SW 14 | SW 13 | SSW 12 | SW 12 | WSW 12 | SW 14 | WSW 13 | WSW 13 | SW 12 | WSW 12 | SW 14 | SW 13 |
Wave Graph  | ||||||||||||||||||||
 kJ | 597 | 223 | 314 | 218 | 2758 | 3523 | 2113 | 1413 | 1203 | 1083 | 355 | 505 | 106 | 167 | 304 | 290 | 336 | 588 | 1094 | 1589 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | glassy | cross | cross | cross-off | glassy | glassy | cross | cross-off | glassy | on | cross-on | on |
High Tide | 8:28PM1.19m | 9:44AM1.06m | 10:28PM1.15m | 11:40AM1.14m | 00:06AM1.23m | 12:49PM1.30m | 1:08AM1.36m | 1:37PM1.47m | 1:55AM1.47m | 2:17PM1.61m | 2:35AM1.55m | 2:53PM1.70m | 3:11AM1.59m | |||||||
Low Tide | 3:13AM0.54m | 3:56PM0.62m | 5:16AM0.51m | 5:56PM0.53m | 6:34AM0.38m | 7:05PM0.37m | 7:26AM0.25m | 7:53PM0.22m | 8:07AM0.13m | 8:34PM0.10m | 8:44AM0.06m | 9:11PM0.03m | ||||||||
 |  | | | |  | | | | | | | | | | | | | |  | |
 | — | — | 6:56 | — | — | 6:56 | — | — | 6:54 | — | — | 6:52 | — | — | 6:52 | — | — | 6:50 | — | — |
 | 6:25 | — | — | 6:27 | — | — | 6:28 | — | — | 6:28 | — | — | 6:29 | — | — | 6:30 | — | — | 6:30 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 17 | 14 | 16 | 19 | 15 | 17 | 22 | 17 | 25 | 25 | 22 | 22 | 23 | 19 | 19 | 19 | 15 | 17 | 18 | 15 |
Feels °C | 8 | 5 | 7 | 11 | 8 | 10 | 16 | 15 | 24 | 24 | 21 | 22 | 22 | 20 | 19 | 18 | 15 | 16 | 16 | 14 |
Swell 1 Height (m) Direction Period (s) | WSW 11 | SSW 9 | S 10 | SSW 10 | SW 21 | SW 18 | SW 16 | SW 15 | SW 14 | SW 13 | SSW 12 | SW 12 | S 10 | SW 11 | WSW 13 | WSW 13 | SW 12 | WSW 12 | SW 14 | SW 13 |
| kJ | 105 | 84 | 314 | 218 | 2758 | 3523 | 2113 | 1413 | 1203 | 1083 | 355 | 505 | 94 | 121 | 304 | 290 | 336 | 518 | 1094 | 1589 |
Swell 2 Height (m) Direction Period (s) | SSW 14 | WSW 11 | WSW 10 | WSW 10 | SSW 10 | S 9 | — | SE 7 | SE 9 | ESE 10 | WSW 13 | SW 17 | WSW 12 | SW 14 | SSE 9 | SSE 10 | SSE 9 | SW 15 | WSW 11 | W 12 |
| kJ | 18 | 66 | 59 | 38 | 188 | 13 | — | 28 | 52 | 9 | 330 | 43 | 106 | 167 | 28 | 18 | 15 | 588 | 389 | 26 |
Swell 3 Height (m) Direction Period (s) | — | SSW 13 | SSW 13 | SW 26 | SW 13 | — | — | — | SSE 14 | S 13 | SW 18 | ESE 9 | SW 11 | S 9 | SSW 8 | S 8 | SE 10 | ESE 10 | — | E 11 |
| kJ | — | 55 | 18 | 104 | 41 | — | — | — | 37 | 84 | 13 | 66 | 76 | 57 | 6 | 5 | 25 | 18 | — | 9 |
Wind waves Height (m) Direction Period (s) | SSE 8 | SE 8 | E 5 | SE 5 | SSE 9 | ESE 6 | ESE 6 | E 4 | — | — | — | — | — | — | — | — | — | — | — | S 6 |
| kJ | 597 | 223 | 61 | 119 | 480 | 156 | 175 | 20 | — | — | — | — | — | — | — | — | — | — | — | 25 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 247 | 86 | 86 | 86 | 86 | 38 | 38 | 10 | 0 | 32 | 4 | 0 | 0 | 0 | 66 | 0 | 0 | 4 | 272 | 10 |
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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