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, 11AM (local time) - 8ft (2.5m), 18s period, SSW swell with 4,423 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 6s. 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 18s and forecast to arrive on Sunday (Sep 06) at 11AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.3m 7s period and expected on Sunday (Sep 06) at 11AM.
| 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 | 11AM (Sun 6th Sep) | 8ft (2.5m) 18s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s on the cards for Onrus.
The next week and a half is a real mixed bag, with a lot of wind-ruined sessions and a few windows that’ll be worth the wait. The first few days are a write-off; strong cross-onshore winds and messy conditions mean you’re better off staying on the beach. But hang in there, because there’s a couple of proper standouts coming.
The first real light at the end of the tunnel is Monday, 7th September. The morning kicks off with a clean 6ft SW groundswell (period 14 seconds) and light cross-offshore winds – that’s a solid combo for a reef setup. The combined energy is moderate to strong (1356). Then Monday afternoon turns absolutely glassy, with the same 6ft SW swell and no wind. That’s the pick of the first week, no question. It’s a bit punchy for beginners, but for an intermediate surfer, that’s a dream session.
After that, Tuesday and Wednesday drop off in size and quality, so don’t expect much.
Now, looking further ahead, the real standout pops up on Wednesday morning, 16th September. We’ve got a 5ft SW groundswell with a very long period of 17 seconds, and the wind is offshore and clean. The combined energy is strong (2539). That long period means the waves will have heaps of energy and shape, but at a reef break like Onrus, it should line up beautifully. This is the one to circle on the calendar – excellent conditions for experienced surfers.
The following Friday morning, 18th September, is another head-turner, but for a different reason. The swell jumps to 13ft from the SW (period 14 seconds) with glassy conditions. Combined energy is massive (5930). That’s a serious, heavy swell. This is expert territory only – way too big for most. If you’re not a seasoned charger, give it a miss. The afternoon stays big at 12ft but picks up a light cross-onshore breeze, still a beast.
Water temp at Onrus is sitting around 59°F, which is about 1°F cooler than normal for this time of year – not a huge anomaly, just a bit fresh.
The first few days have no surf worth mentioning, and the final days of the outlook taper off into marginal conditions. The two clear standouts are Monday 7th September afternoon (glassy, solid 6ft) and Wednesday 16th September morning (offshore, long-period 5ft).
Rusty
Short Range ForecastMostly dry. Warm (max 24°C on Sun afternoon, min 12°C on Fri night). Winds decreasing (strong winds from the ESE on Fri afternoon, light winds from the NE by Sun night). | Days 4-6 Weather SummaryMostly dry. Warm (max 24°C on Mon morning, min 15°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | |||||||||||||||
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) | S 9 | SSE 8 | SE 7 | S 10 | SSW 10 | SW 21 | SSW 18 | SW 16 | SW 15 | SW 14 | SW 13 | SSW 12 | SW 12 | WSW 12 | SW 11 | SW 13 | WSW 13 | SW 12 | SW 14 | WSW 14 | SW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 573 | 597 | 217 | 307 | 218 | 2113 | 4423 | 2113 | 1413 | 1299 | 1069 | 387 | 448 | 106 | 164 | 380 | 286 | 325 | 1814 | 2313 | 2483 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-off | glassy | glassy | glassy | cross-on | glassy | cross | cross-on | cross-on | cross-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 | 1:53PM0.55m | 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 | ||||||||
 | |  | | | | | | | | | | | | |  | |  | | | | |
 | 6:58 | — | — | 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 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 17 | 13 | 16 | 19 | 14 | 18 | 24 | 19 | 24 | 24 | 21 | 21 | 23 | 22 | 19 | 19 | 15 | 18 | 17 | 15 |
Feels °C | 7 | 8 | 4 | 8 | 11 | 7 | 12 | 20 | 17 | 23 | 24 | 21 | 21 | 23 | 23 | 19 | 18 | 14 | 17 | 15 | 14 |
Swell 1 Height (m) Direction Period (s) | S 9 | WSW 11 | SSW 9 | S 10 | SSW 10 | SW 21 | SSW 18 | SW 16 | SW 15 | SW 14 | SW 13 | SSW 12 | SW 12 | S 10 | SW 11 | SW 13 | WSW 13 | SW 12 | SW 14 | WSW 14 | SW 14 |
| kJ | 573 | 105 | 86 | 307 | 218 | 2113 | 4423 | 2113 | 1413 | 1299 | 1069 | 387 | 448 | 94 | 142 | 380 | 286 | 325 | 1814 | 2313 | 2483 |
Swell 2 Height (m) Direction Period (s) | WSW 11 | SSW 14 | WSW 11 | WSW 10 | WSW 10 | SSW 10 | S 9 | — | — | SE 7 | ESE 11 | WSW 13 | SW 16 | WSW 12 | SW 14 | ESE 9 | S 8 | SW 17 | ESE 10 | ESE 11 | — |
| kJ | 109 | 18 | 66 | 59 | 38 | 172 | 14 | — | — | 21 | 11 | 317 | 41 | 106 | 164 | 35 | 5 | 103 | 20 | 22 | — |
Swell 3 Height (m) Direction Period (s) | — | — | SSW 13 | SSW 13 | SW 26 | SW 12 | — | — | — | SSE 14 | SSE 13 | ESE 11 | SE 11 | SW 11 | S 9 | SSE 8 | SE 8 | SSE 8 | SSE 9 | — | — |
| kJ | — | — | 55 | 18 | 102 | 40 | — | — | — | 36 | 33 | 11 | 5 | 97 | 40 | 23 | 3 | 6 | 8 | — | — |
Wind waves Height (m) Direction Period (s) | ESE 5 | SSE 8 | SE 7 | E 5 | SE 5 | ESE 5 | ESE 7 | ESE 7 | ESE 6 | — | — | — | — | SE 2 | — | — | SW 3 | — | — | — | S 6 |
| kJ | 77 | 597 | 217 | 61 | 138 | 114 | 512 | 138 | 42 | — | — | — | — | 1 | — | — | 1 | — | — | — | 75 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1525 | 247 | 86 | 86 | 86 | 86 | 35 | 34 | 10 | 0 | 0 | 0 | 0 | 4 | 0 | 66 | 32 | 4 | 23 | 25 | 199 |
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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