Surf Forecasts:
Onrus surf forecast from 14 Sep 2026:
- Best quality surf: Wednesday 16 Sep, 2AM (local time) - 10ft (3.0m), 14s period, WSW swell with cross-shore winds.
- Most powerful swell: Wednesday 16 Sep, 2AM (local time) - 10ft (3.0m), 14s period, WSW swell with 3,302 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 8AM (local time) - 4ft (1.2m), 13s 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 14) at 8AM. The primary swell is predicted to be 1.2m and 13s period with a secondary swell of 0.6m and 11s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Onrus in the next 16 days are 3.0m 14s and forecast to arrive on Wednesday (Sep 16) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Tuesday (Sep 15) at 11AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Mon 14th Sep) | 4ft (1.2m) 13s |
| Best Surf | 2AM (Wed 16th Sep) | 10ft (3.0m) 14s |
| Most Powerful | 2AM (Wed 16th Sep) | 10ft (3.0m) 14s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Alright, let’s be honest about this forecast—it’s a mixed bag, but there’s one clear winner.
Your best window is the afternoon of Tuesday, September 29th. That’s the day. Onrus (Western Cape) is a reef, and it’s inconsistent, so you’ll be sitting out there waiting, but the payoff is there. The swell is 1.1m from the southwest at 12 seconds, and the energy is moderate at 522. The wind drops to almost nothing, and it goes glassy—dead clean. The water is 58°F, a bit colder than usual for this time of year, so bring the rubber.
Before that, it’s rough. Monday the 14th has some fun in the morning—1.1m SW with a light offshore NW wind, clean but only moderate energy at 420. The water temperature is 58°F, which is slightly below average. But that’s the best of the first week. The wind goes strong offshore on Tuesday the 15th, making it a paddle fight, and then the swell builds Wednesday with 2.2m from the SW, but the SE wind turns onshore and it just gets messy. Energy readings are strong—over 2000—but it’s blown out. That run of poor conditions carries through.
There’s a big gap of junk days from Wednesday the 16th all the way to Monday the 21st, where things are marginal at best. The 21st has light winds but it’s cross-onshore, so it’s lumpy. Nothing worth getting excited about.
So, the standout is clearly the afternoon of the 29th. It’s small, clean, and glassy. Perfect conditions for a reef like Onrus, even if it’s inconsistent. That’s the one to circle on the calendar. Everything else, you’re better off waiting.
Rusty.
Short Range ForecastHeavy rain (total 21mm), heaviest during Tue night. Warm (max 20°C on Mon afternoon, min 12°C on Tue night). Winds decreasing (strong winds from the NW on Tue afternoon, light winds from the S by Tue night). | Days 4-6 Weather SummarySome drizzle, heaviest during Sat night. Very mild (max 17°C on Fri morning, min 12°C on Thu night). Winds decreasing (strong winds from the ESE on Fri afternoon, moderate winds from the SE by Sat night). | ||||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | |||||||||||||||
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 12 | SW 12 | SW 12 | SW 11 | SW 16 | WSW 14 | SW 14 | SW 13 | SW 13 | SW 12 | SW 12 | SW 11 | SW 11 | SW 13 | SW 13 | SW 12 | SW 12 | SW 13 | SW 13 | SW 13 | WSW 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 374 | 268 | 190 | 168 | 803 | 3302 | 1049 | 1657 | 2422 | 1829 | 1213 | 626 | 579 | 892 | 865 | 712 | 355 | 543 | 859 | 816 | 554 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | off | off | cross | on | on | on | on | on | on | on | cross-on | on | cross-on | on | on | on | on | cross |
High Tide | 4:59PM1.58m | 5:18AM1.40m | 5:29PM1.45m | 5:48AM1.29m | 5:59PM1.31m | 6:20AM1.17m | 6:32PM1.17m | 7:03AM1.04m | 7:21PM1.04m | 8:35AM0.94m | 9:27PM0.96m | 11:23AM0.98m | 11:40PM1.02m | ||||||||
Low Tide | 10:49AM0.17m | 11:15PM0.19m | 11:18AM0.28m | 11:43PM0.30m | 11:46AM0.40m | 00:13AM0.43m | 12:16PM0.52m | 00:49AM0.55m | 12:56PM0.65m | 1:53AM0.67m | 2:37PM0.76m | 4:44AM0.69m | 5:48PM0.72m | ||||||||
 | |  |  | |  |  |  | | | |  | | | | | |  | | | | |
 | 6:45 | — | — | 6:43 | — | — | 6:41 | — | — | 6:39 | — | — | 6:39 | — | — | 6:37 | — | — | 6:35 | — | — |
 | — | 6:32 | — | — | 6:34 | — | — | 6:35 | — | — | 6:35 | — | — | 6:36 | — | — | 6:37 | — | — | 6:37 | — |
mm | — | — | — | — | — | 20 | 1 | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — |
Temp °C | 18 | 20 | 17 | 17 | 19 | 16 | 15 | 15 | 13 | 14 | 15 | 14 | 17 | 17 | 16 | 17 | 17 | 16 | 16 | 17 | 16 |
Feels °C | 14 | 15 | 15 | 10 | 10 | 8 | 9 | 9 | 7 | 7 | 8 | 8 | 8 | 7 | 9 | 10 | 12 | 11 | 14 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | SW 12 | SW 12 | SW 12 | SW 11 | SW 16 | WSW 14 | SW 9 | SW 13 | SW 13 | SW 12 | SW 12 | SW 11 | SW 11 | SW 13 | SW 13 | SW 12 | SW 12 | SW 13 | SW 13 | SW 13 | WSW 12 |
| kJ | 374 | 268 | 190 | 168 | 803 | 3302 | 595 | 1657 | 2422 | 1829 | 1213 | 626 | 579 | 892 | 865 | 712 | 355 | 543 | 859 | 816 | 554 |
Swell 2 Height (m) Direction Period (s) | SE 11 | SE 12 | ESE 13 | SW 18 | E 11 | ESE 11 | SW 14 | SW 13 | WSW 12 | — | — | S 10 | S 9 | S 8 | S 8 | — | SW 14 | SW 18 | ESE 10 | ESE 12 | SSE 5 |
| kJ | 46 | 36 | 16 | 109 | 62 | 42 | 1049 | 529 | 49 | — | — | 154 | 15 | 21 | 1 | — | 289 | 50 | 60 | 15 | 26 |
Swell 3 Height (m) Direction Period (s) | — | — | — | SE 13 | — | — | WSW 13 | E 11 | — | — | — | — | — | — | — | — | — | — | — | — | WSW 15 |
| kJ | — | — | — | 7 | — | — | 249 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | 146 |
Wind waves Height (m) Direction Period (s) | WNW 5 | WNW 6 | WNW 7 | WNW 6 | WNW 7 | — | — | ESE 11 | SE 6 | SE 6 | SE 5 | SSE 10 | SE 6 | SE 6 | SE 5 | SE 6 | SE 6 | SSE 6 | SSE 6 | SSE 6 | — |
| kJ | 35 | 126 | 86 | 172 | 586 | — | — | 22 | 223 | 146 | 46 | 295 | 119 | 175 | 126 | 141 | 102 | 68 | 74 | 67 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 92 | 0 | 103 | 155 | 38 | 272 | 245 | 40 | 220 | 335 | 335 | 1196 | 1182 | 1121 | 89 | 335 | 245 | 389 | 532 | 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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