Surf Forecasts:
Onrus surf forecast from 1 Sep 2026:
- Best quality surf: Tuesday 1 Sep, 2PM (local time) - 10ft (3.0m), 13s period, SW swell with cross-offshore winds.
- Most powerful swell: Tuesday 1 Sep, 8PM (local time) - 10ft (3.0m), 13s period, SW swell with 3,567 kJ wave energy.
- Next surfable swell (1★+): Tuesday 1 Sep, 11AM (local time) - 8ft (2.5m), 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 Tuesday (Sep 01) at 11AM. The primary swell is predicted to be 2.5m and 13s period. 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 3.0m 13s and forecast to arrive on Tuesday (Sep 01) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 4s period and expected on Tuesday (Sep 08) at 8AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Tue 1st Sep) | 8ft (2.5m) 13s |
| Best Surf | 2PM (Tue 1st Sep) | 10ft (3.0m) 13s |
| Most Powerful | 8PM (Tue 1st Sep) | 10ft (3.0m) 13s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Alright, Rusty here again, lookin' at the Onrus forecast for the next couple weeks.
We got a solid SW groundswell hitting the reef Tuesday morning, the 1st of September. It's a clean 8ft swell with a 13 second period, and the water's a bit colder than usual, about a degree off, at 59°. The combined energy is a strong 2340. Light cross-off wind means the lineup will be clean. This is a proper size for an intermediate spot, and with crowds only 'sometimes', Tuesday morning should be good. By the afternoon, the swell jumps to 10ft; that's expert territory.
Wednesday the 2nd holds the 10ft swell in the morning, but the wind goes cross-on, adds a little texture. By afternoon, it drops to 8ft but still cross-on. Thursday the 3rd, the wind shifts onshore, and it starts getting messy.
From Friday the 4th through the 7th, it's a scrape. Strong east winds blow cross-on or onshore, and the swell gets small. There's a pulse of a very long 16 second swell on the 6th, but with 40 km/h winds, it's a mess. Better for kites.
We get a clean moment on the morning of the 8th, with a small 2ft swell and offshore wind. Glassy, but not much power. After that, the next week is mostly onshore wind and weak surf. The 15th sees a bump to 6ft, but the winds are still not great.
Then, Wednesday the 16th of September is a second standout. A clean 4ft SW groundswell with a super long 18 second period. Light cross-off wind, combined energy of 1633. Will be clean and lined up. It's a promising long-range call, so keep an eye on it.
So your best bets are the 1st and the 16th. The rest of it is mostly a blown-out wait.
Rusty.
Short Range ForecastModerate rain (total 10mm), heaviest on Thu afternoon. Very mild (max 16°C on Wed morning, min 11°C on Tue morning). Winds increasing (light winds from the WSW on Tue morning, strong winds from the SE by Thu afternoon). | Days 4-6 Weather SummaryMostly dry. Warm (max 21°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). | ||||||||||||||||||||
Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | |||||||||||||||
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 13 | SW 13 | SW 14 | SW 13 | SW 13 | WSW 13 | S 8 | S 9 | S 9 | S 8 | S 8 | WSW 11 | SSW 10 | SSW 10 | SW 18 | SW 16 | SSW 18 | SSW 15 | SSW 13 | S 12 | S 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2340 | 3257 | 3518 | 2802 | 2354 | 1338 | 675 | 1007 | 828 | 346 | 219 | 143 | 173 | 183 | 790 | 1164 | 745 | 381 | 572 | 480 | 284 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-on | cross-on | cross-off | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross-off |
High Tide | 5:38PM1.57m | 6:00AM1.36m | 6:18PM1.46m | 6:47AM1.24m | 7:09PM1.32m | 7:53AM1.12m | 8:28PM1.19m | 9:44AM1.06m | 10:28PM1.15m | 11:40AM1.14m | 00:06AM1.23m | 12:49PM1.30m | 1:08AM1.36m | ||||||||
Low Tide | 11:22AM0.18m | 11:55PM0.20m | 11:59AM0.29m | 00:39AM0.31m | 12:45PM0.42m | 1:37AM0.44m | 1:53PM0.55m | 3:13AM0.54m | 3:56PM0.62m | 5:16AM0.51m | 5:56PM0.53m | 6:34AM0.38m | 7:05PM0.37m | ||||||||
 | |  | | | |  | |  | | | | | | | | | | | | | |
 | 7:01 | — | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — | — | 6:56 | — | — | 6:56 | — | — | 6:54 | — | — |
 | — | 6:23 | — | — | 6:24 | — | — | 6:24 | — | — | 6:25 | — | — | 6:27 | — | — | 6:28 | — | — | 6:28 | — |
mm | — | — | — | — | — | — | 2 | 8 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 15 | 13 | 16 | 16 | 14 | 14 | 15 | 14 | 16 | 17 | 13 | 17 | 19 | 15 | 18 | 21 | 17 | 25 | 27 | 23 |
Feels °C | 12 | 13 | 10 | 15 | 14 | 13 | 12 | 7 | 7 | 7 | 8 | 5 | 10 | 11 | 9 | 11 | 14 | 14 | 24 | 25 | 22 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 13 | SW 14 | SW 13 | SW 13 | WSW 13 | WSW 12 | WSW 12 | WSW 12 | S 8 | S 8 | SSE 7 | SSW 10 | SSW 10 | SW 18 | SW 16 | SW 14 | SSW 15 | SSW 13 | S 12 | S 11 |
| kJ | 2340 | 3257 | 3518 | 2802 | 2354 | 1338 | 668 | 477 | 280 | 346 | 219 | 81 | 173 | 183 | 790 | 1164 | 590 | 381 | 572 | 480 | 284 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | S 9 | — | WNW 11 | WSW 12 | WSW 11 | WSW 11 | WSW 11 | WSW 10 | WSW 10 | SSW 10 | SSW 21 | SSW 18 | SE 8 | WSW 13 | WSW 13 | WSW 12 |
| kJ | — | — | — | — | — | 134 | — | 25 | 311 | 200 | 146 | 143 | 88 | 55 | 107 | 483 | 745 | 95 | 154 | 151 | 82 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | SW 14 | SSW 14 | SSW 9 | — | SW 21 | SW 9 | — | SSE 8 | WSW 14 | SE 9 | WSW 13 | — |
| kJ | — | — | — | — | — | — | — | — | — | 8 | 18 | 77 | — | 18 | 22 | — | 62 | 253 | 21 | 133 | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | S 8 | S 9 | S 9 | ESE 4 | ESE 4 | E 4 | ESE 5 | SE 5 | SE 6 | ESE 5 | ESE 5 | ENE 4 | — | — | — |
| kJ | — | — | — | — | — | — | 675 | 1007 | 828 | 39 | 37 | 28 | 61 | 65 | 114 | 87 | 104 | 11 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 25 | 10 | 10 | 32 | 10 | 32 | 532 | 247 | 1364 | 3825 | 45 | 45 | 86 | 86 | 38 | 38 | 10 | 4 | 4 | 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.
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