
Surf Forecasts:
Onrus surf forecast from 11 Sep 2026:
- Best quality surf: Tuesday 15 Sep, 11PM (local time) - 10ft (3.0m), 15s period, WSW swell with cross-offshore winds.
- Most powerful swell: Tuesday 15 Sep, 11PM (local time) - 10ft (3.0m), 15s period, WSW swell with 3,901 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 2AM (local time) - 4.5ft (1.3m), 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 2AM. The primary swell is predicted to be 1.3m and 13s period with a secondary swell of 1.0m and 8s. 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 15s and forecast to arrive on Tuesday (Sep 15) at 11PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 9s period and expected on Sunday (Sep 13) at 8AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Mon 14th Sep) | 4.5ft (1.3m) 13s |
| Best Surf | 11PM (Tue 15th Sep) | 10ft (3.0m) 15s |
| Most Powerful | 11PM (Tue 15th Sep) | 10ft (3.0m) 15s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Right then, grab a coffee and let’s have a proper look at what’s heading our way for the next couple of weeks. It’s a bit of a mixed bag, so let’s not get too excited too quickly.
The forecast starts off a bit rough, honestly. The first real chance of anything surfable at Onrus isn’t until Monday the 14th, and even then, it’s a real “maybe” situation. The swell’s there, but the wind is the boss right now.
Right from the start, Friday the 11th is a write-off. We’ve got a 6 ft SW swell pumping in, with a solid 12-second period, and that’s a lot of energy, but that onshore wind from the ESE at 19 mph is just chopping everything to bits. The water’s sitting at 59°F, which is a touch under what you’d expect for this time of year, but nothing crazy.
The whole weekend is the same story. Saturday the 12th has a bigger 6 ft SW swell, long period at 15 seconds, and even more energy, but that cross-onshore wind keeps it messy. It’s just poor, messy surf. Not worth the paddle. By Sunday the 13th, the swell drops back to 6 ft, period 14 seconds, but it’s still cross-onshore and lumpy.
Then Monday the 14th rolls in, and it’s the first glimmer of hope. The wind finally swings offshore from the NW at 19 mph and the surf cleans right up. The swell’s only 4 ft from the SW, so it’s not big, but it’s clean. It’s a marginal day, but if you’re keen for a slide, this is the first real option. The water’s still the same temp, about normal for here.
The offshore wind sticks around for Tuesday the 15th. The swell is 6 ft from the W but with a very short period of 6 seconds. That’s weak, bumpy windswell. Not great, not terrible. Wednesday the 16th, the swell bumps up to 8 ft from the SW, but the wind is onshore again from the SSE. That’s a lot of water moving, but it’s going to be a washing machine. Thursday the 17th has a 8 ft SW swell but again onshore wind from the SSE. That’s expert-only territory size-wise, but the conditions are poor.
The best day in the first week is a standout: Saturday the 19th. Saturday morning is glassy. Dead calm. The swell is a clean 4 ft from the SW. It’s not a huge day, but with no wind, the Onrus reef is going to be clean and tidy. This is the one to circle in your calendar. It’ll be clean and fun.
From there, it’s a bit of a mixed bag again. Sunday the 20th is cross-onshore again. But then, incredibly, we get another glassy morning on Monday the 21st. The swell is 5 ft from the WSW with a lovely 13-second period. This is a real treat. Clean, glassy waves on a Monday. It’s a true standout.
The following week looks more unpredictable. Tuesday the 22nd is a write-off with strong ESE winds. Wednesday the 23rd has a big swell of 7 ft but it’s cross-onshore and messy. Too big for beginners, and a bit of a chore for everyone else.
Then, another promising day appears on the horizon. Thursday the 24th looks very good. The wind goes light from the WNW, cross-offshore, and the 5 ft SW swell should be clean. That’s a good day.
Friday the 25th and Saturday the 26th finish the period. Friday has offshore winds again from the NW, but the swell is smaller at 5 ft. Saturday is bigger, at 6 ft from the S, but the wind is cross-offshore from the WSW, so it could be clean but might have some lumps.
So, to sum it up: the real standouts are Saturday the 19th and Monday the 21st for those glassy, clean sessions. Thursday the 24th is a strong third option. The rest is a case of picking through the wind and hoping for the best, but those two windows are the gold.
Rusty.
Short Range ForecastModerate rain (total 17mm), heaviest on Sat afternoon. Very mild (max 19°C on Sun afternoon, min 15°C on Fri morning). Winds decreasing (fresh winds from the E on Sat night, light winds from the NW by Sun night). | Days 4-6 Weather SummaryModerate rain (total 13mm), heaviest on Mon morning. Very mild (max 18°C on Mon morning, min 11°C on Wed night). Mainly strong winds. | ||||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | |||||||||||||||
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 | WSW 12 | WSW 12 | SW 15 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 12 | WNW 7 | SW 11 | W 6 | SW 16 | WSW 15 | SW 14 | SW 13 | WSW 13 | SW 12 | SW 12 | SW 13 |
Wave Graph | |||||||||||||||||||||
933 | 647 | 407 | 1526 | 2909 | 2229 | 1355 | 878 | 537 | 335 | 311 | 183 | 243 | 931 | 3682 | 2317 | 2241 | 718 | 963 | 1771 | 1977 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | off | off | off | off | off | off | glassy | on | on | glassy | on | on | on |
High Tide | 3:27PM1.75m | 3:45AM1.60m | 3:59PM1.73m | 4:17AM1.56m | 4:30PM1.67m | 4:48AM1.49m | 4:59PM1.58m | 5:18AM1.40m | 5:29PM1.45m | 5:48AM1.29m | 5:59PM1.31m | 6:20AM1.17m | 6:32PM1.17m | ||||||||
Low Tide | 9:17AM0.03m | 9:45PM0.00m | 9:49AM0.04m | 10:16PM0.03m | 10:20AM0.09m | 10:46PM0.09m | 10:49AM0.17m | 11:15PM0.19m | 11:18AM0.28m | 11:43PM0.30m | 11:46AM0.40m | 00:13AM0.43m | 12:16PM0.52m | 00:49AM0.55m | |||||||
6:48 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:43 | — | — | 6:41 | — | — | 6:39 | — | — | |
— | 6:30 | — | — | 6:31 | — | — | 6:31 | — | — | 6:32 | — | — | 6:34 | — | — | 6:35 | — | — | 6:35 | — | |
mm | — | — | — | 1 | 6 | 1 | 1 | 1 | 7 | 3 | — | 1 | — | — | 7 | 2 | — | — | — | — | — |
Temp °C | 15 | 16 | 15 | 16 | 16 | 15 | 17 | 19 | 17 | 18 | 18 | 16 | 16 | 18 | 16 | 13 | 13 | 13 | 14 | 15 | 13 |
Feels °C | 11 | 11 | 11 | 13 | 12 | 9 | 14 | 16 | 15 | 12 | 11 | 11 | 11 | 11 | 11 | 9 | 9 | 9 | 11 | 9 | 8 |
Swell 1 Height (m) Direction Period (s) | SW 12 | WSW 12 | WSW 12 | SW 15 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 12 | SW 12 | SW 11 | SW 11 | SW 16 | WSW 15 | SW 14 | SW 13 | SW 12 | SW 12 | SW 12 | SW 13 |
933 | 647 | 407 | 1526 | 2909 | 2229 | 1355 | 878 | 537 | 335 | 268 | 183 | 150 | 931 | 3682 | 2317 | 2241 | 718 | 963 | 1771 | 1977 | |
Swell 2 Height (m) Direction Period (s) | — | — | SSW 10 | S 8 | — | — | — | — | SSE 8 | SE 11 | SE 13 | ESE 12 | SW 19 | SW 11 | ESE 11 | WSW 13 | W 13 | WSW 13 | SW 15 | SW 15 | — |
— | — | 86 | 58 | — | — | — | — | 120 | 76 | 59 | 13 | 127 | 159 | 40 | 307 | 799 | 699 | 623 | 479 | — | |
Swell 3 Height (m) Direction Period (s) | — | — | SW 15 | — | — | — | — | — | — | SSE 14 | — | SW 17 | SW 15 | SE 13 | — | ESE 11 | ESE 11 | SSW 18 | WSW 12 | W 12 | — |
— | — | 107 | — | — | — | — | — | — | 18 | — | 12 | 80 | 7 | — | 23 | 23 | 32 | 160 | 139 | — | |
Wind waves Height (m) Direction Period (s) | SSE 7 | SSE 7 | SSE 7 | SSE 7 | SE 7 | SE 8 | SE 8 | SE 8 | — | WNW 6 | WNW 7 | WNW 6 | W 6 | W 8 | — | — | — | — | — | — | SE 6 |
195 | 210 | 137 | 145 | 178 | 292 | 363 | 292 | — | 93 | 311 | 67 | 243 | 541 | — | — | — | — | — | — | 171 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 91 | 335 | 4 | 4 | 89 | 23 | 4 | 38 | 0 | 155 | 103 | 8 | 103 | 155 | 4 | 221 | 23 | 0 | 4 | 314 | 40 |
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.










