Surf Forecasts:
Onrus surf forecast from 18 Jul 2026:
- Best quality surf: Thursday 23 Jul, 5AM (local time) - 10ft (3.0m), 11s period, WSW swell with cross-offshore winds.
- Most powerful swell: Thursday 23 Jul, 11PM (local time) - 11ft (3.5m), 16s period, SW swell with 6,757 kJ wave energy.
- Next surfable swell (1★+): Saturday 18 Jul, 11PM (local time) - 6ft (1.9m), 12s period with WSW 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 Saturday (Jul 18) at 11PM. The primary swell is predicted to be 1.9m and 12s period with a secondary swell of 1.7m and 12s. Another secondary swell of 0.8m and 10s is also forecast. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Onrus in the next 16 days are 3.5m 16s and forecast to arrive on Thursday (Jul 23) at 11PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 6s period and expected on Sunday (Jul 19) at 5AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Sat 18th Jul) | 6ft (1.9m) 12s |
| Best Surf | 5AM (Thu 23rd Jul) | 10ft (3.0m) 11s |
| Most Powerful | 11PM (Thu 23rd Jul) | 11ft (3.5m) 16s |
Table - best surf conditions forecast for Onrus over the next 16 days.
The Lowdown
Alright, Rusty here again. Let's break down Onrus in feet and everything else your American brain needs. This reef break is a fickle one – inconsistent, but when it lines up, it's a proper little slice of heaven. Water temp is about 60°F, which is average for this time of year – no surprises.
The next two weeks start a bit meh. Saturday July 18 afternoon: 1.5m (5 ft) from the WSW, cross-off wind, moderate energy (781). It's clean but small. Sunday July 19 is similar – a bit bigger but still marginal with stronger winds. Monday July 20 morning looks better: 1.7m (5.6 ft) from the SW, light offshore NW breeze at 5 km/h (3 mph), and clean. Energy is moderate (537). Surfable, but not a standout.
Now Tuesday July 21 is the real deal. Morning: 2.1m (6.9 ft) SW groundswell, period 14 seconds, glassy – wind from the north at 5 km/h (3 mph), no ripples. Combined energy 1662 (moderate-strong). That's a dreamy combo for a reef: long period means power and shape, and glassy conditions mean clean faces. Ideal for experienced surfers. The afternoon is bigger: 2.5m (8.2 ft) SW, 13 seconds, still glassy, energy 2207. That's expert territory. Crowds are possible on a good day, so expect some company.
Wednesday July 22 morning: 1.9m (6.2 ft) SW, 12 seconds, gentle offshore NW at 15 km/h (9 mph), clean, energy 1082. Afternoon gets a fresh offshore at 35 km/h (22 mph) but swell is 2.5m (8.2 ft) from the WSW – still good but a bit more wind. Thursday July 23 morning is glassy with 2.0m (6.6 ft) WSW, 11 seconds, energy 955 (moderate). Then the afternoon gem: only 1.3m (4.3 ft) from the SSW, but period is 19 seconds – that's a super long period groundswell. Energy is 3019 (strong) despite the smaller size. Glassy with a light WSW breeze. For a reef, that long period will produce lined-up waves – a standout for those who love a long ride.
Then the wheels fall off. Friday July 24 is too big – 3.0m (9.8 ft) SW, 14 seconds, glassy
Short Range ForecastSome drizzle, heaviest during Sun morning. Very mild (max 18°C on Sat afternoon, min 12°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 17°C on Wed afternoon, min 11°C on Tue night). Winds increasing (calm on Tue night, fresh winds from the NW by Wed afternoon). | |||||||||||||||||||
Sat 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | ||||||||||||||
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) | WSW 9 | WSW 12 | WSW 12 | SW 9 | SW 10 | SW 9 | SW 8 | SSW 16 | SW 14 | SW 13 | SW 13 | SW 12 | WSW 12 | WSW 11 | WSW 11 | SSW 19 | SW 16 | SW 14 | SW 14 | SW 13 |
Wave Graph  | ||||||||||||||||||||
 kJ | 362 | 1114 | 1018 | 945 | 851 | 478 | 205 | 310 | 1617 | 2172 | 1521 | 1077 | 2055 | 1307 | 940 | 1166 | 6427 | 3830 | 3025 | 2532 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | cross-off | cross-off | cross-off | off | cross-off | cross-off | glassy | glassy | off | off | off | off | glassy | cross-off | off | glassy | glassy | cross-on |
High Tide | 6:19PM1.56m | 6:36AM1.32m | 7:00PM1.46m | 7:20AM1.21m | 7:44PM1.34m | 8:10AM1.10m | 8:34PM1.23m | 9:16AM1.02m | 9:41PM1.14m | 10:45AM1.00m | 11:04PM1.11m | 12:12PM1.04m | 00:20AM1.14m | |||||||
Low Tide | 00:40AM0.26m | 12:39PM0.28m | 1:24AM0.36m | 1:19PM0.41m | 2:12AM0.46m | 2:05PM0.53m | 3:12AM0.54m | 3:08PM0.63m | 4:32AM0.59m | 4:43PM0.67m | 5:58AM0.57m | 6:16PM0.65m | ||||||||
 |  |  |  | | | | | | | | | |  | | | | | | | |
 | — | — | 7:45 | — | — | 7:45 | — | — | 7:43 | — | — | 7:43 | — | — | 7:43 | — | — | 7:43 | — | — |
 | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:53 | — | — | 5:54 | — | — | 5:55 | — | — | 5:55 | — |
mm | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 18 | 16 | 15 | 15 | 14 | 14 | 15 | 13 | 14 | 15 | 13 | 15 | 17 | 15 | 16 | 17 | 15 | 16 | 17 | 16 |
Feels °C | 15 | 14 | 10 | 11 | 12 | 13 | 13 | 12 | 13 | 13 | 13 | 11 | 11 | 10 | 16 | 16 | 15 | 16 | 16 | 16 |
Swell 1 Height (m) Direction Period (s) | WSW 9 | WSW 12 | W 11 | SW 9 | SW 10 | SW 9 | SW 8 | SSW 16 | SW 14 | SW 13 | SW 13 | SW 12 | WSW 12 | WSW 11 | WSW 11 | WSW 11 | SW 16 | SW 14 | SW 14 | SW 13 |
| kJ | 362 | 795 | 83 | 945 | 851 | 478 | 205 | 310 | 1617 | 2172 | 1521 | 1077 | 1447 | 1307 | 940 | 940 | 6427 | 3830 | 3025 | 2532 |
Swell 2 Height (m) Direction Period (s) | SW 13 | S 11 | S 10 | W 11 | W 10 | W 10 | SW 11 | SW 7 | W 9 | SE 12 | ESE 11 | SE 11 | SE 11 | SE 14 | SE 13 | SSW 19 | SE 12 | SE 11 | ESE 11 | ESE 11 |
| kJ | 273 | 110 | 52 | 56 | 17 | 46 | 140 | 54 | 24 | 21 | 12 | 5 | 5 | 7 | 6 | 1166 | 34 | 20 | 12 | 12 |
Swell 3 Height (m) Direction Period (s) | S 11 | W 11 | — | SSE 10 | SSE 9 | SE 9 | W 10 | SW 12 | SE 12 | W 9 | — | — | SE 14 | — | S 21 | ESE 12 | — | — | — | — |
| kJ | 146 | 116 | — | 32 | 17 | 13 | 47 | 93 | 21 | 14 | — | — | 8 | — | 9 | 14 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | WSW 12 | WSW 12 | — | — | — | — | — | — | — | — | — | WSW 12 | NNW 5 | — | WSW 12 | — | — | — | — |
| kJ | — | 1114 | 1018 | — | — | — | — | — | — | — | — | — | 2055 | 2 | — | 913 | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 50 | 0 | 60 | 17 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 155 | 0 | 0 | 0 | 25 | 10 | 10 | 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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