Surf Forecasts:
Cactus surf forecast from 19 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 9PM (local time) - 5ft (1.5m), 15s period, SW swell with cross-offshore winds.
- Most powerful swell: Tuesday 25 Aug, 6AM (local time) - 6ft (1.8m), 16s period, SW swell with 1,697 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 9PM (local time) - 5ft (1.5m), 15s period with SW swell.
Best Forecast Surf Conditions for Cactus this week:
The surf forecast for Cactus over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 19) at 9PM. The primary swell is predicted to be 1.5m and 15s period with a secondary swell of 0.8m and 18s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Cactus in the next 16 days are 1.8m 16s and forecast to arrive on Tuesday (Aug 25) at 6AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Sunday (Aug 23) at 12AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Wed 19th Aug) | 5ft (1.5m) 15s |
| Best Surf | 9PM (Wed 19th Aug) | 5ft (1.5m) 15s |
| Most Powerful | 6AM (Tue 25th Aug) | 6ft (1.8m) 16s |
Table - best surf conditions forecast for Cactus over the next 16 days.
The Lowdown
Alright, let’s talk about Cactus, a reef setup that’s got a solid window coming up. The water temperature is 59°, which is pretty much bang on average for this time of year, so nothing unusual there.
The next few days are a bit of a mixed bag. Wednesday afternoon is a write-off – cross-on wind, choppy, and the combined swell energy is 1142, which is moderate, but it's messy. Not worth paddling out.
The first real standout is Thursday morning, 20th August. Glass. Wind is WSW at just 3 mph, basically nothing. The swell is 3 ft from the SW with a long 16-second period – that’s quality groundswell. The energy is moderate at 515, but with that glassy surface, it’s going to be clean. Cactus is a reef, so that long period will wrap in nicely. This is the pick of the early period.
Conditions get a bit lumpy again Thursday afternoon and all through Friday, with cross-on winds and choppy surf. The swell is bigger, around 5 ft, but the wind spoils it.
Saturday morning, 22nd August, is a beauty. Clean offshore wind from the ENE at 6 mph, swell 5 ft from the SW, 15-second period. The energy is strong at 1286. This is solid, powerful surf, and with offshore wind, it’ll be well shaped. It’s bigger than 5 ft, so it’s more for experienced surfers, but the quality is top notch. Saturday afternoon stays clean with a cross-off breeze.
Sunday morning, 23rd August, has a cross-off breeze and a 5 ft SW swell, but the real gem is Sunday afternoon – glassy again, no wind, swell 4 ft from the SW with a 17-second period. That’s very long period groundswell, and on a reef, it’s going to be pure and lined up. The energy is 897, moderate. This is a session you’ll remember.
The second week runs a bit hotter and colder. Monday 24th and Tuesday 25th are mostly cross-shore chop and messy. Wednesday 26th morning has a clean cross-off breeze and 4 ft swell, but it’s inconsistent. The 12-second period is okay, but the energy is low at 543. Thursday 27th morning is blown out by a strong 19 mph north wind, but Thursday afternoon gets interesting – a 5 ft SW swell with a very long 19-second period, energy at 1789. That’s strong, but the wind is cross-shore, so it’ll be a bit bumpy.
Friday 28th morning has a 7 ft SW swell – that’s expert territory – with a cross-off breeze and 16-second period, energy at 1953. It’s powerful, but only for the experienced crew. Saturday 29th sees offshore wind from the NE, but it’s strong at 25 mph, making it hard to paddle into. Sunday 30th through to the end of the window is a downward slide – poor conditions, onshore winds, and small swell.
So, the true standouts are Thursday morning 20th August for the glassy, clean 3 ft groundswell, and Sunday afternoon 23rd August for the glassy, long-period 4 ft swell. Saturday morning 22nd is also wicked if you’ve got the skill for the size.
– Rusty
Short Range ForecastMostly dry. Very mild (max 16°C on Thu morning, min 12°C on Fri morning). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Mon morning. Warm (max 20°C on Sun afternoon, min 13°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Wed 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | ||||||||||||||
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 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 17 | SW 16 | SW 15 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 13 |
Wave Graph | ||||||||||||||||||||
966 | 685 | 416 | 574 | 1216 | 949 | 1364 | 1281 | 1200 | 924 | 746 | 1282 | 897 | 557 | 393 | 565 | 1364 | 1568 | 1155 | 778 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | off | glassy | cross-on | cross-on | cross-on | cross-on | cross-off | off | cross-off | off | cross-off | glassy | glassy | cross | cross | cross-on | cross | cross-on | cross-off |
High Tide | 3:00AM1.03m | 2:07PM0.91m | 3:19AM0.92m | 1:48PM0.84m | 3:31AM0.80m | 12:48PM0.83m | 2:55AM0.66m | 11:50AM0.92m | 1:02AM0.62m | 11:40AM1.06m | 00:18AM0.68m | 11:50AM1.19m | 00:13AM0.78m | |||||||
Low Tide | 8:28PM0.06m | 8:43AM0.44m | 8:36PM0.13m | 8:44AM0.56m | 8:33PM0.21m | 7:56AM0.66m | 8:02PM0.28m | 5:37AM0.64m | 7:09PM0.28m | 5:03AM0.50m | 6:40PM0.23m | 5:15AM0.35m | 6:35PM0.15m | |||||||
— | — | 7:09 | — | — | 7:09 | — | — | 7:07 | — | — | 7:05 | — | — | 7:05 | — | — | 7:03 | — | — | |
6:12 | — | — | 6:13 | — | — | 6:14 | — | — | 6:14 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | 1 | — | — | — |
Temp °C | 15 | 15 | 16 | 16 | 14 | 13 | 13 | 14 | 15 | 16 | 14 | 19 | 20 | 18 | 16 | 16 | 14 | 14 | 14 | 13 |
Feels °C | 11 | 13 | 13 | 13 | 12 | 10 | 9 | 11 | 12 | 12 | 10 | 15 | 18 | 16 | 15 | 12 | 10 | 9 | 9 | 9 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 17 | SW 16 | SW 15 | SW 14 | — | — | — | — | SW 13 |
966 | 685 | 416 | 574 | 1216 | 949 | 1364 | 1281 | 1200 | 924 | 746 | 1282 | 897 | 557 | 393 | — | — | — | — | 778 | |
Swell 2 Height (m) Direction Period (s) | SW 20 | SW 18 | SW 9 | SW 8 | SW 19 | SW 18 | — | — | SW 23 | SW 21 | SW 19 | — | — | SW 21 | SW 20 | — | — | — | — | — |
99 | 201 | 99 | 58 | 303 | 375 | — | — | 86 | 162 | 369 | — | — | 18 | 60 | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | SW 15 | — | — | SW 16 | SW 15 | SW 17 | SW 16 | — | — | — | ESE 4 | NE 3 | — | — | — | SW 14 | SW 16 | SW 15 | SW 14 | SW 14 |
77 | — | — | 66 | 60 | 75 | 95 | — | — | — | 9 | 2 | — | — | — | 565 | 1364 | 1568 | 1155 | 64 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1227 | 0 | 0 | 632 | 0 | 552 | 632 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 491 | 491 | 491 | 552 | 0 |
Best forecast wave conditions in Nullarbor | ||||||||||||||||||||
Best forecast wave conditions in Australia | ||||||||||||||||||||
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Information about the Cactus Surf forecast
The above surf forecast table for Cactus provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Cactus can be found by selecting the local surf guide option on the grey menu. Our Cactus 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 (Cactus) 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 Cactus 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.
Are you planning a holiday in Nullarbor? If you are looking for accommodation near Cactus, camping, hotels and holiday cottages in Nullarbor, consider staying in Thevenard which is 63 km (39 miles) away.











