Surf Forecasts:
Cactus surf forecast from 16 Aug 2026:
- Best quality surf: Thursday 20 Aug, 9PM (local time) - 5ft (1.5m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Friday 21 Aug, 9AM (local time) - 5.5ft (1.7m), 17s period, SW swell with 1,663 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 6AM (local time) - 2.5ft (0.7m), 17s 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 Monday (Aug 17) at 6AM. The primary swell is predicted to be 0.9m and 13s period with a secondary swell of 0.7m and 17s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Cactus in the next 16 days are 1.7m 17s and forecast to arrive on Friday (Aug 21) at 9AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Tuesday (Aug 18) at 6AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Mon 17th Aug) | 2.5ft (0.7m) 17s |
| Best Surf | 9PM (Thu 20th Aug) | 5ft (1.5m) 16s |
| Most Powerful | 9AM (Fri 21st Aug) | 5.5ft (1.7m) 17s |
Table - best surf conditions forecast for Cactus over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk surf at Cactus. We’ve got a good run ahead, starting with some clean, lined-up swell right from the get-go.
The pattern kicks off Monday the 17th of August. That morning you’ve got a nice 0.8m SW groundswell riding a long 16-second period. Wind’s light offshore, so it’s glassy and clean. Water temp is a normal 62°F, nothing weird. Energy’s moderate at 527, but the quality is high for the size. It’s a fun, small-wave session.
Monday afternoon bumps to 1.1m, same sweet period, still clean. Tuesday morning the wind gets a bit stronger at 30 km/h from the north-northeast, still cross-off, so it’s rideable but not as pristine. Tuesday afternoon goes cross-shore and the waves get a little lumpy – better to have had your fill before then.
Wednesday the 19th is a write-off with onshore wind. Thursday the 20th morning has a moment of glass with a 1.0m SW swell and light cross-off – worth a look. But the big standout is Friday the 21st.
Friday morning is the real deal. Clean 1.7m SW groundswell, 17-second period, light cross-off breeze. The combined energy is 1663 – that’s solid, powerful surf. It’s getting into expert territory size-wise, but for those with the skills, it’s going to be an absolute ripper. The reef will be holding beautifully. Crowds are possible here sometimes, so get in early.
Saturday the 22nd and Sunday the 23rd keep the momentum with 2–1.6m SW swells and clean mornings. Energy holds strong in the 1000-1100 range – these are great sessions for experienced surfers.
Monday the 24th drops to smaller 0.7–0.9m, still clean. Nice recovery day.
Then we hit a lull from Tuesday the 25th through Wednesday the 26th with rising winds and poor surf. The 26th has 45 km/h offshore gusts and heavy rain – that’s more of a kite day than a paddle day.
Now, from Thursday the 27th, it ramps back up. Thursday afternoon jumps to 1.7m with energy at 2846 – that’s strong. Friday the 28th morning brings a 1.6m swell with a massive 19-second period and moderate cross-off breeze. Energy is 1876. This is another standout: long-period groundswell, perfect for the reef but walled up on the beach. It’s for experts only, and it’s clean. This one’s about a week and a half out, so keep watching the forecasts.
Saturday the 29th is smaller and more cross-shore, then Sunday the 30th morning fires again with a 1.6m WSW swell, light offshore, and energy at 1139 – a clean finish to the month.
Monday the 1st of September brings onshore wind and messy conditions, ending the run.
Your two best bets: Friday the 21st (closer, reliable) and Friday the 28th (bigger potential, less certain). Cactus is looking good.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Tue afternoon, min 13°C on Mon morning). Winds decreasing (fresh winds from the N on Tue morning, light winds from the ENE by Wed night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 17°C on Thu morning, min 12°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | |||||||||||||||
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 16 | SW 16 | SW 19 | SW 18 | SW 17 | WSW 16 | SW 15 | SW 15 | SW 15 | SW 16 | SW 16 | SW 16 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 16 | SW 15 |
Wave Graph | |||||||||||||||||||||
314 | 619 | 520 | 679 | 482 | 1318 | 385 | 966 | 258 | 489 | 567 | 1041 | 1663 | 1330 | 1297 | 1082 | 988 | 936 | 777 | 979 | 535 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | cross-off | cross | on | on | on | off | cross-off | cross | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross | off |
High Tide | 1:49PM1.13m | 2:19AM1.13m | 1:59PM1.07m | 2:40AM1.10m | 2:07PM0.99m | 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 | |||||||
Low Tide | 8:02PM0.01m | 8:12AM0.23m | 8:15PM0.01m | 8:30AM0.33m | 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 | ||||||||
7:13 | — | — | 7:11 | — | — | 7:11 | — | — | 7:09 | — | — | 7:09 | — | — | 7:07 | — | — | 7:05 | — | — | |
— | 6:10 | — | — | 6:12 | — | — | 6:12 | — | — | 6:13 | — | — | 6:14 | — | — | 6:14 | — | — | 6:15 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 17 | 16 | 19 | 23 | 14 | 15 | 15 | 15 | 17 | 16 | 15 | 15 | 14 | 13 | 14 | 14 | 13 | 17 | 17 | 15 |
Feels °C | 13 | 14 | 12 | 12 | 17 | 8 | 11 | 11 | 13 | 15 | 12 | 13 | 13 | 11 | 10 | 11 | 10 | 9 | 15 | 13 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 16 | SW 14 | SW 18 | SW 17 | SW 16 | SW 15 | SW 20 | SW 10 | SW 16 | SW 16 | SW 16 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 16 | SW 15 |
205 | 619 | 398 | 679 | 482 | 589 | 385 | 99 | 231 | 489 | 567 | 1041 | 1663 | 1330 | 1297 | 1082 | 988 | 936 | 777 | 979 | 535 | |
Swell 2 Height (m) Direction Period (s) | SW 16 | SW 22 | SW 19 | — | — | — | — | SW 20 | SW 15 | SW 9 | SW 8 | SW 19 | — | — | — | SW 24 | SW 21 | SW 19 | SW 18 | — | — |
314 | 163 | 520 | — | — | — | — | 186 | 258 | 74 | 54 | 303 | — | — | — | 22 | 160 | 236 | 307 | — | — | |
Swell 3 Height (m) Direction Period (s) | SE 6 | — | SSE 4 | — | — | — | — | — | SW 18 | — | — | — | — | — | — | — | — | — | — | — | — |
8 | — | 3 | — | — | — | — | — | 201 | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | NE 2 | NNE 3 | NNW 4 | WSW 16 | WSW 8 | SW 15 | — | — | — | — | — | SW 16 | — | — | — | SSE 4 | — | — | — |
— | — | 1 | 8 | 8 | 1318 | 170 | 966 | — | — | — | — | — | 66 | — | — | — | 5 | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 401 | 401 | 641 | 652 | 1045 | 0 | 0 | 1219 | 0 | 0 | 0 | 0 | 0 | 154 | 0 | 0 | 0 | 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.











