Surf Forecasts:
Cunns surf forecast from 17 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 9PM (local time) - 4.5ft (1.4m), 14s period, SW swell with cross-offshore winds.
- Most powerful swell: Friday 21 Aug, 6AM (local time) - 5.5ft (1.7m), 17s period, SW swell with 1,663 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 9PM (local time) - 3.5ft (1.1m), 15s period with SW swell.
Best Forecast Surf Conditions for Cunns this week:
The surf forecast for Cunns over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Aug 17) at 9PM. The primary swell is predicted to be 1.1m and 15s period with a secondary swell of 0.6m and 20s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Cunns in the next 16 days are 1.7m 17s and forecast to arrive on Friday (Aug 21) at 6AM. Winds are predicted to be glassy 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+) | 9PM (Mon 17th Aug) | 3.5ft (1.1m) 15s |
| Best Surf | 9PM (Wed 19th Aug) | 4.5ft (1.4m) 14s |
| Most Powerful | 6AM (Fri 21st Aug) | 5.5ft (1.7m) 17s |
Table - best surf conditions forecast for Cunns over the next 16 days.
The Lowdown
Alright, Rusty here again. Let's talk about Cunns in feet and miles per hour. This reef break is a fickle one, inconsistent, but when it gets a solid SW groundswell, it can be a world-class wave.
Water temp is sitting at 59°F, which is about average for this time of year.
The week starts with a bit of a tease. Monday afternoon (17th August) has a clean 4ft SW groundswell with a very long 16s period, and the wind is light offshore. The energy is moderate (782). It's a good start, but Tuesday (18th) is a washout with a strong cross-shore wind making it lumpy. Wednesday (19th) is also marginal and not worth paddling out for.
The quality picks up on Thursday (20th). The morning is clean with a light cross-offshore breeze and a 3ft SW swell. The real standout is Thursday afternoon though – the wind goes completely glassy, dead calm, with a 4ft SW groundswell at 16s and moderate energy (645). That'll be a pristine session.
Now, the main event. Friday (21st) and Saturday (22nd) are the best days in the whole 16-day window. Friday morning is looking excellent: clear skies, a slight offshore breeze, and a solid 6ft SW groundswell with a 17s period. The energy is strong at 1643. This is a powerful, well-shaped wave for experienced surfers. The afternoon is still a clean 5ft, with a cross-offshore breeze. Saturday morning is also a beauty, with glassy conditions and a 5ft SW swell.
The surf dies down again after that. Sunday (23rd) and Monday (24th) are smaller and cleaner but lack punch. The next week gets messy. We get a big pulse of energy around the 26th and 27th, with waves up to 7ft to 8ft, but it's accompanied by a strong cross-onshore wind, making it choppy and lumpy – that's one for the experts only, and even then, it's not pretty. The period wraps up with a few cleaner but smaller days around the 29th and 30th of August, with 4ft SW swell and light winds.
So, the absolute best of the bunch is Friday 21st and Saturday 22nd of August. Get on it early. This is Rusty, signing off.
Short Range ForecastMostly dry. Warm (max 23°C on Tue afternoon, min 13°C on Wed night). Winds decreasing (fresh winds from the WSW on Tue afternoon, calm by Thu morning). | Days 5-7 Weather SummaryMostly dry. Very mild (max 18°C on Sun morning, min 13°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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 19 | SW 18 | SW 17 | WSW 16 | SW 15 | SW 15 | SW 14 | SW 16 | SW 16 | SW 15 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 16 | SW 15 |
Wave Graph  | ||||||||||||||||||||
 kJ | 619 | 520 | 686 | 482 | 1081 | 385 | 893 | 676 | 416 | 574 | 939 | 1643 | 1210 | 1297 | 1120 | 962 | 736 | 549 | 897 | 485 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross | on | cross-on | on | cross-on | off | cross-off | glassy | glassy | off | cross-off | glassy | glassy | cross-off | off | cross-off | cross-off | cross-off |
High Tide | 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 | |||||||
 |  |  | |  | | |  |  | | | | | | | | | | | | |
 | — | — | 7:11 | — | — | 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 | 20 | 23 | 14 | 15 | 15 | 14 | 16 | 16 | 14 | 15 | 15 | 14 | 15 | 15 | 14 | 18 | 20 | 18 |
Feels °C | 14 | 13 | 13 | 18 | 9 | 12 | 12 | 11 | 14 | 15 | 14 | 12 | 12 | 13 | 13 | 11 | 11 | 15 | 17 | 14 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 14 | SW 18 | SW 17 | SW 16 | SW 15 | SW 15 | SW 14 | SW 16 | SW 16 | SW 15 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 16 | SW 15 |
| kJ | 619 | 346 | 686 | 482 | 589 | 385 | 893 | 676 | 416 | 574 | 939 | 1643 | 1210 | 1297 | 1120 | 962 | 736 | 549 | 897 | 485 |
Swell 2 Height (m) Direction Period (s) | SW 22 | SW 19 | — | — | — | — | SW 20 | SW 18 | SW 9 | SW 8 | SW 19 | — | — | — | SW 24 | SW 21 | SW 19 | SW 18 | — | SW 21 |
| kJ | 163 | 520 | — | — | — | — | 99 | 201 | 119 | 71 | 361 | — | — | — | 22 | 117 | 303 | 304 | — | 18 |
Swell 3 Height (m) Direction Period (s) | — | S 10 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 19 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | ENE 3 | NNE 4 | NNW 4 | WSW 16 | WSW 8 | SW 15 | — | — | — | — | — | SW 16 | — | — | — | — | NNE 3 | — | — |
| kJ | — | 2 | 14 | 6 | 1081 | 149 | 77 | — | — | — | — | — | 90 | — | — | — | — | 3 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 401 | 401 | 649 | 652 | 1227 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 632 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Nullarbor | ||||||||||||||||||||
Best forecast wave conditions in Australia | ||||||||||||||||||||
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Information about the Cunns Surf forecast
The above surf forecast table for Cunns provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Cunns can be found by selecting the local surf guide option on the grey menu. Our Cunns 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 (Cunns) 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 Cunns 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 Cunns, camping, hotels and holiday cottages in Nullarbor, consider staying in Thevenard which is 64 km (40 miles) away.
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