Surf Forecasts:
Cunns surf forecast from 20 Aug 2026:
- Best quality surf: Thursday 20 Aug, 9PM (local time) - 5ft (1.6m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Friday 21 Aug, 12PM (local time) - 5.5ft (1.7m), 16s period, SW swell with 1,548 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 9PM (local time) - 5ft (1.6m), 16s 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 Thursday (Aug 20) at 9PM. The primary swell is predicted to be 1.6m and 16s period with a secondary swell of 0.4m and 16s. 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 16s and forecast to arrive on Friday (Aug 21) at 12PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Monday (Aug 24) at 9AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Thu 20th Aug) | 5ft (1.6m) 16s |
| Best Surf | 9PM (Thu 20th Aug) | 5ft (1.6m) 16s |
| Most Powerful | 12PM (Fri 21st Aug) | 5.5ft (1.7m) 16s |
Table - best surf conditions forecast for Cunns over the next 16 days.
The Lowdown
Alright, Rusty here, and I’ve got a good look at what’s on the table for our stretch of coast. Let’s get into it.
The only break that’s really worth talking about is Cunns. It’s a reef setup, so it’s for the advanced crew, and it’s inconsistent, so you’ve got to be patient. The water is sitting at 59°F, which is pretty much bang on average for this time of year, nothing to get excited about there.
The good news doesn’t really kick in until Friday morning, with a SW swell coming in at 5ft and a 15-second period (proper groundswell, which is great for reefs). The combined energy is moderate (1423), and while the wind is cross-shore, it’s still clean. Friday afternoon is where it gets seriously good: 6ft SW swell, 16-second period, combined energy of 1511, and a cross-off wind that’s cleaning it up nicely. This is for experienced surfers only, but it’s a standout.
Saturday morning is another solid call, with 5ft SW swell, 15-second period, and a cross-off breeze from the ENE. The energy is 1238, and it’s clean. Saturday afternoon sees a drop in size to 5ft, but it’s still clean. Sunday morning holds 5ft SW with a 17-second period (very long period) and a cross-off wind, giving a combined energy of 1282. Just be aware that with such a long period, it might break a bit too straight at beach breaks, but on a reef like Cunns, it’ll be lined up nicely.
Tuesday morning, the 25th, is a real gem. The wind goes glassy from the ENE, with a 5ft SW swell and a 15-second period. The combined energy is 1059, and it’s glassy – that’s as clean as it gets for experienced surfers.
After that, things get messy. The end of August and start of September sees a lot of strong wind, big swell, and poor conditions. The standout in the second week is Tuesday, 1st September morning: 7ft from the W with a 15-second period, and the wind goes glassy from the WNW. The combined energy is 1937, and it’s excellent for experienced surfers. That’s your best bet in the long range, but it’s a bit uncertain being so far out.
The final call is Friday afternoon, 4th September, with a 5ft SW swell, 17-second period, and a cross-off wind from the south. The energy is 2640, and it’s clean. A solid way to finish the outlook.
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 4-6 Weather SummaryMostly dry. Very mild (max 19°C on Sun afternoon, min 10°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | |||||||||||||||
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 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 17 | SW 16 | SW 15 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 12 | SW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 416 | 574 | 1232 | 1048 | 1511 | 1402 | 1216 | 936 | 836 | 1267 | 886 | 550 | 393 | 331 | 596 | 975 | 886 | 725 | 424 | 260 | 404 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-off | cross | cross-off | cross-off | cross-off | cross-off | off | cross | glassy | glassy | off | cross-off | cross | cross-off | cross-off | cross-off | cross | cross | cross |
High Tide | 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 | 12:06PM1.30m | 00:22AM0.89m | |||||||
Low Tide | 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 | 5:35AM0.21m | 6:40PM0.08m | ||||||||
 | |  |  | | | | | | | |  | | |  |  | | | | | | |
 | 7:09 | — | — | 7:09 | — | — | 7:07 | — | — | 7:05 | — | — | 7:05 | — | — | 7:03 | — | — | 7:03 | — | — |
 | — | 6:13 | — | — | 6:14 | — | — | 6:14 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 16 | 14 | 12 | 13 | 13 | 15 | 16 | 14 | 18 | 19 | 16 | 16 | 16 | 15 | 13 | 13 | 12 | 16 | 20 | 19 |
Feels °C | 13 | 12 | 12 | 9 | 10 | 10 | 13 | 12 | 10 | 15 | 18 | 14 | 13 | 12 | 12 | 9 | 9 | 10 | 12 | 16 | 13 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 17 | SW 16 | SW 15 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 12 | SW 14 |
| kJ | 416 | 574 | 1232 | 1048 | 1511 | 1402 | 1216 | 936 | 836 | 1267 | 886 | 550 | 393 | 331 | 596 | 975 | 886 | 725 | 424 | 260 | 404 |
Swell 2 Height (m) Direction Period (s) | SW 9 | SW 8 | SW 19 | SW 18 | — | — | SW 23 | SW 21 | SW 19 | — | — | — | SW 20 | SW 18 | SW 13 | — | — | — | — | SW 16 | SW 22 |
| kJ | 99 | 58 | 303 | 375 | — | — | 86 | 285 | 369 | — | — | — | 15 | 84 | 231 | — | — | — | — | 42 | 20 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | SW 16 | SW 16 | — | SW 16 | — | — | — | — | — | — | — | ESE 3 | — | SW 17 | SSW 5 | — | — | N 2 | — | NNE 2 |
| kJ | — | 91 | 61 | — | 95 | — | — | — | — | — | — | — | 4 | — | 70 | 23 | — | — | 1 | — | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 1045 | 0 | 491 | 0 | 0 | 0 | 491 | 0 | 0 | 0 | 0 | 0 | 243 | 0 | 0 | 0 | 0 | 0 | 1 | 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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