Surf Forecasts:
Flatrock surf forecast from 12 Sep 2026:
- Best quality surf: Wednesday 16 Sep, 6AM (local time) - 10ft (3.0m), 15s period, SSW swell with offshore winds.
- Most powerful swell: Tuesday 15 Sep, 6AM (local time) - 11ft (3.5m), 15s period, SW swell with 5,651 kJ wave energy.
- Next surfable swell (1★+): Wednesday 16 Sep, 6AM (local time) - 10ft (3.0m), 15s period with SSW swell.
Best Forecast Surf Conditions for Flatrock this week:
The surf forecast for Flatrock over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Sep 16) at 6AM. The primary swell is predicted to be 3.0m and 15s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Flatrock in the next 16 days are 3.5m 15s and forecast to arrive on Tuesday (Sep 15) at 6AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Thursday (Sep 17) at 12AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Wed 16th Sep) | 10ft (3.0m) 15s |
| Best Surf | 6AM (Wed 16th Sep) | 10ft (3.0m) 15s |
| Most Powerful | 6AM (Tue 15th Sep) | 11ft (3.5m) 15s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright, this is Rusty, and I’m looking at the next 16 days for Flatrock. It’s a real tale of two outlooks, with some serious swell but a lot of wind to deal with before we get to the good stuff.
We start slow. The first few days are a bit of a bust. Saturday the 12th has some 6ft SW groundswell with a 15-second period, but the wind is messy, and the conditions are just marginal. Sunday and Monday are even worse with onshore winds, so you’re looking at a solid gap of about 5 days before anything worth paddling for.
The first real standout hits on Wednesday, September 16th. We’ve got a clean 10ft SW groundswell, with a 15-second period, and the wind is offshore from the East at 15 mph. That’s clean, powerful stuff. The combined energy is massive at 3887. This is expert territory – well over the 8ft mark – so it’s for the big dogs only. Flatrock is a reef break, and with that long-period groundswell, it’s going to be lined up and hollow. Crowds are “sometimes,” so you might have a few out, but the quality is undeniable.
After that, it drops off for a few days.
Tuesday, September 22nd is the one to plan around. This is the highlight of the whole forecast. We’re looking at an 11-12ft SW swell with a 16-second period, and the wind is offshore from the East at 15 mph. The combined energy reading hits a massive 5796 in the morning and 5335 in the afternoon. The forecast calls it “exceptional surf conditions for expert surfers,” and I’m not going to argue. This is big, clean, and powerful.
Then we get a little bonus. Thursday, September 24th into Friday, September 25th looks absolutely enormous. On the 24th, we have 7ft in the morning with glassy conditions, which is a dream. But the afternoon jumps to 11-12ft with a 21-second period – that’s an incredibly long period groundswell. The energy reading spikes to 9948. The wind is a light cross-on, which is a small knock, but the raw power is jaw-dropping. Friday holds similar size. This is for the hardcore big-wave crew only.
The final weekend turns ugly. Saturday the 26th and Sunday the 27th get blown out by gale-force onshore winds and heavy rain. On the 27th, the swell prediction is for a massive 21ft, but with the onshore wind, it’s just a washing machine. No good.
So, your best bets: Wednesday, September 16th for a solid, clean session, and Tuesday, September 22nd is the absolute standout for experts. If you’re looking for XXL groundswell, Thursday the 24th and Friday the 25th are incredible, but watch the wind direction.
Stay safe out there.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Sat night. Warm (max 22°C on Sat afternoon, min 12°C on Mon night). Winds increasing (light winds from the N on Sat afternoon, fresh winds from the WSW by Sun morning). | Days 4-6 Weather SummaryMostly dry. Very mild (max 16°C on Thu afternoon, min 9°C on Tue night). Winds decreasing (fresh winds from the SE on Tue night, light winds from the SW by Thu afternoon). | ||||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | |||||||||||||||
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 15 | SW 16 | SW 15 | SW 16 | SW 16 | SW 15 | SW 14 | SW 13 | SW 16 | SW 15 | SW 14 | SSW 15 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SW 17 | SW 16 | SW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1540 | 1806 | 844 | 1829 | 976 | 685 | 1067 | 760 | 1953 | 3865 | 3566 | 3682 | 3887 | 3750 | 2919 | 1676 | 1126 | 734 | 1235 | 729 | 412 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-off | on | on | on | cross-on | on | cross | cross-off | cross-off | cross-off | off | off | off | cross-off | cross-on | cross-off | cross | cross-on | cross-off |
High Tide | 1:08PM0.47m | 1:15AM0.49m | 1:19PM0.44m | 1:36AM0.53m | 1:28PM0.41m | 1:58AM0.55m | 1:35PM0.38m | 2:21AM0.55m | 1:40PM0.36m | 2:44AM0.52m | 1:41PM0.34m | 3:08AM0.48m | 1:32PM0.33m | ||||||||
Low Tide | 7:10PM0.04m | 7:25AM0.03m | 7:15PM0.01m | 7:50AM0.05m | 7:25PM-0.02m | 8:13AM0.08m | 7:36PM-0.03m | 8:33AM0.13m | 7:49PM-0.03m | 8:52AM0.17m | 8:02PM-0.02m | 9:06AM0.22m | 8:11PM0.00m | ||||||||
 | |  |  | |  |  | | | | |  | | | | | | | | | | |
 | 6:33 | — | — | 6:31 | — | — | 6:30 | — | — | 6:28 | — | — | 6:28 | — | — | 6:26 | — | — | 6:24 | — | — |
 | — | 6:16 | — | — | 6:16 | — | — | 6:17 | — | — | 6:19 | — | — | 6:20 | — | — | 6:20 | — | — | 6:21 | — |
mm | — | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 20 | 22 | 22 | 14 | 14 | 14 | 14 | 15 | 15 | 13 | 12 | 11 | 11 | 12 | 10 | 14 | 16 | 16 | 18 | 20 | 21 |
Feels °C | 14 | 18 | 17 | 8 | 9 | 12 | 11 | 12 | 11 | 6 | 5 | 4 | 5 | 7 | 5 | 12 | 14 | 10 | 12 | 17 | 17 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 16 | SW 15 | SW 16 | SW 16 | SW 15 | SW 14 | SW 13 | SW 16 | SW 15 | SW 14 | SSW 15 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SW 17 | SW 16 | SW 14 |
| kJ | 1540 | 1806 | 844 | 1829 | 976 | 685 | 1067 | 760 | 1953 | 3865 | 3566 | 3682 | 3887 | 3750 | 2919 | 1676 | 1126 | 734 | 1235 | 729 | 412 |
Swell 2 Height (m) Direction Period (s) | SW 18 | — | SW 18 | — | — | SSW 11 | SW 19 | SW 18 | S 9 | — | — | — | — | — | — | S 24 | E 4 | SW 18 | — | S 10 | NW 6 |
| kJ | 735 | — | 702 | — | — | 23 | 177 | 375 | 2 | — | — | — | — | — | — | 11 | 6 | 338 | — | 31 | 18 |
Swell 3 Height (m) Direction Period (s) | — | — | S 9 | — | — | — | SW 18 | S 10 | — | — | — | — | — | — | — | — | SW 21 | — | — | — | — |
| kJ | — | — | 15 | — | — | — | 215 | 17 | — | — | — | — | — | — | — | — | 18 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | N 4 | — | N 4 | — | W 5 | WSW 6 | — | — | — | — | — | — | — | — | E 4 | E 4 | — | ENE 3 | NNW 4 | NW 5 | — |
| kJ | 9 | — | 12 | — | 59 | 68 | — | — | — | — | — | — | — | — | 31 | 14 | — | 7 | 29 | 23 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 44 | 42 | 44 | 151 | 523 | 153 | 360 | 294 | 153 | 153 | 153 | 198 | 0 | 0 | 0 | 74 | 78 | 74 | 44 | 42 | 44 |
Best forecast wave conditions in Eyre Peninsula | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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Information about the Flatrock Surf forecast
The above surf forecast table for Flatrock provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Flatrock can be found by selecting the local surf guide option on the grey menu. Our Flatrock 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 (Flatrock) 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 Flatrock 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 Eyre Peninsula? If you are looking for accommodation near Flatrock, camping, hotels and holiday cottages in Eyre Peninsula, consider staying in Port Lincoln which is 49 km (30 miles) away.
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