
Surf Forecasts:
Flatrock surf forecast from 4 Sep 2026:
- Best quality surf: Saturday 5 Sep, 6PM (local time) - 16ft (5.0m), 14s period, SW swell with onshore winds.
- Most powerful swell: Wednesday 9 Sep, 12PM (local time) - 13ft (4.0m), 19s period, SSW swell with 10,587 kJ wave energy.
- Next surfable swell (1★+): Saturday 5 Sep, 6PM (local time) - 16ft (5.0m), 14s period with SW 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 Saturday (Sep 05) at 6PM. The primary swell is predicted to be 5.0m and 14s period with a secondary swell of 3.5m and 14s. The wind is predicted to be onshore as the swell arrives.
The most powerful waves expected at Flatrock in the next 16 days are 4.0m 19s and forecast to arrive on Wednesday (Sep 09) at 12PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Wednesday (Sep 09) at 6AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Sat 5th Sep) | 16ft (5.0m) 14s |
| Best Surf | 6PM (Sat 5th Sep) | 16ft (5.0m) 14s |
| Most Powerful | 12PM (Wed 9th Sep) | 13ft (4.0m) 19s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright, surf is gonna be a bit of a mixed bag over the next couple of weeks. We’ve got a slow start, but there are a couple of windows that are gonna be proper, especially for the more experienced crew. The first few days are gonna be a write-off, so don't get too keen.
The first real opportunity doesn't show up until the 7th. Those early days of big, lumpy, onshore slop just aren't doing it for us at Flatrock. You're looking at 11.5ft to 13ft of junky swell with strong winds all over it. That’s not surfable, that's just a washing machine. The combined energy is moderate at best in that 4000-5000 (5088, 4142, 4947) range but it's all for nothing with that wind. It’s better to just sleep in.
Then, we get a shift. On the 7th, the wind swings offshore and stays clean for a good stretch. The swell drops to something more manageable, around 5.2ft, and that's when Flatrock starts to wake up. The energy is still fairly weak, down in the three-digit range (1095, 1625), but it's clean with a good SW direction. This is your pick for the first part of the week. Monday (7th) and Tuesday (8th) morning look like the best of it. Tuesday morning, there's a bump in size to 8.2ft from the SW with a 17-second period and the energy jumps up over 3800 (3805). That's proper groundswell, and with light offshore winds it should be holding some nice lines. This is a big, powerful reef at this size, so it's one for the experienced surfers only.
The middle of the week gets a bit hairy. Wednesday (9th) brings a big jump in size, up to 11.5ft to 13ft with a long 19-second period. The energy is huge, pushing 13989 on Wednesday morning. The winds are offshore, so it'll be clean, but this is serious, heavy water and only for the experts. It's a bit of a beast, that one. Thursday (10th) holds in at 11.5ft in the morning before coming down a bit to 9.8ft in the afternoon. The energy is still in the 6000s (6694, 5181) and the winds are offshore and clean. It stays big and powerful through this period.
By the 11th, the swell eases off to a nice 7.5ft and the energy settles down too (2202). The wind is still offshore, making it clean and lined up. This is a much more user-friendly size than the last couple of days, but even so, 7.5ft on a reef is still a serious wave. The good conditions look to hang around for the 12th. Friday (11th) is probably your best all-round day for cleanliness and power.
The weekend of the 12th and 13th sees the swell ease off a little more, but the winds get a bit tricky. The glassy conditions on Saturday afternoon with a 4.6ft SW swell and an 18-second period look dreamy, but the crowd might be out. It’s a good one, but there’s not a ton of size. Sunday turns a bit average with stronger, more cross-shore winds.
The following week starts with a flat spell. The 14th is virtually dead, just dribbles of energy. It’s a blank run for a couple of days. But then, around the 16th, there's some promise with a clean offshore 7.5ft swell, but the energy is only moderate. It’s more of a decent surf than a standout.
The real standouts, though, are the 18th and 19th. On the 18th, it jumps back up to 13ft. Friday afternoon the 18th is looking glassy as hell with a 13ft SW groundswell and the energy is over 6000 (6347) and building. That’s going to be epic. Then Saturday the 19th keeps it firing, with 13ft of swell and the energy in the 8000s (8316). The wind is light and cross-on on Saturday arvo, which isn't perfect, but with that much power, it'll still be firing. This is the big finale of the run, the one to really keep an eye on, but it's a long way off, so treat it as promising but not set in stone.
All in all, get on it from the 7th to the 12th, and if you’re an expert, clear your calendar for the 18th and 19th. Stay stoked.
Short Range ForecastMostly dry. Very mild (max 18°C on Fri afternoon, min 12°C on Sat morning). Winds decreasing (near gales from the W on Fri night, light winds from the SW by Sun morning). | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Tue afternoon. Very mild (max 14°C on Mon afternoon, min 9°C on Wed night). Winds increasing (light winds from the W on Tue morning, strong winds from the SSE by Tue night). | |||||||||||||||||||
Fri 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | ||||||||||||||
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 15 | SW 12 | SW 13 | SW 14 | SW 14 | SW 14 | SW 13 | SSW 13 | SW 14 | SW 18 | SW 17 | SW 16 | SSW 16 | SW 19 | SSW 18 | SSW 17 | SSW 16 | SSW 16 | SSW 15 |
Wave Graph | ||||||||||||||||||||
5069 | 3308 | 4142 | 4947 | 5087 | 3369 | 2570 | 1367 | 875 | 893 | 3914 | 3805 | 3216 | 3971 | 8450 | 9402 | 8486 | 6694 | 5155 | 3243 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross-off | off | off | off | off | cross-off | cross | cross-off | cross-off | cross-off | off | off | off |
High Tide | 4:29AM0.42m | 11:20AM0.44m | 11:40AM0.50m | 1:53AM0.20m | 12:02PM0.53m | 00:52AM0.23m | 12:22PM0.55m | 00:39AM0.29m | 12:41PM0.53m | 00:43AM0.36m | ||||||||||
Low Tide | 8:21PM-0.01m | 9:26AM0.36m | 8:15PM-0.00m | 8:01PM0.01m | 7:45PM0.03m | 4:35AM0.18m | 7:30PM0.05m | 5:23AM0.12m | 7:19PM0.07m | 5:58AM0.06m | 7:12PM0.07m | |||||||||
— | — | 6:43 | — | — | 6:41 | — | — | 6:39 | — | — | 6:39 | — | — | 6:37 | — | — | 6:35 | — | — | |
6:10 | — | — | 6:12 | — | — | 6:13 | — | — | 6:13 | — | — | 6:14 | — | — | 6:15 | — | — | 6:15 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — | — | — | — | — | — | — |
Temp °C | 18 | 16 | 13 | 13 | 13 | 13 | 13 | 12 | 14 | 14 | 12 | 13 | 12 | 13 | 12 | 12 | 10 | 12 | 12 | 11 |
Feels °C | 12 | 11 | 3 | 5 | 8 | 11 | 11 | 8 | 10 | 10 | 8 | 11 | 9 | 7 | 2 | 2 | 2 | 7 | 7 | 7 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 15 | — | — | SW 14 | SW 14 | SW 14 | SW 13 | SSW 13 | SW 14 | SW 18 | SW 17 | SW 16 | SSW 16 | SW 19 | SSW 18 | SSW 17 | SSW 16 | SSW 16 | SSW 15 |
5069 | 3308 | — | — | 5087 | 3369 | 2570 | 1367 | 875 | 893 | 3914 | 3805 | 3216 | 3971 | 8450 | 9402 | 8486 | 6694 | 5155 | 3243 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | WSW 16 | WSW 12 | SW 22 | SW 21 | SSW 20 | SW 13 | — | — | — | SSW 20 | — | — | — | SW 26 | SSW 24 |
— | — | — | — | — | 691 | 784 | 20 | 220 | 705 | 1109 | — | — | — | 5227 | — | — | — | 26 | 58 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | SSW 9 | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | 27 | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | NNW 4 | WNW 5 | SW 12 | SW 13 | — | — | — | — | SE 4 | — | — | — | — | SSE 4 | S 7 | — | — | — | ESE 5 | E 5 |
19 | 117 | 4142 | 4947 | — | — | — | — | 16 | — | — | — | — | 31 | 312 | — | — | — | 39 | 49 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 204 | 881 | 1177 | 1339 | 198 | 74 | 153 | 126 | 0 | 0 | 0 | 0 | 126 | 153 | 1339 | 1206 | 152 | 152 | 0 | 152 |
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.










