
Surf Forecasts:
Flatrock surf forecast from 6 Sep 2026:
- Best quality surf: Monday 7 Sep, 9PM (local time) - 7.5ft (2.3m), 19s period, SW swell with offshore winds.
- Most powerful swell: Wednesday 9 Sep, 9AM (local time) - 13ft (4.0m), 19s period, SSW swell with 10,366 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 9PM (local time) - 7.5ft (2.3m), 19s 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 Monday (Sep 07) at 9PM. The primary swell is predicted to be 2.3m and 19s period with a secondary swell of 1.9m and 19s. The wind is predicted to be offshore 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 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 0.9m 4s period and expected on Thursday (Sep 10) at 9PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 7th Sep) | 7.5ft (2.3m) 19s |
| Best Surf | 9PM (Mon 7th Sep) | 7.5ft (2.3m) 19s |
| Most Powerful | 9AM (Wed 9th Sep) | 13ft (4.0m) 19s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
G’day, Rusty here. Flatrock is our only game in town this outlook, a solid reef setup that handles a decent lick of SW swell. The water temp’s sitting at 15°, about average for this time of year, so nothing wild there. First up, there’s nothing worth paddling out for until Tuesday the 8th, so you’ve got a couple of days to sit tight. Let’s break it down.
The first real chance kicks off Tuesday morning, September 8th. Swell’s coming in at 8 ft from the SW with a very long period of 17 seconds – that’s proper groundswell, and it’s packing strong energy (4043). This is prime for a reef like Flatrock, where those long lines will stand up nicely. Winds are light offshore from the ESE, so it’ll be clean. The water temp anomaly is only 0.4°, which is just about normal for the time of year. This is excellent for experienced surfers, and you’ll have the place to yourself if you’re early – crowds are only sometimes an issue. Tuesday afternoon gets a bit dicey with a southerly breeze picking up, so make the most of the morning. Wednesday the 9th sees the swell bumping up to 13 ft from the SSW, with a very long period of 19 seconds and massive energy (9897). This is big, well overhead, and only for experts. Winds are cross-off but strong, so it’ll be clean but tricky. Thursday the 10th offers a standout morning: 12 ft SSW swell with 16-second period, strong energy (5386), and offshore winds from the ESE. That’s clean, powerful, and exceptional for those who can handle it. Friday the 11th drops back to 7 ft, but winds swing cross-off from the NE, so it’s clean and more manageable. Saturday the 12th is a write-off with cross-shore chop and smaller swell. Sunday the 13th brings onshore wind and rain – forget it. Monday the 14th has some cross-shore chop on 7 ft swell, nothing flash. Then Tuesday the 15th morning looks promising again: 8 ft SW swell with 15-second period, light offshore from the ENE, and strong energy (3051). This is excellent for experienced surfers. Wednesday the 16th morning stays clean with light offshore winds and 7 ft swell, and Wednesday afternoon turns glassy – zero wind, 6 ft, and clean. That’s a sneaky good session for the more moderate crew. After that, from Thursday the 17th through Sunday the 20th, it’s messy: strong cross-onshore winds, lumpy conditions, and poor surf. The big standouts are Tuesday the 8th morning and Thursday the 10th morning for the advanced crew, with clean, powerful SW groundswell and offshore winds. For something a bit more mellow, Wednesday the 16th afternoon is glassy and clean. Keep an eye on Monday the 21st – the forecast is hinting at a massive 13 ft, 21-second SW groundswell with light cross-off winds and extreme energy (13835). That’s one for the books if it holds, but it’s a long way out, so stay tuned. No other breaks to mention; Flatrock is the only spot in the mix.
Rusty.
Short Range ForecastMostly dry. Very mild (max 14°C on Mon afternoon, min 11°C on Mon night). Winds increasing (light winds from the SE on Tue morning, strong winds from the SSE by Tue night). | Days 5-7 Weather SummaryMostly dry. Warm (max 21°C on Sat afternoon, min 10°C on Wed night). Winds decreasing (fresh winds from the SE on Wed night, light winds from the N by Fri morning). | ||||||||||||||||||
Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | ||||||||||||||
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 13 | SW 13 | SSW 14 | SW 18 | SW 17 | SW 16 | SW 16 | SSW 19 | SSW 18 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 16 | SSW 16 | SW 15 | SW 16 | SW 18 |
Wave Graph | |||||||||||||||||||
1261 | 841 | 990 | 4104 | 4043 | 3543 | 5793 | 10366 | 9109 | 7740 | 5672 | 4108 | 2625 | 2178 | 2330 | 2234 | 1133 | 1284 | 1591 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | off | off | off | cross-off | cross | cross-off | cross | cross-on | cross-off |
High Tide | 11:40AM0.50m | 1:53AM0.20m | 12:02PM0.53m | 00:52AM0.23m | 12:22PM0.55m | 00:39AM0.29m | 12:41PM0.53m | 00:43AM0.36m | 12:56PM0.51m | 00:57AM0.43m | 1:08PM0.47m | 1:15AM0.49m | |||||||
Low Tide | 7:45PM0.03m | 4:35AM0.18m | 7:30PM0.05m | 5:23AM0.12m | 7:19PM0.07m | 5:58AM0.06m | 7:12PM0.07m | 6:29AM0.03m | 7:09PM0.06m | 6:58AM0.02m | 7:10PM0.04m | ||||||||
— | 6:39 | — | — | 6:39 | — | — | 6:37 | — | — | 6:35 | — | — | 6:35 | — | — | 6:33 | — | — | |
6:13 | — | 6:13 | — | — | 6:14 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 13 | 14 | 12 | 12 | 12 | 13 | 12 | 12 | 11 | 13 | 13 | 12 | 16 | 16 | 17 | 19 | 21 | 21 |
Feels °C | 9 | 7 | 10 | 9 | 9 | 8 | 6 | 3 | 3 | 4 | 8 | 8 | 8 | 15 | 14 | 13 | 14 | 17 | 17 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 13 | SSW 14 | SW 18 | SW 17 | SW 16 | SW 16 | SSW 19 | SSW 18 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 16 | SSW 16 | SW 15 | SW 16 | SW 18 |
1261 | 841 | 990 | 4104 | 4043 | 3543 | 5793 | 10366 | 9109 | 7740 | 5672 | 4108 | 2625 | 2178 | 2330 | 2234 | 1133 | 1284 | 1591 | |
Swell 2 Height (m) Direction Period (s) | SW 22 | SW 21 | SSW 20 | SW 13 | — | — | — | — | — | — | — | SW 26 | SSW 24 | — | — | — | SSW 18 | S 10 | SSE 9 |
20 | 224 | 705 | 1191 | — | — | — | — | — | — | — | 26 | 58 | — | — | — | 578 | 49 | 30 | |
Swell 3 Height (m) Direction Period (s) | — | S 10 | S 9 | — | — | — | — | — | — | — | — | — | — | — | — | — | S 11 | — | — |
— | 17 | 40 | — | — | — | — | — | — | — | — | — | — | — | — | — | 108 | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | SSW 16 | SSE 7 | — | — | E 4 | — | — | E 5 | — | — | N 4 | NW 5 | NNW 6 |
— | — | — | — | — | — | 4678 | 353 | — | — | 26 | — | — | 15 | — | — | 15 | 6 | 25 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 74 | 126 | 152 | 0 | 0 | 698 | 153 | 1351 | 1720 | 152 | 0 | 0 | 0 | 74 | 152 | 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.










