Surf Forecasts:
Flatrock surf forecast from 16 Aug 2026:
- Best quality surf: Saturday 22 Aug, 9PM (local time) - 10ft (3.0m), 16s period, SW swell with glassy winds.
- Most powerful swell: Friday 21 Aug, 9PM (local time) - 13ft (4.0m), 16s period, SW swell with 7,714 kJ wave energy.
- Next surfable swell (1★+): Sunday 16 Aug, 12PM (local time) - 7ft (2.1m), 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 Sunday (Aug 16) at 12PM. The primary swell is predicted to be 2.1m and 14s period with a secondary swell of 0.9m and 12s. 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 16s and forecast to arrive on Friday (Aug 21) at 9PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 5s period and expected on Sunday (Aug 16) at 12PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Sun 16th Aug) | 7ft (2.1m) 14s |
| Best Surf | 9PM (Sat 22nd Aug) | 10ft (3.0m) 16s |
| Most Powerful | 9PM (Fri 21st Aug) | 13ft (4.0m) 16s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright, let’s get into it. The long-range charts are showing some life for Flatrock, but it ain't gonna be a straight shot to glory. We got a bumpy start, a proper window of clean power, and then it gets real messy before we might see something special right at the end of the run. It’s a reef setup, so when it’s on, it’s on, but you gotta pick your moments.
The whole window kicks off this morning with solid surf. We got 7.2ft of southwest groundswell at 14 seconds, and the east wind is holding it together. It’s showing as offshore and clean, with strong wave energy in the water, sitting at 1947. Water temp is 58.6°, which is about normal for this time of year, so no surprises there. This is proper Flatrock, but it's a heavy, advanced wave. The swell direction is right in the sweet spot for the reef, and it’s looking good for the experienced crew.
The surf settles a touch this afternoon, easing to 6.2ft, but it stays clean with that east offshore breeze. The energy drops a bit to 1679, but it’s still got push. Monday morning looks like the first real standout though. It’s 5.9ft of southwest swell, but the period jumps to 16 seconds. That’s proper groundswell, and with a gentle offshore east wind, it’s going to be glassy and lined up. The energy’s climbing too, up to 2079. This is the kind of morning you get the dawn patrol for. Monday afternoon stays clean but the wind goes cross-offshore and it gets a bit more average. It’s still surfable, but not the same quality.
Tuesday sees the wind go more cross-off and then cross-shore, and the period stays long at 16-17 seconds. The size is still around 5.2-5.9ft, but the quality is dropping. It’s not the same clean groomed lines. Wednesday is a write-off. The wind swings onshore and it’s blowing 30 km/h. The swell is dropping and it’s junky. Don’t bother. Thursday looks like it might clean up, with the swell picking back up to 6.6ft and the energy jumping to 2562, but the wind is cross-onshore. It’s a frustrating one – there’s size and power, but the wind is going to mess with the surface. It’s a marginal call.
Then it gets heavy. Friday the 21st is a big one, but not in a good way. The swell is going to jump to 11.5ft with a huge jump in energy – we’re talking over 12000 in the morning. That’s a lot of water moving. But the wind is howling onshore at 30-40 km/h. It’s going to be a complete, stormy mess. This is not a surf day; it’s a day to watch from the cliff. The following weekend, the 22nd and 23rd, still has big swell in the 9.8-11.5ft range, but the wind is still onshore or cross-onshore and it’s going to be lumpy. There’s energy, but no order to it. It’s more of a wrestling match than a surf. If that’s your thing, you do you, but it looks more like a kite-surfing setup than a paddle-surfing one.
After that, things start to settle. Monday the 24th looks promising. The swell drops back to a more manageable 8.2ft, but the wind goes light and cross-offshore from the southeast. The period is a solid 15 seconds and the energy is back up over 3000. This is looking like a clean, powerful day at Flatrock. The wind is light and the surface should be clean. That’s a proper window. Tuesday the 25th keeps the quality going. Swell is 7.2ft from the southwest, but the wind is a moderate offshore easterly. It’s clean again. We’re getting some good, solid waves to finish the month.
The 26th is a bit of a transition day. The swell drops out, but the period goes really long – 20-21 seconds. That’s very long period groundswell. It’s small, but for a reef like Flatrock, that long period could make for some very clean, well-shaped waves, even if they’re smaller. But it might also be breaking a little too straight. It’s worth checking. The 27th sees the size jump back up to 9.8ft, but the wind is cross-shore and lumpy. It’s a no-go.
Then we get to the final call. Friday the 28th is the other big standout. The wind is forecast to be completely glassy. Zero wind. The swell is a solid 7.
Short Range ForecastLight rain (total 2mm), mostly falling on Tue night. Very mild (max 18°C on Tue afternoon, min 12°C on Sun night). Winds increasing (light winds from the E on Mon morning, strong winds from the NNE by Tue night). | Days 4-6 Weather SummarySome drizzle, heaviest during Fri morning. Very mild (max 14°C on Wed morning, min 12°C on Thu night). Winds increasing (calm on Thu night, strong winds from the SW by Fri morning). | ||||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | |||||||||||||||
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 14 | SW 14 | SW 14 | SW 16 | SW 16 | SW 15 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 18 | SW 16 | SW 16 | SW 15 | SW 17 | SW 16 | SW 16 | SW 15 | SW 16 | SW 16 |
Wave Graph | |||||||||||||||||||||
1929 | 1512 | 1034 | 1707 | 1602 | 1308 | 1837 | 1271 | 737 | 962 | 757 | 791 | 1895 | 1634 | 2150 | 7283 | 6673 | 7520 | 3629 | 5748 | 4070 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | off | cross-off | cross-off | cross-off | cross | on | on | on | cross-on | cross-on | on | cross | on | cross-on | cross | cross-on | cross-on | cross-on |
High Tide | 2:07PM0.46m | 2:27AM0.45m | 2:15PM0.42m | 2:55AM0.47m | 2:20PM0.39m | 3:24AM0.46m | 2:21PM0.36m | 3:55AM0.44m | 2:10PM0.34m | 4:32AM0.40m | 1:32PM0.34m | 5:45AM0.35m | |||||||||
Low Tide | 8:17PM0.04m | 8:26AM0.09m | 8:27PM0.01m | 8:52AM0.13m | 8:39PM0.00m | 9:16AM0.19m | 8:52PM0.00m | 9:36AM0.24m | 9:04PM0.01m | 9:44AM0.30m | 9:08PM0.04m | 8:29AM0.35m | 8:57PM0.06m | ||||||||
7:07 | — | — | 7:07 | — | — | 7:05 | — | — | 7:05 | — | — | 7:03 | — | — | 7:01 | — | — | 7:01 | — | — | |
— | 5:58 | — | — | 5:58 | — | — | 5:59 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | |
mm | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — | 1 | — | — | — | — | — |
Temp °C | 15 | 15 | 13 | 15 | 15 | 13 | 16 | 18 | 16 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 12 | 11 |
Feels °C | 10 | 10 | 8 | 12 | 10 | 8 | 11 | 13 | 7 | 8 | 9 | 11 | 12 | 11 | 13 | 8 | 4 | 5 | 9 | 9 | 9 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 14 | SW 14 | SW 16 | SW 16 | SW 15 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 16 | SW 16 | SW 15 | SW 17 | SW 16 | SW 16 | SW 15 | SW 16 | SW 16 |
1929 | 1512 | 1034 | 1707 | 1602 | 1308 | 1837 | 1271 | 737 | 962 | 757 | 791 | 1895 | 1634 | 2150 | 7283 | 6673 | 7520 | 3629 | 5748 | 4070 | |
Swell 2 Height (m) Direction Period (s) | S 15 | S 10 | SSW 18 | S 10 | SSW 21 | SW 19 | SSE 10 | SSE 10 | ENE 4 | — | WSW 5 | SW 18 | SW 16 | SW 22 | SW 19 | — | — | SW 22 | SW 18 | — | — |
18 | 167 | 223 | 52 | 584 | 855 | 19 | 9 | 3 | — | 24 | 694 | 667 | 73 | 1351 | — | — | 119 | 1690 | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | SW 26 | SW 23 | S 11 | S 10 | — | — | — | — | SW 20 | WSW 7 | — | — | — | — | — | — | — | — | — |
— | — | 26 | 140 | 55 | 17 | — | — | — | — | 309 | 84 | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | ESE 4 | ESE 4 | SSE 11 | SSE 10 | ENE 4 | E 10 | N 5 | NNW 5 | W 4 | — | — | — | — | — | SW 17 | SW 16 | SW 16 | — | — | — |
— | 16 | 11 | 180 | 141 | 21 | 17 | 16 | 45 | 26 | — | — | — | — | — | 4749 | 4662 | 5218 | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 74 | 74 | 154 | 44 | 319 | 315 | 816 | 315 | 42 | 78 | 42 | 164 | 871 | 153 | 153 | 153 | 74 |
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.











