Surf Forecasts:
Flatrock surf forecast from 9 Aug 2026:
- Best quality surf: Sunday 9 Aug, 9PM (local time) - 15ft (4.5m), 19s period, SW swell with cross-onshore winds.
- Most powerful swell: Monday 10 Aug, 9AM (local time) - 16ft (5.0m), 17s period, SW swell with 14,444 kJ wave energy.
- Next surfable swell (1★+): Sunday 9 Aug, 12PM (local time) - 7.5ft (2.3m), 16s 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 09) at 12PM. The primary swell is predicted to be 2.3m and 16s period with a secondary swell of 0.7m and 5s. Another secondary swell of 0.8m and 5s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Flatrock in the next 16 days are 5.0m 17s and forecast to arrive on Monday (Aug 10) at 9AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Sunday (Aug 16) at 9AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Sun 9th Aug) | 7.5ft (2.3m) 16s |
| Best Surf | 9PM (Sun 9th Aug) | 15ft (4.5m) 19s |
| Most Powerful | 9AM (Mon 10th Aug) | 16ft (5.0m) 17s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright, my friends, let's talk about the surf ahead for Flatrock. The forecast is looking mighty interesting, with a big pulse of southwest groundswell on the way. There's some real promise, but also some serious conditions to navigate.
The opening act is a bit of a write-off. Sunday and Monday are looking sloppy with strong cross-shore winds and rising, unruly swell. It's going to be a turbulent mess out there. Then Tuesday the 12th brings a monster – a huge southwest swell. The energy readings are strong to very strong. This one is going to be way too big for most, and strictly for the experts. It's going to be a wild, intimidating ocean.
The real gem of this whole window looks to be Friday the 14th. The wind is forecast to drop right out, leaving it glassy. Swell will be a solid 12ft from the southwest, with a long 16-second period. This is the kind of heavy, powerful surf that Flatrock (Southern Coast) is known for. A serious, expert-only session with quality and power. The energy will still be strong, but the clean conditions will make it epic.
After that, the winds turn offshore from the east, cleaning up the leftovers. Saturday the 15th and Sunday the 16th are looking great for experienced surfers. We're talking clean waves in the 8ft to 10ft range. The wind will be off, the surf has plenty of drive, and while the period shortens a bit, the quality will be excellent. The water temp is pretty much normal for the season, so nothing out of the ordinary there.
Early the next week, it settles down to a friendly, clean 6ft of swell with a longer period again. It won't have the same punch as the earlier days but offers some fun, clean waves for those looking for a more mellow session. But hold on, the winds start to get messy again by the 19th, and by the 20th, it deteriorates back into lumpy, onshore slop. The final days of the forecast period look poor, so get your surfs in while the getting is good.
So, the big one to circle on the calendar is Friday the 14th. Big, clean, and glassy, that's the standout. For a more manageable but still solid session, the weekend of the 15th and 16th is the pick for the experienced crew. Get out there and enjoy it while it lasts.
Rusty.
Short Range ForecastHeavy rain (total 24mm), heaviest during Sun afternoon. Very mild (max 15°C on Sun night, min 12°C on Sun night). Mainly near gales. | Days 4-6 Weather SummarySome drizzle, heaviest during Wed morning. Very mild (max 15°C on Thu night, min 13°C on Wed night). Winds decreasing (strong winds from the WSW on Wed morning, calm by Fri morning). | ||||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | |||||||||||||||
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 15 | SW 19 | SW 17 | SW 16 | SW 16 | WSW 14 | SW 18 | SW 16 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 16 | SSW 17 | SW 16 | SW 16 | SW 16 | SW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2061 | 4829 | 11289 | 14444 | 6165 | 3288 | 3484 | 2960 | 7847 | 13267 | 7564 | 9648 | 6399 | 6363 | 5324 | 6112 | 6731 | 5140 | 4181 | 3326 | 2144 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross-on | on | cross-on | cross | cross-on | cross-on | on | cross-on | cross-on | cross-on | on | on | glassy | cross-on | cross-off | off | off | off |
High Tide | 11:28AM0.50m | 12:06PM0.56m | 1:39AM0.14m | 12:38PM0.60m | 1:07AM0.18m | 1:05PM0.60m | 1:06AM0.23m | 1:27PM0.58m | 1:18AM0.29m | 1:44PM0.55m | 1:37AM0.36m | 1:57PM0.50m | 2:01AM0.41m | ||||||||
Low Tide | 8:33PM0.03m | 8:25PM0.03m | 4:35AM0.12m | 8:22PM0.05m | 5:35AM0.07m | 8:19PM0.08m | 6:18AM0.04m | 8:14PM0.09m | 6:55AM0.02m | 8:11PM0.09m | 7:28AM0.03m | 8:12PM0.07m | |||||||||
 |  |  |  | |  |  | |  | |  |  |  | |  | | | |  | | | |
 | 7:16 | — | — | 7:15 | — | — | 7:13 | — | — | 7:13 | — | — | 7:11 | — | — | 7:09 | — | — | 7:09 | — | — |
 | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:54 | — | — | 5:54 | — | — | 5:55 | — | — | 5:57 | — |
mm | 4 | 9 | 2 | — | — | 2 | 1 | 5 | 1 | 1 | — | — | — | — | — | — | — | — | 2 | — | — |
Temp °C | 14 | 14 | 15 | 12 | 13 | 14 | 15 | 14 | 13 | 14 | 14 | 14 | 13 | 14 | 15 | 15 | 15 | 14 | 13 | 14 | 13 |
Feels °C | 8 | 8 | 7 | 5 | 7 | 8 | 5 | 4 | 4 | 6 | 7 | 9 | 9 | 11 | 12 | 13 | 12 | 11 | 9 | 10 | 8 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 15 | — | SW 17 | SW 16 | SW 16 | WSW 14 | SW 18 | — | SW 17 | — | SW 16 | SW 16 | SW 16 | SW 15 | SW 16 | SSW 17 | SW 16 | SW 16 | SW 16 | SW 14 |
| kJ | 2061 | 3135 | — | 14444 | 6165 | 3288 | 3484 | 2960 | — | 13267 | — | 9648 | 6399 | 6363 | 5324 | 6112 | 6731 | 5140 | 4181 | 3326 | 2144 |
Swell 2 Height (m) Direction Period (s) | — | W 9 | — | — | — | SSE 7 | SSE 7 | — | — | — | — | — | — | SSW 18 | — | — | — | — | — | — | — |
| kJ | — | 533 | — | — | — | 35 | 5 | — | — | — | — | — | — | 2141 | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | SW 20 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 2334 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 5 | SW 15 | SW 19 | SW 17 | — | NW 4 | WNW 8 | WNW 8 | SW 16 | SW 17 | SW 16 | SW 16 | — | — | — | — | — | — | — | — | — |
| kJ | 33 | 4829 | 11289 | 8405 | — | 14 | 913 | 507 | 7847 | 8949 | 7564 | 6128 | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 151 | 42 | 485 | 816 | 977 | 162 | 692 | 881 | 1189 | 884 | 884 | 316 | 153 | 871 | 151 | 0 | 74 | 0 | 0 | 0 | 0 |
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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