
Surf Forecasts:
Flatrock surf forecast from 17 Jul 2026:
- Best quality surf: Saturday 18 Jul, 9PM (local time) - 3.5ft (1.1m), 13s period, SW swell with cross-offshore winds.
- Most powerful swell: Thursday 23 Jul, 3AM (local time) - 10ft (3.0m), 15s period, SSW swell with 3,682 kJ wave energy.
- Next surfable swell (1★+): Saturday 18 Jul, 9PM (local time) - 3.5ft (1.1m), 13s 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 (Jul 18) at 9PM. The primary swell is predicted to be 1.1m and 13s period with a secondary swell of 0.5m and 6s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Flatrock in the next 16 days are 3.0m 15s and forecast to arrive on Thursday (Jul 23) at 3AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sat 18th Jul) | 3.5ft (1.1m) 13s |
| Best Surf | 9PM (Sat 18th Jul) | 3.5ft (1.1m) 13s |
| Most Powerful | 3AM (Thu 23rd Jul) | 10ft (3.0m) 15s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get straight into it.
We’ve got a tricky run coming up at Flatrock. The stretch ahead is a real mixed bag, with some solid pulses of swell but the wind is a constant battle. The first real surf worth talking about doesn’t show up until Saturday the 20th, with a few days of nothing but junk before that.
Overall Pattern
The week starts quiet. The first few days are a write-off; the wind is all over the place, making everything a chop-fest. The swell that does show up on Saturday the 18th is a clean 4ft SW groundswell with a solid 13-second period, but the wind is a moderate cross-off from the NNE, so it’s not completely on. It’s just enough to get the heart going, but the tide and conditions are questionable. The combined energy is weak (585), so it’s more of a paddle than a proper session.
Sunday the 19th is a complete no-go: 2ft of swell with a 19-second period sounds amazing, but it’s blown sideways by a 15 mph cross-shore. The energy is still weak (599), but the wind is the killer.
The First Real Window
Monday the 20th is where it starts to get interesting. The swell bumps up to 6ft from the SW, period at 15 seconds, and the combined energy is moderate (1311). The wind is a moderate cross-shore, so it’s a bit lumpy, but it’s the first time the numbers look half-decent. It’s marginal, but it’s a start.
Tuesday the 21st is the best of the first week. The morning shows 6ft SW swell, 13-second period, and the wind is a gentle cross-shore. The energy is moderate (1228). The afternoon gets a bit onshore, but the morning has a slight cross-chop, not a full-on mess. It’s not perfect, but it’s the cleanest we’re going to see for a while.
The Standout
Now, if you’re looking for the real magic, you’ve got to wait. Thursday the 30th of July is the absolute standout. The afternoon shows a massive 16ft SW swell, 14-second period, and the energy is off the charts at 17757, which is extremely strong. The wind is a gentle cross-shore, giving it that slight cross-chop. This is a full-on, big-wave day. The report says it’s too big for this break, so this is for experts only. The swell direction is a perfect match for Flatrock’s optimum SW direction. The water temp is about average for the time of year, so no surprises there.
The Long Range
The second week is a bit of a rollercoaster. Wednesday the 22nd is a mess with onshore winds. Thursday the 23rd shows a solid 8ft SSW swell with a 14-second period, and the energy is moderate-to-strong (2981), but the wind is onshore. It’s a promising swell, but the wind kills it.
The week of the 27th and 28th sees some big pulses from the SW, with the 28th showing a 10ft, 16-second period groundswell (3746 energy), but the wind is onshore and it’s a write-off.
The Final Call
Honestly, if you’re a paddler, the best bet is the morning of Tuesday the 21st for a solid, clean-ish session. The Thursday the 30th afternoon is the big one for experts, but only if you’re ready for a 16ft paddle. The rest of the window is a frustrating mix of solid swell and poor wind. It’s not a total washout, but it’s a test of patience.
Stay safe out there.
Rusty.
Short Range ForecastMostly dry. Very mild (max 16°C on Sat afternoon, min 13°C on Sat morning). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Tue night. Very mild (max 16°C on Mon night, min 13°C on Wed night). Wind will be generally light. | ||||||||||||||||||
Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | ||||||||||||||
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 13 | SW 13 | SW 13 | SW 19 | WSW 18 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 12 | SW 12 | SW 14 | SW 13 | SSW 15 | SSW 14 | SW 14 | SW 15 |
Wave Graph | |||||||||||||||||||
899 | 570 | 495 | 363 | 303 | 1859 | 1456 | 1271 | 1307 | 1595 | 1228 | 1036 | 503 | 733 | 837 | 3282 | 2981 | 2415 | 2962 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-on | cross-off | cross | cross-on | cross-off | cross | cross-on | cross | cross | cross-on | on | cross-on | on | cross-on | cross-on | on | cross-on |
High Tide | 2:06AM0.29m | 2:42PM0.49m | 2:43AM0.33m | 2:54PM0.44m | 3:23AM0.36m | 3:02PM0.40m | 4:08AM0.37m | 3:03PM0.36m | 4:59AM0.37m | 2:50PM0.33m | 6:14AM0.37m | 1:25PM0.32m | |||||||
Low Tide | 7:49AM0.05m | 9:14PM0.12m | 8:26AM0.09m | 9:21PM0.09m | 9:02AM0.15m | 9:34PM0.07m | 9:39AM0.21m | 9:51PM0.06m | 10:18AM0.26m | 10:08PM0.06m | 11:31AM0.32m | 10:24PM0.07m | |||||||
— | 7:31 | — | — | 7:31 | — | — | 7:31 | — | — | 7:30 | — | — | 7:30 | — | — | 7:28 | — | — | |
— | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:38 | — | — | 5:39 | — | — | 5:39 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | 1 | — | — | — |
Temp °C | 15 | 14 | 16 | 16 | 14 | 16 | 16 | 14 | 15 | 16 | 15 | 15 | 15 | 14 | 14 | 13 | 13 | 14 | 14 |
Feels °C | 11 | 8 | 13 | 12 | 8 | 12 | 12 | 9 | 11 | 13 | 11 | 12 | 13 | 11 | 11 | 9 | 10 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 13 | SW 13 | SW 13 | SW 12 | WSW 18 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 12 | SW 12 | SW 14 | SW 13 | SSW 15 | SSW 14 | SW 14 | SW 15 |
899 | 570 | 495 | 363 | 240 | 1859 | 1456 | 1271 | 1307 | 1595 | 1228 | 1036 | 503 | 733 | 837 | 3282 | 2981 | 2415 | 2962 | |
Swell 2 Height (m) Direction Period (s) | W 6 | WNW 6 | — | WNW 6 | SW 19 | S 10 | SSW 10 | S 10 | S 10 | S 10 | — | — | SW 14 | S 14 | SSW 18 | — | — | — | — |
17 | 12 | — | 20 | 303 | 55 | 20 | 8 | 17 | 7 | — | — | 211 | 4 | 32 | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | SSW 21 | SW 15 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | 45 | 33 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | N 3 | NW 5 | — | NW 4 | NW 6 | — | NW 4 | — | — | — | — | — | — | SSW 4 | — | — | — | — |
— | 3 | 13 | — | 23 | 96 | — | 32 | — | — | — | — | — | — | 16 | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 44 | 42 | 44 | 44 | 42 | 44 | 74 | 78 | 44 | 44 | 151 | 74 | 42 | 153 | 152 | 152 | 153 | 162 |
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.










