Surf Forecasts:
Flatrock surf forecast from 18 Jul 2026:
- Best quality surf: Tuesday 21 Jul, 12AM (local time) - 7ft (2.1m), 14s period, SW swell with cross-offshore winds.
- Most powerful swell: Thursday 23 Jul, 6AM (local time) - 13ft (4.0m), 14s period, SW swell with 6,095 kJ wave energy.
- Next surfable swell (1★+): Tuesday 21 Jul, 12AM (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 Tuesday (Jul 21) at 12AM. The primary swell is predicted to be 2.1m and 14s period with a secondary swell of 0.2m and 10s. 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 4.0m 14s and forecast to arrive on Thursday (Jul 23) at 6AM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Tue 21st Jul) | 7ft (2.1m) 14s |
| Best Surf | 12AM (Tue 21st Jul) | 7ft (2.1m) 14s |
| Most Powerful | 6AM (Thu 23rd Jul) | 13ft (4.0m) 14s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright, let’s talk about what’s happening at Flatrock.
This is a reef break, so it’s for advanced surfers only. Water temp is about 60°F, which is totally normal for this time of year.
We’ve got a long stretch of nothing special coming up. The first real day to get excited about is Thursday, 23 July. That morning, a solid 13ft swell from the SW comes in with a 14-second period, packing serious energy (10,429). That’s a big, powerful groundswell. The wind is from the south at 12 mph, so it’s cross-shore with a bit of chop, but it’s the best on offer. At 13ft, this is strictly for experts only. Too big for anyone else.
Before that, from Sunday 19 July through Wednesday 22 July, it’s pretty marginal. Sunday morning, there’s a tiny 2ft SW swell with a 19-second period, but the wind is a messy cross-shore at 16 mph, and I’d call it poor. The energy is low (607). Not worth it.
Monday 20 July picks up to 6ft to 7ft, but the wind stays cross or cross-onshore, so it’s choppy and lumpy. Tuesday 21 July is similar, with a 6ft swell but still cross-shore wind. The energy is moderate (1,228). Not a standout.
Wednesday 22 July gets worse — winds from the SW at 19 mph, cross-onshore, and the swell is 7ft to 8ft. It’s messy and blown out. Not for surfing.
After Thursday’s big pulse, things drop off but stay big. Friday 24 July through Sunday 26 July sees 8ft to 10ft SW swell, but the wind is onshore or cross-onshore, so it’s poor. The energy is high (2,354 to 5,196), but the conditions are just not clean. This is more of a kite-surfing setup than a paddle-surfing one.
The following week (27 July onward) fades. Monday 27 July has small 5ft swell with cross-shore wind, but it’s just marginal. Tuesday 30 July has a 5ft swell with a 15-second period, but the wind is a fresh cross-shore at 19 mph, making things lumpy. Really, after Thursday 23 July, there’s nothing that stands out as a must-surf session.
The last few days of the window (1 to 3 August) show some big swell again — 10ft to 12ft on 3 August — but with onshore wind and energy readings over 5,000, it’s going to be a mess. Not for the faint of heart.
So, the real highlight is Thursday morning, 23 July, with that big 13ft SW groundswell. It’s a one-off, expert-only, and well worth the wait if you’ve got the skills. The rest of the window is mostly a write-off, with patchy, wind-affected surf.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Tue night. Very mild (max 16°C on Sun afternoon, min 13°C on Sun morning). Winds increasing (light winds from the N on Mon night, strong winds from the SW by Tue night). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Wed afternoon. Very mild (max 14°C on Fri night, min 11°C on Wed night). Mainly fresh winds. | ||||||||||||||||||||
Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | |||||||||||||||
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 19 | SW 18 | SW 16 | SW 15 | SW 15 | SW 14 | SW 13 | SW 13 | SW 12 | SW 13 | SW 12 | SW 14 | SW 14 | SSW 16 | SW 15 | SW 15 | SW 14 | SSW 14 | SSW 13 | SW 13 | SW 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 303 | 1227 | 1591 | 1377 | 1915 | 1632 | 1228 | 1052 | 568 | 1482 | 1468 | 5726 | 5694 | 5355 | 4250 | 2963 | 2554 | 2925 | 2323 | 3118 | 2124 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross-on | cross-off | cross | cross-on | on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | on | on | on | on | cross-on | cross-on |
High Tide | 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 | 9:36AM0.38m | 11:03AM0.43m | ||||||||||
Low Tide | 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 | 10:29PM0.09m | 9:39PM0.11m | ||||||||||
 | |  |  | | | | |  |  |  |  | | |  | | | |  | | | |
 | 7:31 | — | — | 7:31 | — | — | 7:30 | — | — | 7:30 | — | — | 7:28 | — | — | 7:28 | — | — | 7:28 | — | — |
 | — | 5:37 | — | — | 5:37 | — | — | 5:38 | — | — | 5:39 | — | — | 5:39 | — | — | 5:40 | — | — | 5:42 | — |
mm | — | — | — | — | — | — | — | — | 2 | — | 1 | 1 | — | — | — | — | — | — | 2 | 1 | 3 |
Temp °C | 13 | 16 | 16 | 14 | 15 | 15 | 15 | 15 | 16 | 13 | 13 | 12 | 11 | 11 | 12 | 12 | 12 | 14 | 14 | 14 | 14 |
Feels °C | 7 | 12 | 12 | 9 | 11 | 12 | 11 | 11 | 12 | 5 | 5 | 5 | 5 | 6 | 7 | 6 | 6 | 9 | 9 | 9 | 10 |
Swell 1 Height (m) Direction Period (s) | SW 12 | SW 18 | SW 16 | SW 15 | SW 15 | SW 14 | SW 13 | SW 13 | SW 12 | SW 13 | SW 14 | SW 14 | SW 14 | SSW 16 | SW 15 | SW 15 | SW 14 | SSW 14 | SSW 13 | SW 13 | SW 12 |
| kJ | 240 | 1227 | 1591 | 1377 | 1915 | 1632 | 1228 | 1052 | 568 | 984 | 384 | 5726 | 5694 | 5355 | 4250 | 2963 | 2554 | 2925 | 2323 | 3118 | 2124 |
Swell 2 Height (m) Direction Period (s) | SW 19 | S 10 | SSW 10 | S 10 | S 10 | S 10 | — | — | SW 14 | — | — | — | SSW 18 | — | — | — | — | — | WSW 18 | — | — |
| kJ | 303 | 55 | 20 | 8 | 8 | 7 | — | — | 206 | — | — | — | 688 | — | — | — | — | — | 31 | — | — |
Swell 3 Height (m) Direction Period (s) | SW 15 | — | S 10 | — | — | — | — | — | S 14 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 33 | — | 52 | — | — | — | — | — | 4 | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 4 | NW 6 | NW 7 | NW 5 | — | — | — | NW 4 | WNW 5 | SW 13 | SW 12 | SSW 14 | SW 14 | — | — | — | — | — | — | SW 13 | SW 12 |
| kJ | 31 | 72 | 100 | 51 | — | — | — | 6 | 37 | 1482 | 1468 | 3815 | 4047 | — | — | — | — | — | — | 2078 | 1493 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 44 | 42 | 44 | 151 | 78 | 0 | 44 | 151 | 162 | 881 | 894 | 901 | 153 | 1121 | 238 | 238 | 1341 | 884 | 1206 | 698 | 153 |
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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