Surf Forecasts:
Flatrock surf forecast from 19 Aug 2026:
- Best quality surf: Saturday 22 Aug, 9PM (local time) - 7.5ft (2.3m), 15s period, SW swell with cross-offshore winds.
- Most powerful swell: Tuesday 25 Aug, 6AM (local time) - 11ft (3.5m), 16s period, SW swell with 5,218 kJ wave energy.
- Next surfable swell (1★+): Saturday 22 Aug, 9PM (local time) - 7.5ft (2.3m), 15s 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 (Aug 22) at 9PM. The primary swell is predicted to be 2.3m and 15s period with a secondary swell of 1.4m and 19s. 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 3.5m 16s and forecast to arrive on Tuesday (Aug 25) 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+) | 9PM (Sat 22nd Aug) | 7.5ft (2.3m) 15s |
| Best Surf | 9PM (Sat 22nd Aug) | 7.5ft (2.3m) 15s |
| Most Powerful | 6AM (Tue 25th Aug) | 11ft (3.5m) 16s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Hey crew, Rusty here. Looking at what’s coming down the line for our zone. We got some solid swell on the horizon, but the first part of the run is a bust thanks to shitty wind. The good stuff comes later, so be patient.
The opening days, Wednesday the 19th through Tuesday the 25th, are pumping with swell—big, powerful groundswell from the southwest—but the wind is all wrong. The combined energy is up there at 4230 (very strong) on Wednesday morning, and it stays in the thousands for days. Problem is, it’s blowing onshore or cross-onshore from the west and northwest, gusting up to 25 mph. Makes for messy, choppy surf. Water is about 59°, normal for this time of year.
The one to circle on the calendar is Saturday, 29th August. After a rough week, everything clicks. Flatrock (reef) is looking prime for the experienced crew. We got a 7ft swell out of the SSW, with a clean 14-second period, but the headline is the offshore wind from the east at 16 mph. That’ll put a razor edge on the waves. The combined energy is a strong 2223. This is real groundswell—long period, tons of juice. Because it’s a reef, it’ll handle that long period, giving you well-shaped, powerful lines. Expect the lineup to be busy.
The afternoon session on the 29th is nearly as good, with a 8ft SSW swell and clean offshore wind from the east-southeast. Another beauty.
Sunday the 30th still has some juice. The morning offers a smaller 5ft SSW swell with clean cross-offshore wind from the east-northeast, so the waves will be tidy. The afternoon turns on too, with a 5ft S swell and clean offshore wind from the east. Both sessions are rated excellent for experienced surfers.
As we roll into September, the swell drops. Monday the 31st has 7ft SSW swell with a super-long 17-second period, but cross-off wind keeps it workable. By Wednesday the 2nd and Thursday the 3rd of September, we’re down to 4ft waves, but we get *gentle offshore* wind from the east and high teens of period. That’s clean, fun, long-period groundswell—perfect for the reef. The energy drops to a moderate range (around 615 to 553), so it’s mellow but quality.
Leave the kite at home; this is a paddle surfer’s party.
Rusty.
Short Range ForecastMostly dry. Very mild (max 15°C on Thu morning, min 12°C on Thu night). Winds decreasing (fresh winds from the W on Wed morning, light winds from the SW by Fri morning). | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Mon night. Very mild (max 15°C on Sun afternoon, min 11°C on Mon night). Winds increasing (light winds from the ESE on Sat night, fresh winds from the SSW by Mon afternoon). | ||||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 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) | WSW 15 | WSW 14 | SW 14 | SW 16 | SW 16 | SW 15 | SW 15 | SW 17 | SW 16 | SW 15 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 14 | SW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3075 | 2515 | 1895 | 2119 | 1347 | 3103 | 2516 | 3959 | 4136 | 3557 | 2919 | 2178 | 3294 | 2374 | 1212 | 810 | 1549 | 2235 | 3732 | 3278 | 1946 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | on | cross-off | cross-off | cross-on | cross | on | cross | cross-on | cross | cross | cross |
High Tide | 2:21PM0.36m | 3:55AM0.44m | 2:10PM0.34m | 4:32AM0.40m | 1:32PM0.34m | 5:45AM0.35m | 11:40AM0.42m | 11:50AM0.47m | 1:03AM0.20m | 12:07PM0.52m | 00:38AM0.23m | ||||||||||
Low Tide | 8:52PM0.00m | 9:36AM0.24m | 9:04PM0.01m | 9:44AM0.30m | 9:08PM0.04m | 8:29AM0.35m | 8:57PM0.06m | 8:21PM0.08m | 7:44PM0.09m | 4:42AM0.16m | 7:27PM0.08m | ||||||||||
 |  |  | |  | | | |  | | | | | |  |  | | | | | | |
 | 7:05 | — | — | 7:03 | — | — | 7:01 | — | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — | — | 6:58 | — | — |
 | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:02 | — | — | 6:02 | — | — | 6:04 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 2 | — | 3 | — | — | — |
Temp °C | 14 | 14 | 14 | 15 | 14 | 13 | 13 | 14 | 15 | 13 | 13 | 13 | 14 | 15 | 14 | 15 | 13 | 13 | 13 | 13 | 12 |
Feels °C | 6 | 8 | 9 | 10 | 10 | 10 | 10 | 10 | 12 | 12 | 11 | 12 | 10 | 11 | 11 | 12 | 7 | 8 | 7 | 7 | 7 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 19 | SW 14 | SW 16 | SW 16 | SW 15 | SW 15 | SW 17 | SW 16 | SW 15 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 14 | SW 13 | SW 16 | SW 15 | SSW 12 | SW 13 |
| kJ | 1155 | 303 | 1895 | 2119 | 1347 | 3103 | 2516 | 3959 | 4136 | 3557 | 2919 | 2178 | 3294 | 2374 | 1212 | 810 | 1102 | 521 | 930 | 2135 | 1946 |
Swell 2 Height (m) Direction Period (s) | — | SW 20 | SW 18 | — | SW 9 | SW 20 | SW 18 | — | S 26 | SW 24 | SW 21 | SW 19 | — | — | SW 21 | SW 19 | SW 18 | — | — | WSW 11 | S 12 |
| kJ | — | 192 | 702 | — | 345 | 634 | 1019 | — | 13 | 87 | 664 | 1255 | — | — | 18 | 184 | 379 | — | — | 1330 | 814 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 15 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 773 | — |
Wind waves Height (m) Direction Period (s) | WSW 15 | WSW 14 | — | W 10 | — | — | — | — | — | — | — | — | — | — | NW 4 | WNW 5 | SW 14 | SW 13 | SW 13 | SW 14 | — |
| kJ | 3075 | 2515 | — | 669 | — | — | — | — | — | — | — | — | — | — | 12 | 30 | 1549 | 2235 | 3732 | 3278 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 624 | 692 | 162 | 164 | 692 | 153 | 42 | 294 | 126 | 74 | 151 | 0 | 151 | 42 | 42 | 162 | 317 | 153 | 153 | 198 | 126 |
Best forecast wave conditions in Eyre Peninsula | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Flatrock surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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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