Surf Forecasts:
Flatrock surf forecast from 15 Sep 2026:
- Best quality surf: Tuesday 22 Sep, 6PM (local time) - 10ft (3.0m), 16s period, SSW swell with offshore winds.
- Most powerful swell: Tuesday 22 Sep, 12PM (local time) - 10ft (3.0m), 17s period, SSW swell with 5,837 kJ wave energy.
- Next surfable swell (1★+): Wednesday 16 Sep, 9AM (local time) - 10ft (3.0m), 15s period with SSW 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 Wednesday (Sep 16) at 9AM. The primary swell is predicted to be 3.0m and 15s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Flatrock in the next 16 days are 3.0m 17s and forecast to arrive on Tuesday (Sep 22) at 12PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 4s period and expected on Thursday (Sep 17) at 12AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Wed 16th Sep) | 10ft (3.0m) 15s |
| Best Surf | 6PM (Tue 22nd Sep) | 10ft (3.0m) 16s |
| Most Powerful | 12PM (Tue 22nd Sep) | 10ft (3.0m) 17s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright, Rusty here, but I’ll switch to feet and miles for you.
First off, the surf window is open right now, but it’s a mixed bag. The real standout is Tuesday morning, September 22, at Flatrock. That’s the one to remember. We’ve got a solid 10ft SSW groundswell, with a long 16 second period, and clean fresh offshore wind out of the east. Combined swell energy is strong at 5999. That’s a powerful, clean line-up. It’s an exposed reef break, with the swell direction matching the optimum from the southwest, so expect some serious quality. But at this size, it’s advanced-only, and the reef bottom means you need to be on your game. Crowds are possible.
Here’s the day-by-day.
Wednesday, September 16: The morning is your best early look. 10ft SSW swell, 15 second period, offshore east wind at 25 km/h (15.5 mph). Combined energy is 4257. Water temp is 60°F, pretty normal for this time of year. The afternoon turns messy.
Thursday, September 17: Swell drops to 7ft, still a decent SSW groundswell with 14 second period, cross-off wind from the northeast at 15 km/h (9.3 mph). Energy is 1770. Clean, but nothing special. Afternoon gets a light cross-onshore breeze.
Friday, September 18: Swell down to 5ft in the morning, wind north at 30 km/h (18.6 mph) going cross-shore. Energy is 1471, but the period is very long at 17 seconds. Chop city. More of a windsurf day.
Saturday, September 19: Small and choppy. 3ft swell, 13 second period, cross-shore wind at 30 km/h (18.6 mph). Energy is 414. Not worth it.
Sunday, September 20: Swell bumps to 4ft with a 16 second period, but onshore west-northwest wind at 20 km/h (12.4 mph). Energy is 1338. Wind ruins it.
Monday, September 21: Pick-up to 7ft in the morning, cross-off wind from the southeast at 30 km/h (18.6 mph). Energy is 2854. Afternoon gets to 8ft with a 16 second period, cleaner. Decent but not a standout.
Tuesday, September 22: The day. Morning: 10ft SSW swell, 16 second period, fresh east offshore wind at 30 km/h (18.6 mph). Energy is 5999. That’s a bomb. Afternoon holds 11.5ft with same offshore wind. This is the pick. Experts only.
Wednesday, September 23: Swell still 7.5ft with 15 second period, but cross-shore north wind at 25 km/h (15.5 mph). Energy is 2290. Gone.
Thursday, September 24: Morning brings 4.5ft swell with 13 second period and almost glassy cross-off wind from the east-northeast at just 5 km/h (3.1 mph). Energy is 726. Clean and small. Good for a longboard.
Friday, September 25: Small: 3.5ft in the morning, very long 17 second period, but cross-shore wind at 20 km/h (12.4 mph). Energy is 1124. Messy.
Saturday, September 26: Big swell back: 10ft SW with a massive 19 second period in the morning, cross-offshore north wind at 35 km/h (21.7 mph). Energy is 6038. Huge but windy. Only for experts.
Sunday, September 27: Still big at 10ft with 17 second period, but onshore west wind at 25 km/h (15.5 mph). Energy is 4472. Washing machine.
Monday, September 28: Swell down to 6ft with 14 second period, light cross-onshore wind from the northwest at 5 km/h (3.1 mph). Energy is 1455. Small and bump
Short Range ForecastMostly dry. Warm (max 21°C on Fri night, min 9°C on Wed night). Winds increasing (light winds from the SE on Thu afternoon, fresh winds from the NNW by Fri morning). | Days 4-6 Weather SummaryMostly dry. Warm (max 25°C on Sat afternoon, min 10°C on Mon night). Mainly fresh winds. | ||||||||||||||||||||
Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 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) | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 16 | SW 17 | SSW 16 | SW 14 | SW 13 | SW 13 | SW 18 | SW 16 | SW 15 | SW 14 | SW 13 | SSW 16 | SSW 15 | SSW 16 | SSW 16 | SSW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 4257 | 4222 | 3241 | 1759 | 1222 | 1877 | 1450 | 801 | 453 | 295 | 265 | 312 | 823 | 695 | 2316 | 1569 | 3644 | 3733 | 4390 | 5728 | 3822 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | off | cross-off | cross-on | cross-off | cross | cross-on | cross-off | cross | cross-on | cross-off | on | on | cross | cross-off | cross-off | cross-off | off | off | off |
High Tide | 1:40PM0.36m | 2:44AM0.52m | 1:41PM0.34m | 3:08AM0.48m | 1:32PM0.33m | 3:32AM0.43m | 1:00PM0.33m | 4:01AM0.37m | 11:19AM0.40m | 1:54AM0.24m | 11:22AM0.45m | 00:28AM0.26m | |||||||||
Low Tide | 7:49PM-0.03m | 8:52AM0.17m | 8:02PM-0.02m | 9:06AM0.22m | 8:11PM0.00m | 9:08AM0.28m | 8:12PM0.03m | 8:14AM0.32m | 7:55PM0.06m | 7:17PM0.08m | 4:19AM0.23m | 6:45PM0.08m | |||||||||
 | |  | | | | | | | | | | |  |  | | | | | | | |
 | 6:28 | — | — | 6:26 | — | — | 6:24 | — | — | 6:22 | — | — | 6:22 | — | — | 6:20 | — | — | 6:18 | — | — |
 | — | 6:20 | — | — | 6:20 | — | — | 6:21 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:23 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 12 | 12 | 11 | 13 | 13 | 16 | 18 | 20 | 21 | 22 | 25 | 25 | 15 | 15 | 15 | 13 | 12 | 11 | 12 | 13 | 14 |
Feels °C | 7 | 6 | 7 | 11 | 10 | 10 | 10 | 15 | 16 | 15 | 20 | 19 | 11 | 10 | 10 | 7 | 5 | 5 | 5 | 6 | 7 |
Swell 1 Height (m) Direction Period (s) | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 16 | SW 17 | SSW 16 | SW 14 | SW 13 | SW 13 | SW 12 | SW 16 | SW 15 | SW 14 | SW 13 | SSW 16 | SSW 15 | SSW 16 | SSW 16 | SSW 16 |
| kJ | 4257 | 4222 | 3241 | 1759 | 1222 | 1877 | 1450 | 801 | 453 | 295 | 265 | 178 | 823 | 695 | 2316 | 1569 | 3644 | 3733 | 4390 | 5728 | 3822 |
Swell 2 Height (m) Direction Period (s) | — | — | — | S 24 | — | — | — | — | WNW 6 | SW 20 | SW 18 | SW 18 | SW 16 | WSW 8 | — | SSW 16 | — | — | SSW 18 | — | — |
| kJ | — | — | — | 11 | — | — | — | — | 18 | 97 | 161 | 312 | 443 | 37 | — | 559 | — | — | 1609 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | WSW 12 | — | — | SSW 16 | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 14 | — | — | 726 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | E 4 | — | — | — | NNW 4 | NW 5 | — | NNW 4 | NW 5 | NNW 4 | WSW 5 | WSW 6 | — | — | — | — | — | — | — |
| kJ | — | — | 6 | — | — | — | 21 | 25 | — | 22 | 31 | 40 | 58 | 111 | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 152 | 0 | 74 | 78 | 0 | 294 | 151 | 44 | 151 | 42 | 204 | 162 | 884 | 316 | 74 | 153 | 126 | 154 | 152 | 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.
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