Surf Forecasts:
Flatrock surf forecast from 18 Sep 2026:
- Best quality surf: Monday 21 Sep, 9PM (local time) - 10ft (3.0m), 15s period, SSW swell with offshore winds.
- Most powerful swell: Monday 21 Sep, 3PM (local time) - 11ft (3.5m), 15s period, SSW swell with 4,888 kJ wave energy.
- Next surfable swell (1★+): Monday 21 Sep, 9PM (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 Monday (Sep 21) at 9PM. 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 3.5m 15s and forecast to arrive on Monday (Sep 21) at 3PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 3s period and expected on Sunday (Sep 20) at 12AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 21st Sep) | 10ft (3.0m) 15s |
| Best Surf | 9PM (Mon 21st Sep) | 10ft (3.0m) 15s |
| Most Powerful | 3PM (Mon 21st Sep) | 11ft (3.5m) 15s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
Short Range ForecastMostly dry. Warm (max 24°C on Sat afternoon, min 12°C on Sun night). Winds increasing (light winds from the NW on Fri afternoon, strong winds from the N by Sat night). | Days 4-6 Weather SummaryMostly dry. Warm (max 24°C on Wed afternoon, min 10°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | |||||||||||||||
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 17 | SSW 16 | SW 14 | SW 13 | SW 12 | SW 12 | SW 16 | SW 15 | SW 14 | SW 14 | SSW 15 | SSW 15 | SW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SW 13 | SW 13 | SW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1352 | 801 | 521 | 347 | 260 | 258 | 1101 | 940 | 2358 | 3761 | 4888 | 4033 | 3326 | 3238 | 2767 | 1538 | 1193 | 1065 | 933 | 821 | 572 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-off | cross | cross-on | cross-off | cross-on | on | cross | cross-off | cross-off | off | cross-off | cross-on | off | cross-off | cross-off | cross-on | cross-off | cross-off | off |
High Tide | 1:32PM0.33m | 3:32AM0.43m | 1:00PM0.33m | 4:01AM0.37m | 11:19AM0.40m | 1:54AM0.24m | 11:22AM0.45m | 00:28AM0.26m | 11:37AM0.49m | 00:10AM0.31m | 11:56AM0.51m | 00:15AM0.37m | |||||||||
Low Tide | 8:11PM0.00m | 9:08AM0.28m | 8:12PM0.03m | 8:14AM0.32m | 7:55PM0.06m | 7:17PM0.08m | 4:19AM0.23m | 6:45PM0.08m | 4:56AM0.16m | 6:31PM0.07m | 5:26AM0.10m | 6:30PM0.05m | |||||||||
 | |  | | | | |  |  | | | | | | |  | | | | | | |
 | 6:24 | — | — | 6:22 | — | — | 6:22 | — | — | 6:20 | — | — | 6:18 | — | — | 6:18 | — | — | 6:16 | — | — |
 | — | 6:21 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:23 | — | — | 6:24 | — | — | 6:24 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 20 | 21 | 21 | 24 | 24 | 17 | 15 | 14 | 12 | 12 | 11 | 15 | 16 | 17 | 22 | 24 | 18 | 16 | 18 | 21 |
Feels °C | 9 | 15 | 16 | 14 | 19 | 18 | 13 | 10 | 9 | 6 | 6 | 6 | 13 | 14 | 13 | 21 | 22 | 15 | 14 | 15 | 18 |
Swell 1 Height (m) Direction Period (s) | SSW 17 | SSW 16 | SW 14 | SW 13 | SW 12 | SW 12 | SW 16 | SW 15 | SSW 18 | SW 14 | SSW 15 | SSW 15 | SW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SW 13 | SW 13 | SW 13 |
| kJ | 1352 | 801 | 521 | 347 | 260 | 248 | 1101 | 940 | 399 | 3761 | 4888 | 4033 | 3326 | 3238 | 2767 | 1538 | 1193 | 1065 | 933 | 821 | 572 |
Swell 2 Height (m) Direction Period (s) | — | — | — | SW 20 | SW 18 | SW 18 | — | — | — | — | — | — | — | SW 15 | — | SW 15 | — | — | — | SW 18 | SW 16 |
| kJ | — | — | — | 97 | 161 | 258 | — | — | — | — | — | — | — | 1835 | — | 106 | — | — | — | 12 | 42 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | W 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | 15 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 4 | NW 5 | WNW 6 | NNW 4 | WNW 5 | N 3 | WNW 6 | W 5 | SW 14 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 21 | 37 | 28 | 29 | 34 | 11 | 66 | 90 | 2358 | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 164 | 151 | 44 | 151 | 42 | 204 | 884 | 884 | 153 | 198 | 152 | 0 | 74 | 126 | 0 | 0 | 0 | 42 | 0 | 152 | 0 |
Best forecast wave conditions in Eyre Peninsula | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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FREE! Surf-Forecast.com widget for your website
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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