Surf Forecasts:
Flatrock surf forecast from 14 Aug 2026:
- Best quality surf: Saturday 15 Aug, 9AM (local time) - 10ft (3.0m), 16s period, SW swell with offshore winds.
- Most powerful swell: Friday 21 Aug, 12PM (local time) - 11ft (3.5m), 15s period, SW swell with 5,732 kJ wave energy.
- Next surfable swell (1★+): Saturday 15 Aug, 9AM (local time) - 10ft (3.0m), 16s 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 15) at 9AM. The primary swell is predicted to be 3.0m and 16s 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 Friday (Aug 21) at 12PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 5s period and expected on Sunday (Aug 16) at 6AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Sat 15th Aug) | 10ft (3.0m) 16s |
| Best Surf | 9AM (Sat 15th Aug) | 10ft (3.0m) 16s |
| Most Powerful | 12PM (Fri 21st Aug) | 11ft (3.5m) 15s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright, this is Flatrock we're talking about, and it's a reef setup that's best for advanced surfers. The water temp is sitting at 59°F, which is pretty much bang on average for this time of year, so grab a spring suit and you'll be fine.
The pattern for the next couple of weeks is a big one. Saturday morning the 15th is already kicking off with a solid 10 ft SW groundswell, with a long 16-second period. The energy is massive (4128), and with a light offshore breeze from the ESE, it's gonna be clean. This is serious, expert-only stuff. The right direction is coming from the southwest, which is just what this spot wants.
Sunday the 16th is still pumping, with 7 ft to 7 ft SW swell, but the wind is picking up a bit to a moderate offshore. Still clean, but the energy is dropping a little (1947). Monday the 17th is a bit of a mixed bag – morning has a light offshore with 6 ft SW swell and plenty of energy (2040), but the afternoon gets a cross-offshore wind, which takes the shine off a bit.
Tuesday the 18th is when things start to get messy. The swell drops to 5 ft to 6 ft, and the wind goes cross-shore, making it choppy. The energy is moderate (1300-2049). Then we hit a real rough patch from Wednesday the 19th through to Friday the 21st. Strong onshore winds, fresh breezes, and the swell is either there but with poor conditions or just blown out. The energy is still high, but it's a write-off for surf. There's a few days of nothing much there.
We get a little reprieve Saturday the 22nd and Sunday the 23rd, but it's still marginal. The swell is back up to 12 ft, but the wind is cross or cross-onshore, so it's gonna be bumpy. The energy is very strong (5521-5793), but the quality isn't there for paddle surfing. For the kite surfers, this is where it gets interesting.
The end of the month is where the real standout is. Friday the 28th of August is shaping up to be the pick of the entire forecast. The morning is clean with a 7 ft SW groundswell, but the afternoon is where it's at. A 10 ft SSW swell with a 16-second period, and a moderate offshore wind from the east, creating very clean conditions. The energy is exceptional (6171). This is the one to circle.
The final weekend, the 29th and 30th, is a bit of a fade. The swell is still there, but the wind is variable and the energy is dropping. Still some clean conditions, but the size is backing off. Overall, the first week is a mix of solid but messy surf, with Friday the 28th being the absolute standout.
Rusty
Short Range ForecastMostly dry. Very mild (max 15°C on Sat morning, min 11°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Tue night. Very mild (max 19°C on Tue afternoon, min 13°C on Tue morning). Winds decreasing (strong winds from the N on Tue night, light winds from the NW by Thu morning). | ||||||||||||||||||||
Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | |||||||||||||||
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 16 | SW 15 | SW 14 | SW 14 | SSW 14 | SW 14 | SW 16 | SW 16 | SW 15 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 18 | SW 16 | SW 16 | SW 15 | SW 15 | SW 16 | SW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 4128 | 3241 | 2185 | 1929 | 1644 | 1138 | 1852 | 1738 | 1212 | 2018 | 1271 | 728 | 799 | 757 | 787 | 1943 | 1764 | 4530 | 3612 | 5578 | 4529 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | off | off | off | off | cross-off | cross-off | cross-off | cross | cross-on | on | on | on | cross-on | cross-on | cross-on | on | on | cross-on |
High Tide | 1:57PM0.50m | 2:01AM0.41m | 2:07PM0.46m | 2:27AM0.45m | 2:15PM0.42m | 2:55AM0.47m | 2:20PM0.39m | 3:24AM0.46m | 2:21PM0.36m | 3:55AM0.44m | 2:10PM0.34m | 4:32AM0.40m | 1:32PM0.34m | ||||||||
Low Tide | 8:12PM0.07m | 7:58AM0.05m | 8:17PM0.04m | 8:26AM0.09m | 8:27PM0.01m | 8:52AM0.13m | 8:39PM0.00m | 9:16AM0.19m | 8:52PM0.00m | 9:36AM0.24m | 9:04PM0.01m | 9:44AM0.30m | 9:08PM0.04m | ||||||||
 | |  | |  |  |  | |  | | |  |  | | | | | | | | | |
 | 7:09 | — | — | 7:07 | — | — | 7:07 | — | — | 7:05 | — | — | 7:05 | — | — | 7:03 | — | — | 7:01 | — | — |
 | — | 5:57 | — | — | 5:58 | — | — | 5:58 | — | — | 5:59 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 3 | 1 | — | — | — | — | — | — | 1 | — |
Temp °C | 15 | 15 | 14 | 15 | 14 | 13 | 14 | 15 | 13 | 17 | 19 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 13 |
Feels °C | 11 | 11 | 10 | 10 | 8 | 9 | 12 | 11 | 9 | 11 | 14 | 6 | 7 | 8 | 10 | 11 | 10 | 11 | 10 | 8 | 6 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 15 | SW 14 | SW 14 | SSW 14 | SW 14 | SW 16 | SW 16 | SW 15 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 16 | SW 16 | SW 15 | SW 14 | SW 16 | SW 16 |
| kJ | 4128 | 3241 | 2185 | 1929 | 1644 | 1138 | 1852 | 1738 | 1212 | 2018 | 1271 | 728 | 799 | 757 | 787 | 1943 | 1764 | 4530 | 3463 | 5578 | 4529 |
Swell 2 Height (m) Direction Period (s) | — | — | — | S 15 | S 10 | SSW 18 | S 10 | SW 21 | SW 19 | SE 10 | SE 10 | S 9 | — | SW 20 | SW 18 | SW 16 | — | — | SW 17 | — | — |
| kJ | — | — | — | 18 | 167 | 223 | 50 | 658 | 855 | 15 | 14 | 2 | — | 309 | 694 | 1438 | — | — | 2233 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | SW 26 | SW 23 | SSW 11 | SSE 10 | S 10 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | 26 | 138 | 37 | 65 | 8 | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | ESE 5 | ESE 4 | ESE 3 | — | — | — | N 3 | N 5 | N 4 | NW 4 | W 5 | W 5 | — | — | SW 16 | SW 15 | SW 16 | — |
| kJ | — | — | — | 32 | 20 | 7 | — | — | — | 8 | 15 | 9 | 12 | 17 | 12 | — | — | 3092 | 3612 | 3678 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 78 | 74 | 154 | 44 | 204 | 315 | 315 | 153 | 42 | 151 | 42 | 316 | 692 | 1120 |
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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