Surf Forecasts:
Flat Rocks Beach (WA) surf forecast from 18 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 5AM (local time) - 8ft (2.5m), 16s period, SW swell with glassy winds.
- Most powerful swell: Thursday 20 Aug, 8AM (local time) - 10ft (3.0m), 16s period, SW swell with 3,916 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 5AM (local time) - 8ft (2.5m), 16s period with SW swell.
Best Forecast Surf Conditions for Flat Rocks Beach (WA) this week:
The surf forecast for Flat Rocks Beach (WA) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 19) at 5AM. The primary swell is predicted to be 2.5m and 16s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Flat Rocks Beach (WA) in the next 16 days are 3.0m 16s and forecast to arrive on Thursday (Aug 20) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Wed 19th Aug) | 8ft (2.5m) 16s |
| Best Surf | 5AM (Wed 19th Aug) | 8ft (2.5m) 16s |
| Most Powerful | 8AM (Thu 20th Aug) | 10ft (3.0m) 16s |
Table - best surf conditions forecast for Flat Rocks Beach (WA) over the next 16 days.
Short Range ForecastMostly dry. Warm (max 23°C on Fri afternoon, min 13°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 21°C on Fri night, min 12°C on Sun night). Mainly fresh winds. | ||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | ||||||||||||||
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 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 14 | SW 16 | SW 16 | SW 14 | SW 14 | SW 13 | SW 15 | SW 14 | SW 13 |
Wave Graph  | |||||||||||||||||||
 kJ | 3589 | 2237 | 2120 | 3438 | 3525 | 3039 | 2653 | 2226 | 2083 | 1669 | 1163 | 1978 | 1055 | 736 | 706 | 746 | 1526 | 1255 | 744 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | glassy | cross-on | cross-off | cross-off | cross | cross-off | cross-off | cross | off | glassy | cross-on | cross | cross | cross-on | cross-off | glassy | cross-on | cross-off |
High Tide | 1:36AM0.59m | 2:11AM0.59m | 2:59AM0.59m | 4:10AM0.58m | 5:32AM0.59m | 6:39AM0.61m | |||||||||||||
Low Tide | 4:42PM0.17m | 4:11PM0.16m | 3:49PM0.14m | 3:50PM0.12m | 3:58PM0.10m | 4:06PM0.09m | |||||||||||||
 |  | | |  | |  | | | | | | | | | | | | | |
 | — | 6:50 | — | — | 6:48 | — | — | 6:48 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — |
 | 5:58 | — | 5:59 | — | — | 5:59 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 16 | 17 | 17 | 17 | 18 | 17 | 21 | 23 | 21 | 21 | 20 | 17 | 17 | 18 | 17 | 17 | 17 | 17 |
Feels °C | 14 | 15 | 15 | 15 | 14 | 14 | 12 | 17 | 19 | 18 | 21 | 17 | 12 | 12 | 13 | 11 | 16 | 13 | 13 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 15 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 14 | SW 16 | SW 16 | SW 14 | SW 14 | SW 13 | SW 15 | SW 14 | SW 13 |
| kJ | 3589 | 2237 | 2120 | 3438 | 3525 | 3039 | 2653 | 2226 | 2083 | 1669 | 1163 | 1978 | 1055 | 736 | 706 | 746 | 1526 | 1255 | 744 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | S 26 | SW 24 | SW 19 | SW 17 | — | — | SW 20 | SW 18 | SW 16 | — | — | — |
| kJ | — | — | — | — | — | — | — | 13 | 87 | 825 | 1074 | — | — | 137 | 383 | 746 | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | SSW 6 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | 31 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | SSW 6 | SSW 6 | SSW 6 | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 132 | 57 | 62 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 32 | 0 | 33 | 32 | 0 | 340 | 22 | 0 | 484 | 0 | 0 | 484 | 484 | 340 | 484 | 22 | 0 | 592 | 0 |
Best forecast wave conditions in North West WA | |||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||
Header Global | |||||||||||||||||||
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Information about the Flat Rocks Beach (WA) Surf forecast
The above surf forecast table for Flat Rocks Beach (WA) provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Flat Rocks Beach (WA) can be found by selecting the local surf guide option on the grey menu. Our Flat Rocks Beach (WA) 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 (Flat Rocks Beach (WA)) 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 Flat Rocks Beach (WA) 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.
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