Surf Forecasts:
Turtles surf forecast from 16 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 11AM (local time) - 10ft (3.0m), 17s period, WSW swell with cross-offshore winds.
- Most powerful swell: Tuesday 18 Aug, 5PM (local time) - 11ft (3.5m), 17s period, WSW swell with 6,138 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 2AM (local time) - 7ft (2.1m), 17s period with WSW swell.
Best Forecast Surf Conditions for Turtles this week:
The surf forecast for Turtles over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Aug 18) at 2AM. The primary swell is predicted to be 2.1m and 17s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Turtles in the next 16 days are 3.5m 17s and forecast to arrive on Tuesday (Aug 18) at 5PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Wednesday (Aug 19) at 8AM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Tue 18th Aug) | 7ft (2.1m) 17s |
| Best Surf | 11AM (Tue 18th Aug) | 10ft (3.0m) 17s |
| Most Powerful | 5PM (Tue 18th Aug) | 11ft (3.5m) 17s |
Table - best surf conditions forecast for Turtles over the next 16 days.
The Lowdown
Alright, surf is finally looking like it wants to show up around these parts. It's been a bit of a flat, blown-out mess, but there's a window of proper swell coming. We got a solid stretch of WSW groundswell pushing through, but the wind is going to be the story. It’s gonna be a game of picking the windows.
The first real standout is Tuesday, August 18th. That morning is the one to circle. We’ve got a solid 10ft of WSW groundswell hitting the reef at Turtles (Big Island), and the energy is strong, reading 5488. That's a lot of water moving. The wind is a light cross-offshore from the ESE at 9 mph, and the forecast is calling it clean. For a reef break like this, that combo is about as good as it gets. The swell direction is pretty much spot on for what Turtles wants. Now, this is a heavy wave. At 10ft on a reef, that's expert territory, full stop. It's not a day to be learning. It’s a proper, powerful, thick groundswell with a 17-second period, so there's plenty of energy and long lulls between sets, which can help with the paddle out. The water is currently 72°, which is about normal for this time of year.
Following that, the action doesn't stop. Wednesday morning, August 19th is still solid with 8ft of the same WSW swell, and another clean morning with a cross-off breeze from the SE. The energy is still strong at 3601, and the period is a fat 16 seconds. This is a fantastic option if Tuesday feels too heavy. It’s still big and powerful, but a touch more manageable. The quality looks high.
The other call is Saturday morning, August 22nd. The swell has eased a bit to 7ft but it's still a quality SW groundswell. The wind is the highlight here - a slight cross-offshore breeze from the SSE at just 3 mph. That is as glassy as it gets. The surf report is calling it excellent for experienced surfers, and I’d have to agree. It’ll be a lot cleaner and likely more user-friendly than the earlier days, even though the size is down. This might be the one for the more experienced punter who missed the earlier window. Consistency looks good, but the crowd factor is something to keep in mind, as it can get busy out there.
The rest of the period is pretty much a mixed bag of onshore winds and choppy conditions. The swell sticks around, but the wind just keeps bloody ruining it. The afternoons mostly turn to junk with fresh cross-onshore breezes. There are a couple of mornings, like Thursday, August 27th, that show early promise with a clean cross-off breeze and 6ft swell, but the onshores kick in hard in the afternoon. It's a similar story on the 29th and 30th - flashes of clean swell before the wind turns it to crap. The period from the 25th to the end of the month looks like you'll be fighting the chop more than surfing it. The second week looks more of the same, with these short, lumpy windows.
For the most part, expect moderate crowds if you get the good ones. If it's not clean, Turtles gets pretty messy anyway, and with that much cross-shore wind, you might be better off checking if the kites are out than paddling out for a beating.
Rusty
Short Range ForecastMostly dry. Warm (max 23°C on Tue afternoon, min 17°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Wed night. Warm (max 26°C on Fri afternoon, min 15°C on Wed night). Mainly fresh winds. | ||||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 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) | SW 13 | SW 13 | WSW 16 | WSW 16 | WSW 16 | WSW 17 | WSW 17 | WSW 17 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | WSW 17 | WSW 16 | WSW 16 | WSW 15 | SW 15 | WSW 14 | SW 14 | SW 14 | SW 14 |
Wave Graph | |||||||||||||||||||||
642 | 623 | 1397 | 1851 | 1706 | 2594 | 5488 | 6138 | 4717 | 3601 | 2845 | 2546 | 3769 | 3506 | 2900 | 2348 | 2010 | 1690 | 1761 | 1554 | 1170 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | on | cross-on | cross-off | cross-off | cross-on | cross-off | cross-off | cross | cross-off | cross-off | cross | cross-off | cross-off | cross | cross-off | cross-off | cross-on | cross |
High Tide | 12:14PM1.05m | 00:39AM1.17m | 12:53PM0.94m | 1:08AM1.19m | 1:30PM0.84m | 1:37AM1.19m | 2:06PM0.73m | 2:08AM1.16m | 2:44PM0.64m | 2:41AM1.10m | 3:34PM0.56m | 3:22AM1.05m | 6:02PM0.50m | 4:20AM0.99m | |||||||
Low Tide | 6:12PM0.23m | 6:54AM0.26m | 6:33PM0.29m | 7:37AM0.27m | 6:52PM0.34m | 8:21AM0.31m | 7:08PM0.39m | 9:10AM0.35m | 7:20PM0.43m | 10:15AM0.40m | 7:23PM0.47m | 12:16PM0.42m | 6:22PM0.50m | ||||||||
6:52 | — | — | 6:50 | — | — | 6:50 | — | — | 6:48 | — | — | 6:48 | — | — | 6:48 | — | — | 6:47 | — | — | |
— | 6:08 | — | — | 6:08 | — | — | 6:08 | — | — | 6:08 | — | — | 6:09 | — | — | 6:10 | — | — | 6:10 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | 3 | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 22 | 22 | 21 | 21 | 20 | 21 | 23 | 20 | 20 | 20 | 17 | 19 | 22 | 19 | 23 | 26 | 24 | 25 | 26 | 23 |
Feels °C | 17 | 18 | 19 | 19 | 18 | 18 | 19 | 22 | 18 | 16 | 17 | 13 | 14 | 18 | 13 | 19 | 23 | 19 | 23 | 22 | 18 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 13 | WSW 16 | WSW 16 | WSW 16 | WSW 17 | WSW 17 | WSW 17 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | WSW 17 | WSW 16 | WSW 16 | WSW 15 | SW 15 | WSW 14 | SW 14 | SW 14 | SW 14 |
642 | 623 | 1397 | 1851 | 1706 | 2594 | 5488 | 6138 | 4717 | 3601 | 2845 | 2546 | 3769 | 3506 | 2900 | 2348 | 2010 | 1690 | 1761 | 1554 | 1170 | |
Swell 2 Height (m) Direction Period (s) | SSW 5 | WSW 18 | — | — | W 20 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | WSW 18 |
14 | 243 | — | — | 290 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 107 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | W 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | 7 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | NW 3 | W 3 | W 4 | — | — | — | — | — | — | — | — | SSE 4 | S 4 | S 5 | — | — | SSW 3 | — | SW 3 | SSW 5 |
— | 1 | 6 | 12 | — | — | — | — | — | — | — | — | 16 | 40 | 27 | — | — | 6 | — | 5 | 54 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 241 | 500 | 503 | 251 | 1369 | 0 | 0 | 1269 | 25 | 25 | 521 | 424 | 241 | 241 | 541 | 7 | 424 | 25 | 0 | 1059 | 424 |
Best forecast wave conditions in North West WA | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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Information about the Turtles Surf forecast
The above surf forecast table for Turtles provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Turtles can be found by selecting the local surf guide option on the grey menu. Our Turtles 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 (Turtles) 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 Turtles 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.











