Surf Forecasts:
Gas Bay surf forecast from 25 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 2PM (local time) - 16ft (5.0m), 17s period, WSW swell with cross-shore winds.
- Most powerful swell: Wednesday 26 Aug, 2PM (local time) - 16ft (5.0m), 17s period, WSW swell with 15,162 kJ wave energy.
- Next surfable swell (1★+): Wednesday 26 Aug, 2PM (local time) - 16ft (5.0m), 17s period with WSW swell.
Best Forecast Surf Conditions for Gas Bay this week:
The surf forecast for Gas Bay over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 26) at 2PM. The primary swell is predicted to be 5.0m and 17s period. The wind is predicted to be cross-shore as the swell arrives.
The most powerful waves expected at Gas Bay in the next 16 days are 5.0m 17s and forecast to arrive on Wednesday (Aug 26) at 2PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.3m 7s period and expected on Tuesday (Aug 25) at 5PM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Wed 26th Aug) | 16ft (5.0m) 17s |
| Best Surf | 2PM (Wed 26th Aug) | 16ft (5.0m) 17s |
| Most Powerful | 2PM (Wed 26th Aug) | 16ft (5.0m) 17s |
Table - best surf conditions forecast for Gas Bay over the next 16 days.
The Lowdown
Alright, Rusty here. Let's look at what's cookin' for Gas Bay.
Straight up, we got a long period ahead with plenty of action, but you gotta pick your moments. The first few days are a write-off – Tuesday the 25th is just messy with strong cross-onshore winds and big, poor quality surf. The wave energy is huge (3166), but it ain't surfable. We are lookin' at a blank start, but don't worry, it changes.
The real fun kicks off Wednesday the 26th. We got a massive 16ft groundswell rollin' in from the WSW with a very long period of 18 seconds. The combined energy is 14437, which is intense. The wind is light and cross-shore in the mornin', turnin' clean by the afternoon. This is gonna be a big, powerful day. Because of the long period, those waves will jack up and hold shape, great for a reef like Gas Bay, but it'll be tricky. This is expert territory. The water is a touch warmer than normal at 66°F.
Thursday the 27th is still solid, with a 13ft SW swell, but winds are gettin' stronger. It stays clean with a cross-offshore breeze.
Friday the 28th sees the swell drop significantly, down to 8ft, and the wind is up. Not the best day.
Now, for the true standout, lock in Saturday the 29th afternoon. The swell is a solid 10ft from the SW with a period of 18 seconds, deliverin' 5861 energy. And the wind? Glassy offshore from the East. That's perfect. Clean, peelin' waves with a gentle offshore breeze – that's the gold standard for Gas Bay. This is the best on offer in the first week, and conditions are described as exceptional for experts.
Sunday the 30th is still rideable but the wind turns onshore and the quality drops.
We hit another lull until a new pulse arrives Wednesday the 2nd of September. 15ft groundswell from the SW on the 2nd afternoon with light onshore wind gives good energy (10484) but the wind ain't ideal.
The real second-week standout looks to be Monday the 7th of September. The mornin' is exceptional: 7ft swell with a massive 21-second period from the SW, light offshore breeze, and clean. That's a long-period groundswell at its finest, and with 6054 energy, it's got punch. Glassy, clean, and powerful. Then the afternoon gets even bigger at 15ft but the wind picks up. The mornin' session is your window.
Tuesday the 8th of September also looks fantastic. The afternoon is glassy again, with an 12ft SW swell. Exceptional conditions for experts.
Overall, if you want the absolute best, don't miss Saturday the 29th afternoon and Monday the 7th mornin'. The swell direction is a consistent WSW/SW which matches the optimum for Gas Bay perfectly. Get out there.
Rusty.
Short Range ForecastModerate rain (total 16mm), heaviest on Tue morning. Very mild (max 18°C on Tue afternoon, min 13°C on Wed afternoon). Winds decreasing (strong winds from the NW on Tue afternoon, light winds from the SSW by Wed morning). | Days 4-6 Weather SummaryMostly dry. Warm (max 20°C on Sat afternoon, min 11°C on Fri night). Winds decreasing (fresh winds from the SSE on Fri afternoon, calm by Sun night). | ||||||||||||||||||||
Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | |||||||||||||||
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) | WSW 14 | WSW 13 | WSW 15 | WSW 18 | WSW 17 | WSW 16 | SW 15 | SW 14 | SW 13 | SW 12 | SW 12 | SW 11 | SW 16 | SW 18 | SW 17 | SW 15 | WSW 15 | WSW 16 | WSW 17 | WSW 16 | WSW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2981 | 3314 | 6930 | 14437 | 14571 | 9888 | 6812 | 5020 | 2873 | 1710 | 822 | 497 | 2354 | 5861 | 6625 | 4250 | 3416 | 3156 | 3199 | 2936 | 4724 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | cross | cross-on | cross-off | on | on | cross-on |
High Tide | 8:10AM0.72m | 8:44AM0.73m | 9:16AM0.71m | 11:35PM0.34m | 9:46AM0.67m | 11:18PM0.38m | 10:15AM0.61m | 11:13PM0.43m | 10:41AM0.53m | 11:18PM0.50m | 10:59AM0.44m | 11:32PM0.56m | |||||||||
Low Tide | 5:02PM0.09m | 5:14PM0.12m | 5:21PM0.16m | 2:12AM0.33m | 5:22PM0.20m | 3:21AM0.31m | 5:18PM0.25m | 4:23AM0.31m | 5:08PM0.29m | 5:30AM0.31m | 4:45PM0.31m | ||||||||||
 | |  |  |  |  | |  |  |  | |  | | | | | | | | | | |
 | 6:48 | — | — | 6:47 | — | — | 6:46 | — | — | 6:43 | — | — | 6:43 | — | — | 6:41 | — | — | 6:39 | — | — |
 | — | 5:55 | — | — | 5:57 | — | — | 5:57 | — | — | 5:58 | — | — | 5:59 | — | — | 6:00 | — | — | 6:00 | — |
mm | 2 | 3 | 5 | — | 2 | 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 18 | 17 | 15 | 15 | 13 | 13 | 15 | 13 | 15 | 15 | 12 | 16 | 20 | 17 | 19 | 18 | 17 | 16 | 17 | 17 |
Feels °C | 11 | 12 | 11 | 13 | 12 | 8 | 6 | 8 | 8 | 9 | 9 | 7 | 13 | 18 | 15 | 18 | 16 | 18 | 14 | 13 | 14 |
Swell 1 Height (m) Direction Period (s) | WSW 14 | WSW 13 | WSW 15 | WSW 18 | WSW 17 | WSW 16 | SW 15 | SW 14 | SW 13 | SW 12 | SW 12 | SW 11 | SW 16 | SW 18 | SW 17 | SW 15 | WSW 15 | WSW 16 | WSW 17 | WSW 16 | WSW 16 |
| kJ | 2981 | 3314 | 6930 | 14437 | 14571 | 9888 | 6812 | 5020 | 2873 | 1710 | 822 | 497 | 2354 | 5861 | 6625 | 4250 | 3416 | 3156 | 3199 | 2936 | 4724 |
Swell 2 Height (m) Direction Period (s) | — | W 24 | WSW 22 | — | — | — | — | — | SW 21 | WSW 20 | SW 20 | SW 18 | SW 19 | — | — | — | — | — | — | — | — |
| kJ | — | 11 | 363 | — | — | — | — | — | 18 | 39 | 99 | 255 | 1337 | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | S 12 | S 12 | — | — | — | — | — | — | SW 26 | WSW 24 | SW 21 | — | — | — | — | — | — | — | — | — |
| kJ | — | 3 | 11 | — | — | — | — | — | — | 25 | 55 | 365 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NW 6 | NW 7 | NW 7 | — | — | — | — | SE 5 | — | SSE 6 | SSE 6 | SSE 6 | SE 5 | — | — | — | — | — | W 5 | WSW 7 | — |
| kJ | 185 | 480 | 210 | — | — | — | — | 65 | — | 134 | 146 | 57 | 55 | — | — | — | — | — | 106 | 482 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 209 | 241 | 190 | 14 | 14 | 18 | 1356 | 100 | 14 | 18 | 54 | 8 | 14 | 0 | 0 | 2 | 19 | 0 | 19 | 1687 | 19 |
Best forecast wave conditions in Margaret River | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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Information about the Gas Bay Surf forecast
The above surf forecast table for Gas Bay provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Gas Bay can be found by selecting the local surf guide option on the grey menu. Our Gas Bay 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 (Gas Bay) 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 Gas Bay 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.
Gas Bay is 96 km (60 miles) from the city of Bunbury. If you plan a holiday in Margaret River, look for hotels and other accommodation in Bunbury. Bunbury has rooms for a wide range of budgets as well as car hire and transport links.
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