Surf Forecasts:
The Window surf forecast from 11 Aug 2026:
- Best quality surf: Thursday 13 Aug, 11AM (local time) - 11ft (3.5m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Tuesday 11 Aug, 5PM (local time) - 16ft (5.0m), 16s period, SW swell with 12,298 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 2AM (local time) - 11ft (3.5m), 15s period with SW swell.
Best Forecast Surf Conditions for The Window this week:
The surf forecast for The Window over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 13) at 2AM. The primary swell is predicted to be 3.5m and 15s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at The Window in the next 16 days are 5.0m 16s and forecast to arrive on Tuesday (Aug 11) 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 1.1m 5s period and expected on Sunday (Aug 16) at 2PM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Thu 13th Aug) | 11ft (3.5m) 15s |
| Best Surf | 11AM (Thu 13th Aug) | 11ft (3.5m) 16s |
| Most Powerful | 5PM (Tue 11th Aug) | 16ft (5.0m) 16s |
Table - best surf conditions forecast for The Window over the next 16 days.
The Lowdown
Alright mate, Rusty here. Let’s have a proper look at the Window.
The Window is a reef break for advanced surfers only, and it’s about to get absolutely thumped by a big, powerful SW groundswell. The water temp is sitting at 67°, which feels a touch warmer than normal for this time of year, so you might not need the thickest rubber.
Right out of the gate on Tuesday the 11th, we’ve got a serious swell hitting. Morning sees a 18ft SW groundswell with a 16-second period, pumping out a massive combined energy of 15270. That’s a serious amount of power. But, the wind is a strong cross-shore at 19 mph, and the report says “marginal surf” with lumpy conditions. That afternoon, the wind switches to a cross-on 16 mph, and the surf becomes a choppy 16ft with a score of zero. Honestly, Tuesday is a write-off for surfing; it’s just too messy and big.
Wednesday (12th) still has plenty of size with 13ft to 11ft and long periods of 14-15 seconds, but the wind stays cross-on at 9 mph. The energy is dropping to 6276, but it’s still big and fairly chopped up. Not worth paddling out.
Now, Thursday morning the 13th is where it gets interesting. The swell has backed off to a still-chunky 11ft from the SW with a super long period of 16 seconds. The wind has swung around to a light N at 3 mph, blowing cross-offshore. That’s clean. The report rates it “exceptional for expert surfers”, and the combined energy is still a solid 7410. This is the standout morning of the whole window. The sets will be long and powerful, perfect for the reef, but this is strictly for the experienced crew.
Friday the 14th keeps the quality high. Morning has a 11ft SW swell with a NE cross-off breeze at 9 mph, clean conditions, and combined energy of 5535. The afternoon is where you get the glass-off: a 10ft SW swell with glassy conditions and light wind. That afternoon is pure gold for a skilled surfer.
Saturday the 15th sees the swell start to drop, but an 8ft WSW groundswell with a clean NNE cross-off at 12 mph is still a fun morning session. The energy is down to 2613, but it’s clean.
Sunday the 16th looks okay in the morning with a 10ft WSW swell and a strong NE cross-off at 16 mph, keeping it clean. The energy bumps back up to 4093.
Monday the 17th and Tuesday the 18th are messy again with cross-on winds and lumpy, choppy conditions. Not worth it.
Wednesday the 19th is a total no-go. A massive 18ft swell hits, but it’s accompanied by a howling 28 mph onshore wind and dumping rain. The energy spikes to 14876, but it’s battered. This is a kite-surfing or foiling day for sure.
Thursday the 20th brings a return to clean conditions. An 11ft WSW swell with a light SSE cross-off breeze in the morning. Clean lines and reassuring energy of 5515. Solid.
Friday the 21st has an 11ft WSW swell with a NE cross-off all day, keeping it clean. The afternoon is especially tidy with light winds and an energy of 3447.
Saturday the 22nd is a classic. An 8ft WSW swell with a clean 12 mph offshore wind (ENE direction). This is proper, offshore conditions for the reef. Combined energy of 2105.
Sunday the 23rd is a bit of a wildcard. An 11ft to 13ft WSW swell rolls in, but it’s a long period groundswell from the WSW with a very long period of 18-19 seconds. The wind is a light cross-on. The energy hits 10292. The period is incredibly long, which means the waves will be very powerful and might break a bit straight at the beach, but on the reef at the Window, that long period translates to very deep, sucky barrels. It’s promising but less certain.
Monday the 24th onwards the forecast looks poor with strong to gale-force cross-on winds and rain. The surf is blown out or too messy. The last vaguely decent window is Sunday morning the 23rd, but it closes quickly.
Overall, the absolute best day on offer is Thursday morning, the 13th of August. The clean, cross-off wind on the powerful 11ft SW groundswell will have the Window looking proper. Keep an eye on Friday afternoon the 14th for a glassy session, too. The big stuff earlier in the week is just too unruly.
Rusty
Short Range ForecastMostly dry. Very mild (max 15°C on Tue night, min 12°C on Wed night). Winds decreasing (fresh winds from the SSW on Tue morning, calm by Wed night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 18°C on Sat afternoon, min 12°C on Fri morning). Wind will be generally light. | ||||||||||||||||||||
Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | |||||||||||||||
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 16 | SW 15 | SW 14 | SW 15 | SW 15 | SW 16 | SW 17 | SW 16 | SW 16 | SW 15 | SW 14 | WSW 14 | WSW 13 | WSW 13 | WSW 15 | WSW 14 | WSW 15 | WSW 17 | WSW 16 | WSW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 15270 | 12298 | 8096 | 6254 | 5659 | 6116 | 7410 | 8574 | 6984 | 5535 | 4462 | 3468 | 2613 | 1887 | 1321 | 4093 | 4050 | 3563 | 6450 | 6667 | 5521 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross-on | cross-on | glassy | cross-off | cross-on | cross-off | cross-off | glassy | off | cross-off | cross | cross-off | cross-off | cross | on | cross-on | cross-on | on |
High Tide | 8:35AM0.82m | 9:21AM0.80m | 10:02AM0.74m | 10:36AM0.65m | 1:03AM0.35m | 10:57AM0.54m | 00:36AM0.41m | 10:30AM0.44m | 00:25AM0.48m | 8:39AM0.39m | 00:24AM0.53m | ||||||||||
Low Tide | 5:41PM-0.03m | 6:16PM0.03m | 6:41PM0.12m | 6:45PM0.22m | 3:25AM0.34m | 6:04PM0.29m | 4:53AM0.36m | 5:04PM0.31m | 6:21AM0.38m | 4:13PM0.27m | |||||||||||
 |  |  | | | | | | | | | | | | | | | |  | | | |
 | 7:03 | — | — | 7:01 | — | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — | — | 6:58 | — | — | 6:56 | — | — |
 | — | 5:46 | — | — | 5:47 | — | — | 5:47 | — | — | 5:49 | — | — | 5:50 | — | — | 5:50 | — | — | 5:51 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 1 | — |
Temp °C | 14 | 14 | 15 | 14 | 14 | 14 | 13 | 14 | 14 | 14 | 16 | 16 | 17 | 18 | 17 | 16 | 18 | 18 | 17 | 17 | 16 |
Feels °C | 7 | 8 | 10 | 11 | 11 | 12 | 12 | 13 | 12 | 11 | 14 | 13 | 13 | 14 | 16 | 10 | 13 | 16 | 15 | 14 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 15 | SW 14 | SW 15 | SW 15 | SW 16 | SW 17 | SW 16 | SW 16 | SW 15 | SW 14 | WSW 14 | WSW 13 | WSW 13 | WSW 15 | WSW 14 | WSW 15 | WSW 17 | WSW 16 | WSW 16 |
| kJ | 15270 | 12298 | 8096 | 6254 | 5659 | 6116 | 7410 | 8574 | 6984 | 5535 | 4462 | 3468 | 2613 | 1887 | 1321 | 4093 | 4050 | 3563 | 6450 | 6667 | 5521 |
Swell 2 Height (m) Direction Period (s) | — | — | — | SW 24 | — | — | — | — | — | — | — | — | — | — | WSW 16 | — | — | SW 20 | — | — | — |
| kJ | — | — | — | 22 | — | — | — | — | — | — | — | — | — | — | 683 | — | — | 1567 | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | NNE 4 | N 5 | N 5 | N 4 | N 5 | N 5 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 19 | 62 | 17 | 41 | 64 | 19 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 76 | 15 | 15 | 3 | 3 | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 69 | 2 | 0 | 75 | 2 | 15 | 15 | 15 | 15 |
Best forecast wave conditions in Margaret River | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our The Window 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 The Window Surf forecast
The above surf forecast table for The Window provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at The Window can be found by selecting the local surf guide option on the grey menu. Our The Window 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 (The Window) 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 The Window 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.
The Window is 74 km (46 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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