Surf Forecasts:
The Window surf forecast from 15 Sep 2026:
- Best quality surf: Monday 21 Sep, 2AM (local time) - 11ft (3.5m), 15s period, SW swell with offshore winds.
- Most powerful swell: Saturday 19 Sep, 11AM (local time) - 15ft (4.5m), 14s period, WSW swell with 7,442 kJ wave energy.
- Next surfable swell (1★+): Wednesday 16 Sep, 2PM (local time) - 6ft (1.8m), 13s 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 Wednesday (Sep 16) at 2PM. The primary swell is predicted to be 1.8m and 13s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at The Window in the next 16 days are 4.5m 14s and forecast to arrive on Saturday (Sep 19) at 11AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Friday (Sep 18) at 11AM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Wed 16th Sep) | 6ft (1.8m) 13s |
| Best Surf | 2AM (Mon 21st Sep) | 11ft (3.5m) 15s |
| Most Powerful | 11AM (Sat 19th Sep) | 15ft (4.5m) 14s |
Table - best surf conditions forecast for The Window over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's coming our way.
We're kicking things off on Wednesday the 16th at The Window. It's a reef break, advanced level, and it's exposed to that SW swell which is exactly what it wants. The water's sitting at about 64°, which is pretty normal for this time of year, nothing weird there. Days one and two are actually okay. The Wednesday morning session has a clean 6ft SW swell rolling in from the south-west with a solid 13-second period. The wind is a cross-offshore breeze, keeping things tidy. The combined energy is a solid moderate 1299. Then Wednesday afternoon drops a touch to 5ft, but the wind goes almost glassy with a slight air, making for very good surf. That afternoon is the pick of this early window.
However, we hit a rough patch. From Thursday the 17th morning right through to Sunday the 20th afternoon, it's a messy story. The wind goes onshore or cross-shore with strong breezes, and the swell gets big and unruly. By Friday the 18th, we're looking at a 15ft monster from the NW with a short, weak 9-second period and a near gale. That's a kite-surfing show, not a paddle-in session.
Sunday the 20th through to Wednesday the 23rd is a bit of a wasteland. The swell stays big, between 8ft and 12ft, but the winds are mostly cross-on or onshore, ripping the faces apart. It's marginal at best. There's a brief moment on Monday the 21st morning where an 12ft SW swell with a 15-second period and a cross-offshore wind makes things look clean. The energy is very strong at 5051, but that's a heavy wave for experts only.
Then the real standout, the one you've been waiting for, comes at the very end. On Wednesday the 30th of September morning, The Window delivers. We’ve got a 10ft SW groundswell with a very long 16-second period. The wind? Glassy. Dead calm. The comment says it all: "excellent surf conditions for experienced surfers". The energy is a hefty 4056. That's the session to circle on your calendar. The long-period groundswell will be pouring into that reef, making for some proper, powerful, lined-up waves. It's a top-tier call.
The pattern is clear: a brief window of clean fun early, then a long, messy, blown-out middle period, finishing with a potential classic. Don't waste your energy on the stuff in between.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Fri afternoon. Warm (max 23°C on Wed afternoon, min 15°C on Wed morning). Winds increasing (light winds from the N on Wed afternoon, near gales from the NNW by Fri night). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sat morning. Very mild (max 17°C on Sat night, min 11°C on Sun night). Winds decreasing (strong winds from the W on Sat morning, light winds from the SSW by Mon night). | ||||||||||||||||||||
Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 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 14 | WSW 14 | WSW 13 | WSW 12 | WSW 17 | NW 9 | W 11 | WSW 14 | WSW 14 | WSW 13 | WSW 12 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | WSW 14 | SW 14 | SW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1299 | 721 | 1010 | 902 | 615 | 715 | 921 | 2921 | 6118 | 7442 | 5281 | 2641 | 1813 | 3531 | 5768 | 5051 | 4471 | 3004 | 2313 | 2519 | 2386 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross | cross-on | cross | cross | cross | on | on | on | cross-on | cross | cross-on | off | cross-off | cross-on | cross-on | on | cross-on | cross-off |
High Tide | 11:15PM0.65m | 11:43PM0.64m | 00:21AM0.61m | 1:35AM0.58m | 5:54AM0.60m | 6:48AM0.62m | |||||||||||||||
Low Tide | 1:39PM0.18m | 2:00PM0.14m | 2:23PM0.12m | 2:46PM0.11m | 2:32AM0.58m | 3:06PM0.10m | 3:22PM0.11m | 3:34PM0.12m | |||||||||||||
 | |  | | | | |  |  |  |  | | | | | | |  | | | | |
 | 6:18 | — | — | 6:16 | — | — | 6:16 | — | — | 6:15 | — | — | 6:13 | — | — | 6:11 | — | — | 6:09 | — | — |
 | — | 6:10 | — | — | 6:12 | — | — | 6:13 | — | — | 6:13 | — | — | 6:14 | — | — | 6:15 | — | — | 6:15 | — |
mm | — | — | — | — | — | — | — | 1 | 3 | 1 | — | 1 | — | — | — | — | — | — | — | 1 | — |
Temp °C | 20 | 23 | 22 | 20 | 19 | 17 | 19 | 17 | 15 | 15 | 16 | 17 | 16 | 16 | 14 | 16 | 17 | 16 | 17 | 16 | 15 |
Feels °C | 17 | 21 | 21 | 18 | 17 | 15 | 13 | 8 | 4 | 6 | 10 | 12 | 13 | 12 | 10 | 12 | 15 | 14 | 14 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 13 | WSW 14 | WSW 14 | WSW 13 | WSW 12 | WSW 12 | WSW 17 | — | WSW 14 | WSW 14 | WSW 13 | WSW 12 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | WSW 14 | SW 14 | SW 13 |
| kJ | 1299 | 721 | 1010 | 902 | 615 | 715 | 805 | 1534 | — | 7442 | 5281 | 2641 | 1813 | 3531 | 5768 | 5051 | 4471 | 3004 | 2313 | 2519 | 2386 |
Swell 2 Height (m) Direction Period (s) | — | SW 16 | S 11 | S 11 | WSW 18 | WSW 19 | WSW 17 | W 11 | — | — | — | — | SSW 16 | — | — | — | — | — | — | — | WSW 14 |
| kJ | — | 358 | 112 | 61 | 211 | 243 | 921 | 91 | — | — | — | — | 26 | — | — | — | — | — | — | — | 969 |
Swell 3 Height (m) Direction Period (s) | — | NNE 4 | WSW 21 | WSW 20 | S 11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 1 | 42 | 39 | 20 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NE 4 | — | — | — | NNW 4 | NNW 5 | NNW 6 | NW 9 | W 11 | — | — | — | — | — | — | — | — | — | W 6 | — | — |
| kJ | 14 | — | — | — | 24 | 67 | 238 | 2921 | 6118 | — | — | — | — | — | — | — | — | — | 72 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 11 | 0 | 11 | 69 | 69 | 69 | 171 | 213 | 631 | 1322 | 1903 | 15 | 3 | 19 | 0 | 177 | 15 | 3 | 363 | 15 | 0 |
Best forecast wave conditions in Margaret River | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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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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