Surf Forecasts:
Back Beach surf forecast from 21 Aug 2026:
- Best quality surf: Friday 21 Aug, 5PM (local time) - 10ft (3.0m), 15s period, WSW swell with cross-onshore winds.
- Most powerful swell: Wednesday 26 Aug, 11PM (local time) - 15ft (4.5m), 17s period, WSW swell with 12,188 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 5PM (local time) - 10ft (3.0m), 15s period with WSW swell.
Best Forecast Surf Conditions for Back Beach this week:
The surf forecast for Back Beach over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 21) at 5PM. The primary swell is predicted to be 3.0m and 15s period with a secondary swell of 0.2m and 24s. The wind is predicted to be cross-onshore as the swell arrives.
The most powerful waves expected at Back Beach in the next 16 days are 4.5m 17s and forecast to arrive on Wednesday (Aug 26) at 11PM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Fri 21st Aug) | 10ft (3.0m) 15s |
| Best Surf | 5PM (Fri 21st Aug) | 10ft (3.0m) 15s |
| Most Powerful | 11PM (Wed 26th Aug) | 15ft (4.5m) 17s |
Table - best surf conditions forecast for Back Beach over the next 16 days.
The Lowdown
G'day, I'm Rusty, and I've got the full rundown on what's coming our way at Back Beach. This spot is exposed to the southwest swell, but she's a tricky one to call because the majority of the run is going to be way too big for most of us. The water temp is sitting at about 66°, which is pretty normal for this time of year, so no surprises there.
The whole forecast period is a tale of two extremes: either the swell is pumping and the conditions are too gnarly, or it's dropping off but the wind is working against us. There's a big gap from now until the morning of Saturday the 24th of August where it's either too big, or the wind is just messy. The standouts are few and far between, but there are a couple of windows for the experienced crew.
The best of the lot, and the one to really circle on the calendar, is the morning of Monday the 24th of August. We've got a solid 8 ft swell from the WSW but the magic is in the wind—it's dead glassy. The combined energy is pumping at 2736, but the period is 14 seconds, so it's a proper groundswell. This is going to be a clean, powerful wave, but at that size, it's really only for the experienced surfers. It won't be a total zoo, but crowds can be possible here, so be early.
Another morning that's worth a look is Tuesday the 25th of August. The swell drops to 5 ft from the WSW, and we've got a clean, cross-offshore breeze from the NW. The energy is moderate at 1505, and the 13-second period will still give you some good shape. It's a much more manageable size, and it'll be clean.
After that, the surf gets wild again. The morning of Wednesday the 26th of August is a massive 13 ft from the WSW with a 19-second period and a cross-shore wind. The energy is insane at 10264, but that's a dangerous, heavy setup for experts only, and the wind is not helping. Then Thursday the 27th of August is still 12 ft from the same direction, just too big for the average surfer.
For a bit of a breather, the morning of Saturday the 29th of August is okay. We've got a 5 ft swell from the WSW with a solid offshore breeze from the ENE. The energy is moderate at 837, and the 12-second period is a bit shorter, but it'll be clean. It's a good option for the bigger crew, but the waves might be a bit weak.
The morning of Monday the 31st of August is another one for the experienced crew. 8 ft from the WSW, 16-second period, and a clean cross-offshore breeze from the NNW. The energy is strong at 3184, and it's glassy clean. It'll be a proper session for those who are comfortable in that size.
Later in the run, the morning of Saturday the 5th of September is a solid bet. The swell is 8 ft but from the SW, and we've got a clean cross-offshore breeze from the ESE. The energy is moderate at 2125, and the 14-second period is good. The direction is a bit more favorable, and it's clean. Again, it's a bit of size, so it's for the experienced crew.
Overall, there's no surf for beginners in this window. The consistent swell is too big for most of the run, and when it drops, the wind is often onshore. The best bet is to wait for those glassy or clean offshore windows, especially the morning of the 24th of August. It's a long-range call, but it's looking like a classic winter swell. Stay safe out there.
Rusty
Short Range ForecastLight rain (total 2mm), mostly falling on Sat afternoon. Warm (max 21°C on Fri afternoon, min 13°C on Fri morning). Winds decreasing (fresh winds from the S on Sat night, light winds from the SE by Sun night). | Days 4-6 Weather SummaryHeavy rain (total 20mm), heaviest during Wed afternoon. Very mild (max 17°C on Tue morning, min 13°C on Mon morning). Winds increasing (calm on Mon morning, fresh winds from the SW by Wed night). | ||||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | |||||||||||||||
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 15 | WSW 15 | WSW 15 | WSW 17 | WSW 16 | WSW 15 | WSW 14 | WSW 13 | WSW 16 | WSW 14 | WSW 14 | WSW 13 | WSW 13 | WSW 15 | WSW 14 | WSW 19 | WSW 18 | WSW 17 | WSW 16 | WSW 15 | WSW 14 |
Wave Graph | |||||||||||||||||||||
3574 | 3227 | 2842 | 4478 | 2629 | 1447 | 1028 | 1444 | 3417 | 2736 | 1889 | 1309 | 822 | 1797 | 2099 | 10264 | 11338 | 10775 | 6584 | 4517 | 3052 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-off | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | glassy | on | cross-off | cross-off | cross | cross | cross | on | on | cross | cross-on | cross-off |
High Tide | 4:40AM0.56m | 5:51AM0.58m | 6:45AM0.60m | 7:29AM0.61m | 8:07AM0.62m | 8:41AM0.61m | 11:12PM0.32m | ||||||||||||||
Low Tide | 3:26PM0.10m | 3:41PM0.08m | 3:58PM0.07m | 4:13PM0.07m | 4:26PM0.07m | 4:35PM0.09m | 4:39PM0.11m | 2:02AM0.29m | |||||||||||||
6:48 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:43 | — | — | 6:43 | — | — | 6:41 | — | — | |
— | 5:55 | — | — | 5:55 | — | — | 5:57 | — | — | 5:58 | — | — | 5:58 | — | — | 5:59 | — | — | 5:59 | — | |
mm | — | — | — | — | 1 | — | 1 | — | — | — | — | — | — | — | — | 2 | 15 | 3 | — | — | — |
Temp °C | 17 | 21 | 19 | 18 | 18 | 16 | 17 | 17 | 16 | 15 | 16 | 16 | 17 | 17 | 16 | 17 | 17 | 17 | 15 | 16 | 16 |
Feels °C | 13 | 18 | 15 | 17 | 15 | 10 | 12 | 13 | 13 | 14 | 13 | 14 | 15 | 14 | 13 | 13 | 12 | 10 | 11 | 11 | 12 |
Swell 1 Height (m) Direction Period (s) | WSW 15 | WSW 15 | WSW 15 | WSW 17 | WSW 16 | WSW 15 | WSW 14 | WSW 13 | WSW 16 | WSW 14 | WSW 14 | WSW 13 | WSW 13 | WSW 15 | WSW 14 | WSW 19 | WSW 18 | — | WSW 16 | WSW 15 | WSW 14 |
3574 | 3227 | 2842 | 4478 | 2629 | 1447 | 1028 | 1444 | 3417 | 2736 | 1889 | 1309 | 822 | 1797 | 2099 | 10264 | 11338 | — | 6584 | 4517 | 3052 | |
Swell 2 Height (m) Direction Period (s) | — | WSW 24 | WSW 19 | — | — | — | WSW 18 | WSW 18 | — | — | — | WSW 20 | WSW 16 | — | WSW 22 | — | — | — | — | — | — |
— | 55 | 1159 | — | — | — | 184 | 329 | — | — | — | 37 | 683 | — | 163 | — | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | SSW 4 | SSW 7 | SSW 6 | — | — | — | — | — | — | — | — | — | — | WSW 17 | — | — | — |
— | — | — | — | 10 | 405 | 136 | — | — | — | — | — | — | — | — | — | — | 10775 | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 3 | 108 | 0 | 71 | 515 | 265 | 184 | 290 | 3 | 0 | 251 | 0 | 0 | 480 | 474 | 265 | 121 | 125 | 71 | 265 | 3 |
Best forecast wave conditions in Perth City Coast | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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Information about the Back Beach Surf forecast
The above surf forecast table for Back Beach provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Back Beach can be found by selecting the local surf guide option on the grey menu. Our Back Beach 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 (Back Beach) 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 Back Beach 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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