
Surf Forecasts:
Back Beach surf forecast from 12 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 5PM (local time) - 10ft (3.0m), 15s period, SW swell with cross-onshore winds.
- Most powerful swell: Tuesday 18 Aug, 2AM (local time) - 15ft (4.5m), 17s period, WSW swell with 10,257 kJ wave energy.
- Next surfable swell (1★+): Wednesday 12 Aug, 5PM (local time) - 10ft (3.0m), 15s period with SW 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 Wednesday (Aug 12) 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 Tuesday (Aug 18) at 2AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Sunday (Aug 16) at 8AM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Wed 12th Aug) | 10ft (3.0m) 15s |
| Best Surf | 5PM (Wed 12th Aug) | 10ft (3.0m) 15s |
| Most Powerful | 2AM (Tue 18th Aug) | 15ft (4.5m) 17s |
Table - best surf conditions forecast for Back Beach over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down what’s happening at Back Beach.
The water’s sitting at 66°, which is right about normal for this time of year, so you’re not dealing with any weird temperature surprises.
The first real standout is Friday afternoon, August 14th. The swell drops a touch to 8ft from the WSW, with a nice long 16-second period. That’s proper groundswell. The wind is light and cross-offshore, so the waves will be clean and lined up. The combined energy is a solid 3598 (moderate), and it’s the first time the conditions are marked as excellent for experienced surfers. This is your window if you’ve got the skills – it’s still too big for beginners.
Then Saturday morning, August 15th is another cracker. Swell is 8ft from the WSW, 14-second period, and we’ve got a clean, moderate offshore wind from the NE. That’s a recipe for some hollow, punchy waves. The combined energy is 2118 (moderate). This is the pick of the weekend for the more seasoned crew.
Sunday afternoon, August 16th is also a solid option. The swell bumps back up to 8ft from the WSW, with a 15-second period, and the wind is light offshore from the NE. It’ll be clean and powerful, with a combined energy of 3124 (moderate). Excellent for experienced surfers.
Now, from Monday the 17th into the middle of the week, it gets messy. The wind turns onshore and howls, with big, lumpy, blown-out conditions. Swell gets huge – over 12ft – but it’s a total write-off for paddling. If you’re a kite surfer, the setup from Monday afternoon through Thursday might look interesting, with strong cross-onshore winds and big, raw swell, but for a surfboard, it’s a no-go.
The next real chance comes Tuesday morning, August 18th. The swell is a massive 13ft from the WSW, with a 16-second period, and the wind is glassy. That’s a rare combination. The combined energy is a whopping 7926 (strong). This is strictly for experts only – it’s way too big for anyone else. The waves will be heavy and powerful, and with that very long period, it’ll be better on a point or reef, though Back Beach is an exposed beach, so expect some big, shifting peaks.
After that, it’s a mixed bag of onshore winds and huge, messy swell until we get a bit of a cleanup on Tuesday morning, August 25th. Swell drops to 6ft from the SW, 14-second period, with a light cross-offshore breeze. The combined energy is 1832 (moderate), and it’s marginal but clean. Not a standout, but a window for a quieter session.
Tuesday afternoon, August 25th is actually the best of the final week. Swell is 6ft from the WSW, 13-second period, with a clean cross-offshore wind. The combined energy is 1998 (moderate), and conditions are marked as excellent for experienced surfers. For a smaller, more manageable day, this is the one.
So the true standout is that Friday afternoon, August 14th and Saturday morning, August 15th for the experienced crew. The glassy, huge swell on Tuesday morning, August 18th is a real spectacle, but only for the brave. The second week is a bit of a letdown, with only the 25th offering a decent, smaller window.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Fri afternoon, min 11°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 5mm), mostly falling on Mon afternoon. Warm (max 24°C on Sun afternoon, min 15°C on Sat morning). Winds increasing (light winds from the NE on Sat afternoon, strong winds from the NW by Mon afternoon). | ||||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | |||||||||||||||
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 15 | SW 15 | SW 15 | SW 16 | SW 17 | SW 17 | SW 16 | WSW 16 | WSW 15 | WSW 14 | WSW 14 | WSW 13 | WSW 16 | WSW 15 | WSW 15 | WSW 19 | WSW 17 | WSW 17 | WSW 16 | WSW 16 | WSW 16 |
Wave Graph | |||||||||||||||||||||
3867 | 3231 | 3135 | 4405 | 5160 | 5190 | 4073 | 3598 | 2585 | 2118 | 1653 | 1283 | 2648 | 2738 | 2982 | 4409 | 7101 | 10257 | 7926 | 8589 | 6035 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-off | cross-off | cross-on | cross-off | off | cross-off | off | off | cross-on | cross-off | off | off | cross | cross | cross-on | on | glassy | cross-on | off |
High Tide | 8:53AM0.71m | 9:36AM0.66m | 00:32AM0.29m | 10:13AM0.58m | 00:05AM0.34m | 10:40AM0.49m | 00:07AM0.40m | 10:40AM0.40m | 00:20AM0.46m | 9:23AM0.33m | 00:41AM0.51m | 1:10AM0.54m | |||||||||
Low Tide | 5:43PM0.03m | 5:58PM0.10m | 2:11AM0.28m | 5:50PM0.18m | 3:48AM0.29m | 5:22PM0.22m | 5:02AM0.30m | 4:56PM0.23m | 6:17AM0.31m | 4:39PM0.21m | 4:20PM0.18m | ||||||||||
6:56 | — | — | 6:56 | — | — | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — | 6:52 | — | — | 6:50 | — | — | |
— | 5:50 | — | — | 5:51 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 3 | — | — | — | — |
Temp °C | 14 | 15 | 15 | 14 | 17 | 15 | 17 | 21 | 19 | 19 | 22 | 20 | 20 | 24 | 22 | 19 | 19 | 16 | 16 | 16 | 16 |
Feels °C | 13 | 13 | 12 | 11 | 15 | 11 | 13 | 18 | 15 | 14 | 20 | 17 | 13 | 22 | 19 | 13 | 10 | 8 | 14 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 15 | SW 15 | SW 16 | SW 17 | SW 17 | SW 16 | WSW 16 | WSW 15 | WSW 14 | WSW 14 | WSW 13 | WSW 16 | WSW 15 | WSW 15 | WSW 19 | — | WSW 17 | WSW 16 | WSW 16 | WSW 16 |
3867 | 3231 | 3135 | 4405 | 5160 | 5190 | 4073 | 3598 | 2585 | 2118 | 1653 | 1283 | 2648 | 2738 | 2982 | 4409 | — | 10257 | 7926 | 8589 | 6035 | |
Swell 2 Height (m) Direction Period (s) | — | WSW 24 | WSW 21 | — | — | — | — | — | — | — | — | — | — | WSW 20 | WSW 21 | — | — | — | — | — | — |
— | 54 | 180 | — | — | — | — | — | — | — | — | — | — | 127 | 260 | — | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 23 | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | 259 | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | NE 4 | — | — | WNW 4 | WSW 17 | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | 10 | — | — | 21 | 7101 | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 3 | 121 | 0 | 3 | 184 | 3 | 71 | 0 | 85 | 0 | 3 | 3 | 90 | 0 | 438 | 480 | 1680 | 817 | 3 | 122 | 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.
Are you planning a holiday in Perth City Coast? If you are looking for accommodation near Back Beach, camping, hotels and holiday cottages in Perth City Coast, consider staying in Perth which is 125 km (78 miles) away.











