Surf Forecasts:
Backdoor 4 surf forecast from 6 Sep 2026:
- Best quality surf: Sunday 6 Sep, 10PM (local time) - 10ft (3.0m), 11s period, S swell with offshore winds.
- Most powerful swell: Friday 11 Sep, 1AM (local time) - 10ft (3.0m), 12s period, S swell with 2,495 kJ wave energy.
- Next surfable swell (1★+): Sunday 6 Sep, 1PM (local time) - 3.5ft (1.1m), 7s period with S swell.
Best Forecast Surf Conditions for Backdoor 4 this week:
The surf forecast for Backdoor 4 over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Sep 06) at 1PM. The primary swell is predicted to be 1.1m and 7s period with a secondary swell of 0.3m and 6s. Another secondary swell of 0.2m and 10s is also forecast. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Backdoor 4 in the next 16 days are 3.0m 12s and forecast to arrive on Friday (Sep 11) at 1AM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1PM (Sun 6th Sep) | 3.5ft (1.1m) 7s |
| Best Surf | 10PM (Sun 6th Sep) | 10ft (3.0m) 11s |
| Most Powerful | 1AM (Fri 11th Sep) | 10ft (3.0m) 12s |
Table - best surf conditions forecast for Backdoor 4 over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s break down what’s coming for Backdoor 4 over the next couple of weeks.
Right off the bat, the start of the period is a bit of a letdown. Sunday morning is tiny with a weak 1ft swell from the NE and a short period, plus a cross-off breeze. The combined energy is a measly 29 – barely a ripple. It picks up a little Sunday afternoon with a 4ft S swell and clean offshore wind, but it’s still pretty ordinary. The real action doesn’t start until Monday morning. That’s when we see a clean 5ft S swell with glassy conditions – you’ll want to be out there early. The combined energy jumps to 306 (moderate) and the water temp is sitting at 66°, which is about normal for this time of year.
Now, the standout session is Tuesday morning, 8th September. We’ve got a solid 10ft S swell, a 10-second period, and clean offshore wind. The combined energy is a massive 1469 – that’s strong, powerful stuff. This is proper groundswell, and at this size, it’s strictly for experts only. It’s going to be too big for beginners. The long period means it’ll hold up well here at this exposed reef break, with the swell coming from the S – right in the optimum direction. Offshore winds will keep it glassy. Just be aware, with ‘very consistent’ surf, it’ll be pumping, and the crowds can show up sometimes, so pick your peak.
Tuesday afternoon holds at 8ft and is still solid, but the wind goes cross-off. Wednesday morning drops to 5ft with clean offshore wind, a good option for the intermediates. The energy drops to 411. After that, the swell stays big on Thursday and Friday – 10ft and 7ft respectively – all with clean offshore winds, but again, heavy and expert-only territory. The combined energy on Thursday afternoon hits 1918 (very strong).
Into the second week, things get more promising but less certain. The 15th September (Tuesday) shows a 5ft SSE swell with a 7-second period – short period, so not as much punch, but it’s clean and the energy is 426 (moderate). The 17th September (Thursday) morning has a clean 4ft S swell with light offshore wind and a 9-second period, decent for a fun little session. After that, the swell fades out and the wind turns onshore, making for poor conditions through to the end of the forecast. The 20th September (Sunday) afternoon goes glassy with a tiny 2ft S swell, but it’s just too small to get excited about.
Overall, the best window is the 8th to the 11th of September for the big stuff, but only if you’ve got the skills. For the everyday surfer, Monday morning the 7th and Wednesday morning the 9th are your best bets for clean, manageable waves.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Mon night. Very mild (max 19°C on Sun morning, min 11°C on Tue night). Winds increasing (calm on Mon morning, fresh winds from the S by Mon night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 17°C on Fri morning, min 12°C on Thu night). Winds decreasing (strong winds from the SSW on Wed morning, calm by Fri morning). | ||||||||||||||||||||
Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | |||||||||||||||
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) | NE 7 | S 8 | S 10 | S 8 | SSE 9 | S 7 | S 10 | SSE 9 | SSE 10 | SSE 9 | S 8 | S 10 | S 10 | S 10 | S 12 | S 11 | S 10 | S 10 | S 10 | S 9 | S 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 11 | 164 | 1250 | 295 | 349 | 652 | 1462 | 938 | 696 | 397 | 647 | 2306 | 1559 | 1514 | 2495 | 974 | 808 | 857 | 1299 | 395 | 666 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | off | glassy | cross | off | off | cross-off | cross-on | off | off | off | off | off | cross | glassy | cross-off | cross-off | cross-off | cross | on |
High Tide | 3:54PM1.49m | 4:59AM1.02m | 5:00PM1.56m | 5:57AM1.12m | 5:57PM1.63m | 6:45AM1.22m | 6:46PM1.66m | 7:28AM1.31m | 7:31PM1.65m | 8:07AM1.40m | 8:14PM1.59m | 8:44AM1.46m | 8:54PM1.50m | ||||||||
Low Tide | 10:58PM0.24m | 10:24AM0.43m | 11:54PM0.15m | 11:29AM0.35m | 00:41AM0.08m | 12:24PM0.27m | 1:23AM0.04m | 1:14PM0.21m | 2:00AM0.03m | 2:01PM0.17m | 2:35AM0.06m | 2:47PM0.17m | 3:07AM0.11m | ||||||||
 | |  |  | |  | | |  | |  | | | | | | | | | | | |
 | 6:05 | — | — | 6:03 | — | — | 6:03 | — | — | 6:01 | — | — | 6:01 | — | — | 5:58 | — | — | 5:58 | — | — |
 | — | 5:37 | — | — | 5:38 | — | — | 5:39 | — | — | 5:39 | — | — | 5:40 | — | — | 5:42 | — | — | 5:42 | — |
mm | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 18 | 17 | 17 | 17 | 15 | 16 | 15 | 15 | 16 | 15 | 15 | 14 | 13 | 13 | 17 | 16 | 15 | 15 | 15 | 15 |
Feels °C | 15 | 13 | 13 | 13 | 13 | 10 | 12 | 12 | 13 | 12 | 7 | 7 | 8 | 9 | 11 | 13 | 11 | 12 | 14 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | NE 7 | NE 6 | S 10 | S 8 | SSE 9 | E 10 | E 10 | SSE 9 | SSE 10 | SSE 9 | E 9 | ESE 11 | ESE 10 | S 17 | S 12 | S 11 | S 10 | S 10 | S 10 | S 9 | S 12 |
| kJ | 11 | 6 | 1250 | 295 | 349 | 9 | 7 | 938 | 696 | 397 | 7 | 48 | 39 | 146 | 1794 | 974 | 808 | 857 | 938 | 395 | 666 |
Swell 2 Height (m) Direction Period (s) | E 11 | E 10 | E 10 | E 10 | E 10 | — | — | E 10 | E 10 | E 9 | E 13 | E 16 | S 23 | S 22 | ESE 9 | SE 8 | E 14 | E 13 | SSE 18 | S 11 | SSE 20 |
| kJ | 9 | 8 | 8 | 8 | 8 | — | — | 8 | 7 | 7 | 4 | 5 | 93 | 240 | 8 | 3 | 14 | 14 | 65 | 287 | 533 |
Swell 3 Height (m) Direction Period (s) | E 11 | S 15 | NE 8 | NE 8 | NE 8 | — | — | — | — | E 16 | E 17 | NE 16 | E 16 | ESE 10 | E 15 | S 21 | E 9 | E 9 | ENE 14 | S 18 | ENE 13 |
| kJ | 9 | 4 | 2 | 3 | 3 | — | — | — | — | 5 | 6 | 10 | 5 | 18 | 4 | 36 | 2 | 2 | 19 | 238 | 16 |
Wind waves Height (m) Direction Period (s) | SSW 6 | S 8 | — | — | — | S 7 | S 10 | — | — | NW 3 | S 8 | S 10 | S 10 | S 10 | S 12 | — | — | — | S 10 | — | — |
| kJ | 71 | 164 | — | — | — | 652 | 1462 | — | — | 2 | 647 | 2306 | 1559 | 1514 | 2495 | — | — | — | 1299 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 456 | 169 | 1 | 0 | 2 | 0 | 215 | 1 | 1 | 0 | 0 | 0 | 37 | 0 | 0 | 37 | 2 |
Best forecast wave conditions in Newcastle | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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Information about the Backdoor 4 Surf forecast
The above surf forecast table for Backdoor 4 provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Backdoor 4 can be found by selecting the local surf guide option on the grey menu. Our Backdoor 4 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 (Backdoor 4) 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 Backdoor 4 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.
Backdoor 4 is 14 km (9 miles) from the city of Catherine Hill Bay. If you plan a holiday in Newcastle, look for hotels and other accommodation in Catherine Hill Bay. Catherine Hill Bay has rooms for a wide range of budgets as well as car hire and transport links.
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