Surf Forecasts:
Backdoor 4 surf forecast from 5 Aug 2026:
- Best quality surf: Friday 7 Aug, 1PM (local time) - 2.5ft (0.8m), 9s period, SSE swell with cross-offshore winds.
- Most powerful swell: Monday 10 Aug, 4AM (local time) - 7.5ft (2.3m), 8s period, NE swell with 672 kJ wave energy.
- Next surfable swell (1★+): Friday 7 Aug, 1PM (local time) - 2.5ft (0.8m), 9s period with SSE 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 Friday (Aug 07) at 1PM. The primary swell is predicted to be 0.8m and 9s period with a secondary swell of 0.4m and 9s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Backdoor 4 in the next 16 days are 2.3m 8s and forecast to arrive on Monday (Aug 10) at 4AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 5s period and expected on Monday (Aug 10) at 7PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1PM (Fri 7th Aug) | 2.5ft (0.8m) 9s |
| Best Surf | 1PM (Fri 7th Aug) | 2.5ft (0.8m) 9s |
| Most Powerful | 4AM (Mon 10th Aug) | 7.5ft (2.3m) 8s |
Table - best surf conditions forecast for Backdoor 4 over the next 16 days.
The Lowdown
Alright, grab your board. Rusty here. Let’s have a look at what’s cooking.
First off, the water is sitting at 64.4°, which is pretty much average for this time of year — nothing weird going on there.
Right now, we’ve got a bit of a flat spell to start. The first few days at Backdoor 4 are a write-off with tiny, weak swell and messy wind. We’re looking at a gap of about 8 days before anything really starts to fire. From Wednesday the 13th of August, things start to get interesting.
The real standout is Saturday the 15th of August. We’ve got a solid 6.6ft south swell rolling in, clean offshore wind from the south, and the energy is pumping at 599 to 651. That’s strong wave energy. This is the best day on offer — clean, good size, and the wind is doing you a favour. It’s a reef break, so it’s going to hold that south swell well. Keep in mind, at 6.6ft, this is for the experienced crew.
The following Tuesday the 18th of August is another cracker. The swell drops a touch to 5.2ft from the SSE, but the period stretches to 10 seconds, giving it some real push. Clean offshore wind again, and energy around 581. That’s a long period groundswell, so points and reefs like this one will be absolutely lining up.
The 19th and 20th of August are still good, with clean conditions and waist to chest-high waves, but the energy drops back a bit. Good for a paddle, just not the standout.
For the first week, don’t bother. It’s small, weak, and the wind is all over the shop. The 13th of August morning has a 6.9ft south swell, but the forecast says it’s too big for this break — that’s expert territory only. The 15th and 18th are your golden windows.
This is Backdoor 4, a reef break, so it’s consistent and exposed. It can get crowded, so be ready to share.
That’s the story. Stay wet.
Short Range ForecastMostly dry. Very mild (max 16°C on Wed morning, min 9°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Sun night. Very mild (max 18°C on Sun morning, min 9°C on Mon night). Winds increasing (calm on Sat morning, strong winds from the NW by Sun night). | ||||||||||||||||||||
Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | |||||||||||||||
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) | E 10 | E 9 | E 8 | S 10 | S 8 | S 9 | S 9 | SSE 9 | SSE 9 | SSE 9 | E 8 | E 8 | ENE 9 | ENE 9 | ENE 8 | ENE 9 | ENE 9 | ENE 9 | S 10 | S 10 | S 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 31 | 26 | 22 | 30 | 112 | 97 | 110 | 113 | 66 | 32 | 35 | 63 | 180 | 131 | 351 | 389 | 172 | 55 | 484 | 432 | 230 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross-on | cross | cross-off | cross-off | glassy | cross-on | on | on | cross-on | cross-on | cross | cross | cross-on | cross | cross | cross |
High Tide | 12:52PM1.35m | 00:55AM1.12m | 1:51PM1.39m | 2:10AM1.03m | 2:58PM1.44m | 3:35AM0.98m | 4:07PM1.52m | 4:56AM1.00m | 5:11PM1.61m | 6:03AM1.06m | 6:09PM1.71m | 6:59AM1.13m | 7:02PM1.78m | ||||||||
Low Tide | 7:10PM0.45m | 7:05AM0.31m | 8:28PM0.44m | 8:05AM0.36m | 9:51PM0.38m | 9:15AM0.39m | 11:06PM0.28m | 10:26AM0.38m | 00:08AM0.16m | 11:31AM0.33m | 1:02AM0.07m | 12:29PM0.27m | 1:50AM-0.00m | ||||||||
 | |  |  |  |  | | | | | | | | |  | | | | | | | |
 | 6:41 | — | — | 6:41 | — | — | 6:39 | — | — | 6:39 | — | — | 6:37 | — | — | 6:37 | — | — | 6:35 | — | — |
 | — | 5:16 | — | — | 5:17 | — | — | 5:17 | — | — | 5:19 | — | — | 5:20 | — | — | 5:20 | — | — | 5:21 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | — | — | — | — | — | — |
Temp °C | 16 | 16 | 13 | 13 | 14 | 13 | 14 | 14 | 14 | 13 | 15 | 14 | 18 | 18 | 17 | 14 | 14 | 10 | 17 | 19 | 14 |
Feels °C | 13 | 12 | 7 | 10 | 11 | 9 | 11 | 10 | 12 | 11 | 12 | 10 | 13 | 13 | 12 | 4 | 4 | 3 | 13 | 15 | 8 |
Swell 1 Height (m) Direction Period (s) | SSW 5 | E 9 | E 8 | SSW 5 | S 8 | S 9 | S 9 | SSE 9 | SSE 9 | SSE 9 | E 8 | E 8 | ENE 9 | ENE 9 | SE 8 | ENE 9 | ENE 9 | SSW 8 | S 10 | S 10 | S 9 |
| kJ | 17 | 26 | 22 | 8 | 112 | 97 | 110 | 113 | 66 | 32 | 35 | 63 | 180 | 131 | 3 | 389 | 172 | 131 | 484 | 432 | 230 |
Swell 2 Height (m) Direction Period (s) | E 10 | SSW 5 | S 10 | S 10 | E 11 | SE 10 | ENE 9 | ENE 6 | ENE 7 | ENE 7 | SSE 9 | SSE 9 | SSE 8 | SSE 8 | E 14 | S 13 | N 5 | ENE 9 | ENE 10 | ENE 10 | ENE 10 |
| kJ | 31 | 8 | 18 | 30 | 20 | 25 | 28 | 8 | 41 | 18 | 31 | 15 | 7 | 6 | 4 | 3 | 2 | 55 | 35 | 58 | 56 |
Swell 3 Height (m) Direction Period (s) | S 10 | S 9 | SSE 12 | E 8 | SSE 12 | E 10 | SE 12 | E 8 | S 8 | SSW 8 | SSW 8 | ENE 10 | S 6 | E 14 | S 13 | — | S 13 | E 13 | S 18 | S 17 | NE 7 |
| kJ | 8 | 2 | 15 | 5 | 13 | 18 | 35 | 5 | 20 | 22 | 19 | 20 | 3 | 4 | 3 | — | 3 | 4 | 6 | 6 | 2 |
Wind waves Height (m) Direction Period (s) | — | — | SW 4 | — | — | NNE 2 | WNW 2 | — | — | — | — | NE 4 | NNW 3 | NE 3 | ENE 8 | WNW 5 | W 5 | WNW 4 | WNW 4 | NW 3 | WNW 4 |
| kJ | — | — | 20 | — | — | 1 | 1 | — | — | — | — | 14 | 4 | 5 | 351 | 56 | 70 | 24 | 7 | 1 | 8 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 2 | 57 | 2 | 3 | 91 | 2 | 0 | 0 | 0 | 2 | 72 | 37 | 2 | 32 | 99 | 223 | 208 | 11 | 2 | 0 | 0 |
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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