Backdoor 4 Surf Break

Lat Long: 33.28° S 151.57° E

Backdoor 4 Surf Forecast and Surf Report

Issued: 3 am 03 Sep 2026 (local time)

Forecast update in  hr  min

Today's Backdoor 4 sea temperature is
18.6°C
0.3° 

Backdoor 4 surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Backdoor 4 surf forecast from 2 Sep 2026:

  • Best quality surf: Tuesday 8 Sep, 4AM (local time) - 8ft (2.5m), 8s period, SSE swell with offshore winds.
  • Most powerful swell: Tuesday 8 Sep, 7AM (local time) - 8ft (2.5m), 9s period, S swell with 1,119 kJ wave energy.
  • Next surfable swell (1★+): Thursday 3 Sep, 4PM (local time) - 1.5ft (0.5m), 10s 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 Thursday (Sep 03) at 4PM. The primary swell is predicted to be 0.5m and 10s period with a secondary swell of 0.4m and 10s. 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 2.5m 9s and forecast to arrive on Tuesday (Sep 08) at 7AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 6s period and expected on Friday (Sep 04) at 7AM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+) 4PM (Thu 3rd Sep)1.5ft (0.5m) 10s
Best Surf 4AM (Tue 8th Sep)8ft (2.5m) 8s
Most Powerful 7AM (Tue 8th Sep)8ft (2.5m) 9s

Table - best surf conditions forecast for Backdoor 4 over the next 16 days.


The Lowdown

Alright, Rusty here. Let’s see what’s on the menu for the next couple of weeks at Backdoor 4. This is a reef break, exposed to the swell, and it’s a very consistent spot, so we’ve got a fair bit to talk about.

Right off the bat, the water temp is sitting at 66°, which is just about normal for the time of year, so no surprises there.

The next few days are a bit of a mixed bag. Thursday, September 3rd, is a write-off with a messy cross-onshore wind and a weak 2ft south swell packing only 120 units of energy. You’d be better off cleaning the wax off your board. Friday morning, September 4th, is where it starts to get interesting. The wind goes glassy, and we’ve got a clean 3ft south swell with a decent 11-second period and 288 units of energy. That’s a solid little window for some fun, clean waves. Friday afternoon gets a bit choppy again with a cross-shore wind, so make the most of the morning.

Saturday is a no-go with strong onshore winds, and Sunday morning is tiny. But hold onto your leash – Sunday afternoon, September 6th, sees a jump in size with a 6ft south swell, 12-second period, and a meaty 831 units of energy. The wind is cross-offshore and clean. That’s a sneaky good session.

Monday, September 7th, is just okay – a bit of a cross-onshore wind and 4ft swell. The real standout lands on Tuesday, September 8th. The morning gets an 8ft south swell with an insane 1100 units of energy and a clean offshore wind. That’s big, powerful, and clean. But listen – at 8ft, this is strictly for the experts. It’s too big for beginners. The afternoon drops to 6ft with lighter winds, still excellent for experienced surfers. Wednesday, September 9th, stays good in the morning with a clean offshore wind and 4ft swell.

Now, we’ve got a gap. Thursday, September 10th, flares up again with a massive 8ft to 8ft south-southeast swell. The morning has 1284 units of energy, and the afternoon absolutely cranks with 3498 units thanks to a very long 16-second period. The wind is offshore and clean. This is another only-for-experts situation. That long period groundswell will be better on a reef like this, but it might make the paddle out a bit easier between sets.

The true highlight of the whole forecast, though, is Friday, September 11th. The morning has 6ft of south-southeast swell with 1240 units of energy, a clean cross-offshore breeze, and an 11-second period. The afternoon is even better: 6ft, 14-second period, 1492 units of energy, and that same clean cross-offshore wind. This is the best on offer. Excellent conditions for experienced surfers. Crowds are possible, so get there early.

After that, things drop off. Saturday, September 12th, has a cross-on wind and a messy 5ft swell. From Sunday, September 13th, all the way through to Friday, September 18th, it’s a long run of poor surf. Tiny swells, bad winds, and very low energy. There’s a tiny flicker on Friday afternoon, September 18th, with a glassy 2ft south swell from a very long 18-second period, but it’s not enough to get excited about on its own.

So, the call is clear: Tuesday morning, September 8th, for the big stuff, but the real gem is the whole of Friday, September 11th. That’s your session.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 29°C on Sat morning, min 14°C on Thu night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 3mm), mostly falling on Mon night. Very mild (max 18°C on Sun morning, min 12°C on Tue night). Winds increasing (calm on Sun night, fresh winds from the S by Mon night).

Thursday
3
Friday
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
Wednesday
9
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
1
0
2
0
0
0
0
0
0
2
2
1
0
1
!
3
1
2
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.6
S
10
0.5
S
10
0.4
SSE
10
1
S
11
1.1
S
9
0.5
S
12
0.7
S
10
0.6
S
9
0.6
ENE
6
0.4
NE
6
1.7
S
12
1.4
S
10
1.3
S
9
1.1
S
8
1.7
S
6
2.5
S
9
1.9
S
9
1.5
SSE
8
1.1
S
8
0.9
S
8
1.7
SSE
7
Wave Graph
Metric surfscale
Energy kJ
73
52
33
246
201
65
94
60
28
10
819
347
282
169
239
1088
542
240
163
107
310
Wind (km/h)
25
NW
10
WSW
15
WSW
5
SSW
20
ENE
10
WNW
25
N
25
NNW
25
WSW
15
SW
25
SSE
10
WSW
10
NNE
25
ENE
30
S
20
S
10
SE
10
WNW
20
S
35
S
35
S
Wind State
cross-on
cross-off
cross-off
glassy
cross
cross-on
on
on
cross-off
cross-off
cross-off
cross-off
cross-on
cross-on
off
off
cross-off
cross-on
off
off
off
High Tide
12:20PM1.44m
00:50AM1.03m
1:25PM1.43m
2:14AM0.96m
2:40PM1.44m
3:44AM0.96m
3:54PM1.49m
4:59AM1.02m
5:00PM1.56m
5:57AM1.12m
5:57PM1.63m
6:45AM1.22m
6:46PM1.66m
Low Tide
7:00PM0.37m
6:36AM0.40m
8:22PM0.37m
7:47AM0.46m
9:46PM0.33m
9:08AM0.47m
10:58PM0.24m
10:24AM0.43m
11:54PM0.15m
11:29AM0.35m
00:41AM0.08m
12:24PM0.27m
1:23AM0.04m
clear
clear
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
part cloud
clear
clear
rain showers
part cloud
clear
clear
cloud
cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:09
6:07
6:07
6:05
6:03
6:03
6:01
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:36
5:37
5:37
5:37
5:38
5:39
5:39
 mm
3
Temp °C
27
26
17
17
17
18
29
28
22
18
17
16
18
18
16
16
16
15
15
15
15
Feels °C
22
23
12
13
13
16
24
23
17
14
12
16
14
14
11
11
14
13
12
8
8
  • Map Icons:
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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