Backdoor 4 Surf Break

Lat Long: 33.28° S 151.57° E

Backdoor 4 Surf Forecast and Surf Report

Issued: 9 am 01 Sep 2026 (local time)

Forecast update in  hr  min

Today's Backdoor 4 sea temperature is
18.1°C
0.1° 

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 1 Sep 2026:

  • Best quality surf: Sunday 6 Sep, 10AM (local time) - 4.5ft (1.4m), 12s period, S swell with cross-offshore winds.
  • Most powerful swell: Sunday 6 Sep, 10AM (local time) - 4.5ft (1.4m), 12s period, S swell with 547 kJ wave energy.
  • Next surfable swell (1★+): Friday 4 Sep, 10AM (local time) - 3.5ft (1.1m), 11s 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 Friday (Sep 04) at 10AM. The primary swell is predicted to be 1.1m and 11s period. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Backdoor 4 in the next 16 days are 1.4m 12s and forecast to arrive on Sunday (Sep 06) at 10AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 6s period and expected on Friday (Sep 04) at 4AM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+)10AM (Fri 4th Sep)3.5ft (1.1m) 11s
Best Surf10AM (Sun 6th Sep)4.5ft (1.4m) 12s
Most Powerful10AM (Sun 6th Sep)4.5ft (1.4m) 12s

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


The Lowdown

Alright folks, Rusty here, lookin' at what's on the cards for us right through to mid-September.

Straight off the bat, it's a painful start. For the first few days, the ocean is just flat and nothin'. We're talkin' Tuesday through to Thursday with barely a ripple, let alone a wave. The energy is weak (72 to 154 on the meter) and the conditions are poor. It's a rough, empty spell. But hold on, because the weekend is where the story changes.

Friday the 4th is the first glimmer. The energy jumps to a moderate 291 combined energy units. The wind goes glassy in the morning, and we get a clean 4ft swell from the south with an 11-second period. It’s not huge, but after the drought, that’s a solid start.

Now, the standout of the whole run is Sunday, the 6th of September. This is the one to circle. Backdoor 4 (that reef break we all know) will be firing first thing. We’re lookin' at a clean 5ft S swell, with a nice 12-second period and a light offshore wind from the southeast cleaning it right up. The wave energy is strong at 575 combined units – that's proper power. For intermediate surfers, that’s about as good as it gets for the whole outlook. The water temp is about 65°F, pretty bang on average for this time of year, so just a spring suit.

Later on Saturday the 12th and into Sunday the 13th, we get another pulse. Saturday morning brings a clean 6ft swell from the SSE with a light offshore wind. The energy is moderate at 597, but the 9-second period is a little short, so it’s not as well-shaped as the earlier swell. Then Sunday the 13th morning is even better: a 4ft SE swell, clean conditions, and a better 10-second period.

Through the second week, the big news is the swell on the 10th and 11th. That south swell pumps up to 16ft on Friday the 11th with an incredible 13-second period, and the energy readings go crazy – over 16,000! But here’s the thing – it’s simply too big for the break. 12ft plus is strictly for experts only, and even that might be pushing it. The wind is offshore and clean, but it’s a beast. The 9th of September also sees strong, howling offshore winds at 25 mph, making it hard to even get out there.

For the last days, the 14th to the 16th, the swell fades back down to 3ft or less. The energy drops off (as low as 77 combined units), and while there are a few glassy mornings, the waves are small and won't hold your attention.

The absolute best on offer: That Sunday, the 6th of September. Clean, punchy, and just the right size for a good session.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 27°C on Thu morning, min 13°C on Thu night). Mainly fresh winds.

Days 4-6 Weather Summary

Mostly dry. Warm (max 29°C on Sat morning, min 13°C on Sun night). Winds increasing (calm on Fri morning, fresh winds from the WNW by Sat afternoon).

Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
Sunday
6
Monday
7
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
0
0
0
0
0
0
0
0
2
0
0
0
0
0
3
0
1
0
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1
S
11
0.9
S
11
0.8
S
10
0.7
S
10
0.7
S
11
0.6
S
10
0.6
S
10
0.5
S
10
0.4
SSE
10
1.1
S
11
0.8
S
9
0.3
S
16
0.6
S
10
0.6
S
10
0.4
S
9
1.4
S
12
1.3
S
9
0.6
S
13
1.1
S
10
0.9
S
10
1.3
ENE
7
Wave Graph
Metric surfscale
Energy kJ
250
189
138
104
110
71
73
53
33
272
96
44
71
68
27
547
295
117
242
153
154
Wind (km/h)
15
N
20
NNW
15
NW
20
NW
15
NW
15
NW
30
NW
5
S
15
WSW
0
N
25
ENE
15
NW
20
NNW
20
WNW
15
SW
10
SE
15
E
10
N
15
NE
25
NE
10
N
Wind State
on
on
cross-on
cross-on
cross-on
cross-on
cross-on
glassy
cross-off
glassy
cross-on
cross-on
on
cross-on
cross-off
cross-off
cross
on
cross-on
cross-on
on
High Tide
10:41AM1.45m
10:52PM1.27m
11:26AM1.45m
11:44PM1.14m
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
Low Tide
4:55PM0.29m
4:57AM0.24m
5:52PM0.33m
5:42AM0.32m
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
clear
clear
part cloud
part cloud
clear
part cloud
clear
clear
clear
clear
clear
part cloud
clear
part cloud
clear
clear
clear
clear
clear
cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:11
6:11
6:09
6:07
6:07
6:05
6:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:35
5:36
5:36
5:37
5:37
5:37
5:38
 mm
Temp °C
24
25
20
26
26
22
27
23
17
17
19
18
29
27
22
17
17
17
18
19
18
Feels °C
19
20
17
22
22
18
22
22
12
13
16
15
24
23
20
14
14
14
15
16
17
  • Map Icons:
  • Break
  • 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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