Backdoor 4 Surf Break

Lat Long: 33.28° S 151.57° E

Backdoor 4 Surf Forecast and Surf Report

Issued: 9 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 3 Sep 2026:

  • Best quality surf: Tuesday 8 Sep, 7AM (local time) - 8ft (2.5m), 8s period, S swell with cross-offshore winds.
  • Most powerful swell: Tuesday 8 Sep, 10AM (local time) - 8ft (2.5m), 9s period, S swell with 1,137 kJ wave energy.
  • Next surfable swell (1★+): Friday 4 Sep, 1AM (local time) - 2ft (0.6m), 9s period with ENE 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 1AM. The primary swell is predicted to be 0.6m and 9s 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 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 1.1m 6s period and expected on Friday (Sep 04) at 4AM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+) 1AM (Fri 4th Sep)2ft (0.6m) 9s
Best Surf 7AM (Tue 8th Sep)8ft (2.5m) 8s
Most Powerful10AM (Tue 8th Sep)8ft (2.5m) 9s

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


The Lowdown

Alright folks, Rusty here. Let’s take a look at the outlook for Backdoor 4. It’s a reef break, pretty consistent and it exposes itself to the south swell, which it likes from the east. Don't go thinking the name means it's a walk in the park though – it’s a spot for the experienced crew.

We’re in for a bit of a slow start. The first couple of days, Thursday the 3rd and Friday the 4th, are a write-off with poor conditions. There’s a bit of a wait, but patience pays off. The real action starts tuning up around Sunday the 6th. The afternoon shows a clean 6 ft south swell with a solid 12-second period – that's proper groundswell energy. The combined energy is pumping at 819 (moderate to strong), and with that clean, cross-off wind, this is looking like a very good session. That energy is there, the lines will have shape.

But the standout, the one to circle on the calendar, is Tuesday the 8th of September. Now we're talking. The morning brings a chunky 8 ft south swell and a combined energy reading of 1144 (strong). The wind is a clean cross-off, and the water temp is sitting right around average for this time of year at 66°F. The swell is predicted to be too big for this break, though – that’s a serious size warning. This is expert territory only. For the pros who know this reef, the afternoon session will be even better with a 7 ft wave and a moderate offshore wind. The crowds are said to be sometimes an issue here, and on a day with surf like this, you can bet your bottom dollar it’ll be busy.

After that peak, things taper a bit. Thursday the 10th offers a very clean morning with a 3 ft south swell, but with a very long 15-second period (846 combined energy) – that long period is fantastic for a reef like this. Into the second week, the size drops right off. Friday the 11th has good clean surf in the morning with 5 ft (639 energy) and glassy conditions, a nice follow-up.

Then we hit a dry spell. From Saturday the 12th onward, the conditions turn poor or marginal for paddle surfing. The swell gets small and the wind isn't kind. There’s a 10 ft spike on Friday the 18th, but it’s coming with a nasty 19 mph onshore wind – that's blown out and lumpy, a real mess. That’s one for the kite crew if anything.

So, best on offer is Tuesday the 8th for the experienced, with Sunday the 6th afternoon and Friday the 11th morning as your solid backups. Get on it early.

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

Mostly dry. Warm (max 20°C on Mon morning, min 12°C on Sun night). Winds increasing (calm on Sun night, fresh winds from the SSW by Mon afternoon).

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
0
1
2
0
0
0
0
0
0
2
1
1
1
0
!
!
2
2
1
2
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
0.6
ENE
9
1.3
S
11
1.1
S
9
0.5
S
12
0.8
S
10
0.6
S
9
0.5
S
10
0.4
NE
6
1.7
S
12
1.4
S
9
1.2
S
9
1.2
S
9
1.4
S
8
2.5
S
9
2.1
S
9
1.5
S
8
1.1
S
8
1
S
8
1.7
S
8
Wave Graph
Metric surfscale
Energy kJ
73
52
53
403
196
66
123
62
45
10
805
340
235
230
257
1137
707
279
171
132
393
Wind (km/h)
25
NW
15
W
15
WSW
0
SE
20
ENE
10
W
25
N
25
NW
20
WSW
10
SSW
20
SE
10
NW
5
NNW
15
SE
30
SSW
20
SSW
20
SSE
10
S
15
SSE
25
S
25
S
Wind State
cross-on
cross
cross-off
glassy
cross
cross
on
cross-on
cross-off
cross-off
cross-off
cross-on
on
cross-off
cross-off
cross-off
off
off
cross-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
clear
clear
clear
clear
part cloud
clear
clear
cloud
part 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
Temp °C
27
26
17
17
17
17
29
29
26
17
16
15
20
19
15
16
16
16
16
16
16
Feels °C
22
22
12
13
13
14
23
24
21
13
11
15
17
16
9
12
12
14
13
11
10
  • 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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