Backdoor 4 Surf Break

Lat Long: 33.28° S 151.57° E

Backdoor 4 Surf Forecast and Surf Report

Issued: 9 pm 10 Sep 2026 (local time)

Forecast update in  hr  min

Today's Backdoor 4 sea temperature is
18.3°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 10 Sep 2026:

  • Best quality surf: Wednesday 16 Sep, 1AM (local time) - 7ft (2.1m), 6s period, S swell with offshore winds.
  • Most powerful swell: Wednesday 16 Sep, 10AM (local time) - 8ft (2.5m), 9s period, S swell with 1,121 kJ wave energy.
  • Next surfable swell (1★+): Friday 11 Sep, 7AM (local time) - 6.5ft (2.0m), 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 Friday (Sep 11) at 7AM. The primary swell is predicted to be 2.0m and 10s period with a secondary swell of 0.1m 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 Wednesday (Sep 16) at 10AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Tuesday (Sep 15) at 10PM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+) 7AM (Fri 11th Sep)6.5ft (2.0m) 10s
Best Surf 1AM (Wed 16th Sep)7ft (2.1m) 6s
Most Powerful10AM (Wed 16th 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 talk about what’s shaping up at Backdoor 4.

First up, we’ve got a solid run of clean surf kicking off Friday the 11th. The swell is already pumping with a combined energy of 707 (moderate wave energy), chest to head high, coming from the south with a 10-second period. The wind is a light cross-offshore, keeping things tidy. This is good, rippable stuff. The water temp is about average for this time of year, so nothing wild there.

The standout of the whole outlook is Saturday morning, the 12th. The swell drops a touch to 4ft, but the period lengthens to 12 seconds, giving it more grunt and shape. The kicker is the wind – glassy, absolutely dead calm. That’s a major positive. It’s going to be silky smooth out there, with that long-period groundswell wrapping in nicely. This is your best window. Get out early.

Saturday afternoon gets a bit messy with a cross-shore wind, and the surf quality drops. Then Sunday the 13th and Monday the 14th are a write-off – small, weak, and the wind is onshore and lumpy. We’re looking at about two days of poor conditions.

Tuesday the 15th is flat, with combined energy down to 60 (weak). The next real action is Wednesday the 16th. A big pulse of swell arrives, reaching 8ft with a combined energy of 1157 (strong wave energy). That’s a lot of power. The wind is fresh offshore, so it’s clean, but this is only for experienced surfers. It’s too big for the average punter. The period is short at 9 seconds, so it’s a bit of a wall of water.

We go through a few more days of small, weak surf and poor winds until we get to Friday the 18th, where a very long period 19-second swell shows up. The problem is it’s only 2ft and the wind is cross-onshore, so it’s not going to be any good. That long period would be great for a point or reef, but not here with that wind.

Things pick up a little again on Sunday the 20th, with 5ft of south swell, but the wind is cross-onshore and choppy, making it a mess. The rest of the outlook from the 21st onward is a mix of small, weak, and ordinary conditions. There’s a brief shot on Wednesday the 23rd afternoon with a moderate offshore wind and 5ft swell, but it’s a short period NE windswell, so it’s just ordinary.

Overall, the call is simple: Saturday morning the 12th is the gem. Glassy, clean, nice groundswell. If you’re out there, you’ll know it. The rest of the window is either too big, too small, or blown out.

Rusty.

Short Range Forecast

Mostly dry. Very mild (max 18°C on Sun afternoon, min 13°C on Thu night). Winds increasing (calm on Fri night, fresh winds from the NE by Sun afternoon).

Days 5-7 Weather Summary

Light rain (total 2mm), mostly falling on Tue night. Warm (max 25°C on Mon afternoon, min 14°C on Tue night). Winds increasing (light winds from the N on Mon morning, fresh winds from the SSE by Tue night).

Friday
11
Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
!
3
3
2
3
1
1
0
0
1
0
0
0
0
0
!
!
!
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2.2
S
10
1.9
S
10
1.6
S
10
1.4
S
10
1.3
S
12
1.2
S
11
1
S
10
0.9
S
10
0.9
S
11
0.8
S
10
0.7
S
12
0.7
S
11
0.5
S
10
0.4
S
10
0.4
S
9
2.1
S
6
2.5
S
9
2.2
S
9
0.9
S
12
Wave Graph
Metric surfscale
Energy kJ
947
701
499
377
480
364
198
154
188
138
132
114
48
29
25
367
1121
792
212
Wind (km/h)
15
SW
10
SW
15
SSE
10
SW
5
SSE
15
ENE
10
N
10
NE
30
NE
10
NNW
10
N
25
NE
10
NW
15
SSE
15
SE
35
SSE
30
SSE
20
SSE
5
SSE
Wind State
cross-off
cross-off
cross-off
cross-off
glassy
cross
on
cross-on
cross-on
cross-on
on
cross-on
cross-on
cross-off
cross-off
off
off
off
glassy
High Tide
8:07AM1.40m
8:14PM1.59m
8:44AM1.46m
8:54PM1.50m
9:21AM1.49m
9:34PM1.38m
9:57AM1.49m
10:13PM1.25m
10:34AM1.46m
10:54PM1.12m
11:13AM1.40m
11:39PM1.01m
Low Tide
2:00AM0.03m
2:01PM0.17m
2:35AM0.06m
2:47PM0.17m
3:07AM0.11m
3:31PM0.19m
3:39AM0.19m
4:15PM0.24m
4:10AM0.28m
5:01PM0.31m
4:42AM0.37m
5:51PM0.39m
part cloud
part cloud
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
part cloud
part cloud
light rain
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:58
5:58
5:56
5:54
5:54
5:52
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:42
5:42
5:43
5:44
5:44
5:45
 mm
2
Temp °C
15
15
16
16
16
17
16
17
18
17
24
25
24
17
17
15
15
15
15
Feels °C
12
13
13
16
14
14
14
12
13
14
20
19
21
16
15
11
8
10
12
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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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