Backdoor 4 Surf Break

Lat Long: 33.28° S 151.57° E

Backdoor 4 Surf Forecast and Surf Report

Issued: 9 am 19 Sep 2026 (local time)

Forecast update in  hr  min

Today's Backdoor 4 sea temperature is
18.5°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 19 Sep 2026:

  • Best quality surf: Monday 21 Sep, 10PM (local time) - 7ft (2.1m), 8s period, SSE swell with offshore winds.
  • Most powerful swell: Tuesday 22 Sep, 1AM (local time) - 8ft (2.5m), 10s period, S swell with 1,384 kJ wave energy.
  • Next surfable swell (1★+): Sunday 20 Sep, 7PM (local time) - 2ft (0.6m), 18s 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 Sunday (Sep 20) at 7PM. The primary swell is predicted to be 0.6m and 18s period with a secondary swell of 0.7m and 4s. Another secondary swell of 0.9m and 4s is also forecast. 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 10s and forecast to arrive on Tuesday (Sep 22) at 1AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 5s period and expected on Monday (Sep 21) at 4PM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+) 7PM (Sun 20th Sep)2ft (0.6m) 18s
Best Surf10PM (Mon 21st Sep)7ft (2.1m) 8s
Most Powerful 1AM (Tue 22nd Sep)8ft (2.5m) 10s

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


Short Range Forecast

Light rain (total 3mm), mostly falling on Mon night. Warm (max 29°C on Mon morning, min 14°C on Mon night). Winds increasing (light winds from the NW on Sat afternoon, fresh winds from the S by Mon morning).

Days 4-6 Weather Summary

Heavy rain (total 30mm), heaviest during Tue night. Very mild (max 18°C on Thu morning, min 14°C on Tue morning). Winds increasing (calm on Tue afternoon, fresh winds from the NE by Wed morning).

Saturday
19
Sunday
20
Monday
21
Tuesday
22
Wednesday
23
Thursday
24
Friday
25
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
0
0
0
0
0
0
0
!
2
3
0
0
0
0
0
0
0
0
0
!
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.5
S
17
0.7
S
9
0.5
S
9
0.8
S
10
0.5
S
18
0.5
S
17
0.7
S
11
0.1
NE
5
2.5
S
10
1.7
S
8
1.7
SSE
10
0.6
S
18
0.6
S
16
0.8
S
11
1.4
ENE
6
0.7
S
10
1.7
ENE
6
1.4
ENE
6
1.2
NE
6
1.7
ENE
6
2.1
NE
7
Wave Graph
Metric surfscale
Energy kJ
140
81
42
138
167
153
110
1
1384
422
619
225
172
152
150
98
199
127
102
197
452
Wind (km/h)
15
W
10
ENE
10
WSW
10
NNE
20
NE
15
NW
15
NW
30
S
25
SSE
20
SSE
15
S
35
ENE
35
ENE
35
NE
25
NE
20
NE
35
NE
20
NNE
15
NE
35
NE
15
NNE
Wind State
cross
cross-on
cross-off
cross-on
cross-on
cross-on
cross-on
off
off
cross-off
off
cross
cross-on
cross-on
cross-on
cross-on
cross-on
on
cross-on
cross-on
on
High Tide
2:04PM1.24m
3:16AM0.87m
3:16PM1.25m
4:27AM0.92m
4:18PM1.29m
5:17AM1.00m
5:08PM1.36m
5:57AM1.10m
5:51PM1.42m
6:33AM1.20m
6:30PM1.46m
7:06AM1.31m
7:08PM1.49m
Low Tide
9:21PM0.50m
8:23AM0.62m
10:27PM0.45m
9:41AM0.59m
11:15PM0.38m
10:43AM0.53m
11:53PM0.30m
11:33AM0.45m
00:26AM0.22m
12:17PM0.37m
00:58AM0.16m
12:59PM0.29m
1:29AM0.12m
clear
clear
clear
clear
clear
clear
clear
cloud
light rain
light rain
light rain
heavy rain
mod rain
light rain
rain showers
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:48
5:47
5:46
5:43
5:43
5:41
5:39
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:46
5:47
5:47
5:49
5:50
5:50
5:51
 mm
3
1
2
16
6
3
2
Temp °C
26
27
24
28
28
26
29
16
15
15
15
16
16
16
16
18
17
17
20
20
19
Feels °C
21
22
20
23
24
21
24
11
11
11
15
11
11
10
11
15
12
14
15
14
16
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder
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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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