Backdoor 4 Surf Break

Lat Long: 33.28° S 151.57° E

Backdoor 4 Surf Forecast and Surf Report

Issued: 9 am 20 Sep 2026 (local time)

Forecast update in  hr  min

Today's Backdoor 4 sea temperature is
17.9°C
0.7° 

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 20 Sep 2026:

  • Best quality surf: Monday 21 Sep, 10PM (local time) - 7.5ft (2.3m), 8s period, S swell with offshore winds.
  • Most powerful swell: Tuesday 22 Sep, 1AM (local time) - 8ft (2.5m), 10s period, S swell with 1,580 kJ wave energy.
  • Next surfable swell (1★+): Monday 21 Sep, 10PM (local time) - 7.5ft (2.3m), 8s 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 Monday (Sep 21) at 10PM. The primary swell is predicted to be 2.3m and 8s period with a secondary swell of 0.8m and 12s. The wind is predicted to be 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 1.7m 6s period and expected on Monday (Sep 21) at 4PM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+)10PM (Mon 21st Sep)7.5ft (2.3m) 8s
Best Surf10PM (Mon 21st Sep)7.5ft (2.3m) 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

Moderate rain (total 14mm), heaviest on Tue night. Warm (max 29°C on Sun morning, min 14°C on Mon night). Winds decreasing (fresh winds from the SSE on Mon morning, calm by Tue afternoon).

Days 4-6 Weather Summary

Light rain (total 3mm), mostly falling on Wed morning. Warm (max 23°C on Fri morning, min 15°C on Thu night). Winds decreasing (fresh winds from the NE on Thu afternoon, light winds from the N by Fri night).

Sunday
20
Monday
21
Tuesday
22
Wednesday
23
Thursday
24
Friday
25
Saturday
26
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
!
2
3
0
0
0
0
0
0
0
0
0
1
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)
0.8
S
11
0.5
S
18
0.5
S
17
0.7
S
11
0.1
E
11
2.5
S
10
1.6
SSE
9
1.7
SSE
10
1.1
S
10
0.6
S
16
1.3
ENE
6
0.7
S
12
1.3
ENE
6
2
ENE
6
1.4
ENE
6
1.2
NE
6
1.7
ENE
6
1.7
NE
7
1.3
NE
7
1.3
ENE
7
1.3
ENE
7
Wave Graph
Metric surfscale
Energy kJ
143
167
153
110
2
1580
404
659
243
181
118
129
108
283
145
109
216
263
159
142
160
Wind (km/h)
10
NNE
20
NE
15
NW
15
WNW
30
SSE
25
SSE
15
SSE
5
SSE
20
NE
25
NE
35
NE
20
NE
20
NE
35
NE
15
N
20
NE
30
NE
10
N
15
NE
25
NE
35
S
Wind State
on
cross-on
cross-on
cross-on
off
off
cross-off
glassy
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
on
cross-on
cross-on
on
cross-on
cross-on
off
High Tide
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
7:40AM1.41m
7:47PM1.48m
Low Tide
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
1:41PM0.22m
2:01AM0.10m
clear
clear
clear
clear
part cloud
cloud
light rain
light rain
heavy rain
rain showers
part cloud
clear
clear
clear
clear
clear
part cloud
clear
clear
part cloud
light rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:47
5:46
5:43
5:43
5:41
5:39
5:39
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:47
5:47
5:49
5:50
5:50
5:51
5:52
 mm
1
2
11
3
1
Temp °C
29
28
26
29
16
15
15
15
16
17
17
17
18
18
17
23
22
23
28
26
21
Feels °C
24
23
21
24
11
10
12
15
13
14
12
13
14
12
14
18
17
20
22
21
19
  • 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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