Backdoor 4 Surf Break

Lat Long: 33.28° S 151.57° E

Backdoor 4 48 hour detailed Surf Forecast

Issued: 9 am 18 Sep 2026 (local time)

Forecast update in  hr  min

Today's Backdoor 4 sea temperature is
18.4°C
0.2° 

Backdoor 4 surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


How big are the waves at Backdoor 4 today (18 Sep):

  • Morning surf: Morning surf (18 Sep, local time) - 4ft (1.2m), 8s period with S swell.
  • Afternoon surf: Afternoon surf (18 Sep, local time) - 4ft (1.2m), 9s period with S swell.
  • Evening surf: Evening surf (18 Sep, local time) - 3.5ft (1.1m), 9s period with S swell.

The current surf forecast for Backdoor 4 at 3PM is: 1.2m 9s primary swell from a South direction and 0.9m 8s secondary swell from a Southeast direction, 0.4m 3s secondary swell from a East-northeast direction (forecast issued at 09:00am September 18). The wind direction is predicted to be cross-shore.

Time (AEST) & DateWave HeightWave Period
Morning (18 Sep)4ft (1.2m)8s
Afternoon (18 Sep)4ft (1.2m)9s
Evening (18 Sep)3.5ft (1.1m)9s

Table - waves today at Backdoor 4. (Swell directed towards the surf break)


Short Range Forecast

Mostly dry. Warm (max 27°C on Sun morning, min 15°C on Fri morning). Wind will be generally light.

Friday
18
Saturday
19
Sunday
20
7 AM
10 AM
1 PM
4 PM
7 PM
10 PM
1 AM
4 AM
7 AM
10 AM
1 PM
4 PM
7 PM
10 PM
1 AM
4 AM
7 AM
10 AM
1 PM
4 PM
7 PM
10 PM
Rating
(10 max)
1
1
0
0
1
1
0
0
0
2
1
0
0
0
0
0
0
0
0
0
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.3
S
9
1.2
S
8
1.2
S
9
1.2
S
9
1.1
S
9
1.1
S
9
0.6
S
16
0.6
S
16
0.8
S
10
0.5
S
17
0.7
S
10
0.7
S
9
0.7
S
9
0.6
S
9
0.5
S
10
0.6
S
10
0.6
S
10
0.8
S
11
0.8
S
10
0.5
S
18
0.6
S
18
0.6
S
17
Wave Graph
Metric surfscale
Energy kJ
245
204
209
239
210
211
190
190
117
140
90
81
81
61
44
67
76
143
130
165
222
220
Wind (km/h)
5
WNW
5
NE
15
E
20
ENE
10
NNE
10
W
15
W
20
W
20
W
10
WSW
10
ESE
15
ENE
15
NW
10
W
10
WSW
10
W
10
W
10
NE
15
ENE
25
NE
10
W
10
WNW
Wind State
cross-on
cross-on
cross
cross-on
cross-on
cross
cross
cross
cross
cross-off
cross-off
cross
cross-on
cross
cross-off
cross
cross
cross-on
cross-on
cross-on
cross
cross
High Tide
12:54PM1.27m
1:48AM0.86m
2:04PM1.24m
3:16AM0.87m
3:16PM1.25m
Low Tide
6:02AM0.53m
8:02PM0.50m
7:03AM0.59m
9:21PM0.50m
8:23AM0.62m
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:50
5:48
5:47
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:45
5:46
5:47
 mm
Temp °C
12
15
18
17
17
18
18
17
16
22
26
26
25
24
22
19
19
22
27
26
27
25
Feels °C
10
13
14
13
16
15
13
12
11
18
22
21
20
20
18
15
15
19
22
21
24
21
  • 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
How to use the Wavefinder 

FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Backdoor 4 surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.


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