Backdoor 4 Surf Break

Lat Long: 33.28° S 151.57° E

Backdoor 4 48 hour detailed Surf Forecast

Issued: 9 am 21 Aug 2026 (local time)

Forecast update in  hr  min

Today's Backdoor 4 sea temperature is
17.4° C
0.9° 

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 (21 Aug):

  • Morning surf: Morning surf (21 Aug, local time) - 2.5ft (0.8m), 6s period with ENE swell.
  • Afternoon surf: Afternoon surf (21 Aug, local time) - 2ft (0.6m), 6s period with ENE swell.
  • Evening surf: Evening surf (21 Aug, local time) - 2.5ft (0.7m), 4s period with NW swell.

The current surf forecast for Backdoor 4 at 4PM is: 0.6m 6s primary swell from a East-northeast direction and 0.1m 7s secondary swell from a Southeast direction, 0.5m 3s secondary swell from a North-northwest direction (forecast issued at 09:00am August 21). The wind direction is predicted to be cross-onshore.

Time (AEST) & DateWave HeightWave Period
Morning (21 Aug)2.5ft (0.8m)6s
Afternoon (21 Aug)2ft (0.6m)6s
Evening (21 Aug)2.5ft (0.7m)4s

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


Short Range Forecast

Some drizzle, heaviest during Sat night. Warm (max 20°C on Sat morning, min 14°C on Fri night). Winds decreasing (fresh winds from the NW on Fri afternoon, calm by Sat night).

Friday
21
Saturday
22
Sunday
23
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)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0
0
0
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)
0.9
ENE
6
0.8
ENE
6
0.7
ENE
6
0.6
ENE
6
0.7
NW
4
0.7
NW
4
0.4
NE
6
0.4
NE
6
0.4
NE
6
0.4
NE
6
0.4
NE
6
0.4
NE
6
0.4
NE
6
0.4
NE
6
0.4
NE
6
0.3
S
12
0.9
S
11
1.1
S
11
1.3
SSE
9
1.1
S
8
0.9
S
12
0.9
S
11
Wave Graph
Metric surfscale
Energy kJ
57
45
34
26
15
15
9
9
9
9
9
12
9
9
9
26
198
269
295
171
244
196
Wind (km/h)
10
NW
20
NNW
20
NNW
30
NW
25
NW
20
WNW
15
NW
10
WNW
15
WNW
10
WNW
10
ESE
15
ESE
10
SE
10
SSE
10
SSE
5
SE
10
E
10
ENE
5
NE
15
NE
15
NE
20
NE
Wind State
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross
cross-off
cross-off
cross-off
cross-off
cross-off
glassy
cross
cross-on
cross-on
cross-on
cross-on
cross-on
High Tide
2:54PM1.27m
3:41AM0.86m
4:01PM1.29m
4:54AM0.89m
4:58PM1.35m
Low Tide
7:49AM0.53m
10:05PM0.51m
8:59AM0.56m
11:10PM0.46m
10:09AM0.54m
cloud
cloud
part cloud
cloud
cloud
cloud
cloud
cloud
part cloud
clear
clear
clear
clear
clear
clear
part cloud
light rain
cloud
part cloud
cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:26
6:24
6:22
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:28
5:29
5:29
 mm
1
Temp °C
18
16
19
18
16
17
15
14
14
17
20
19
18
16
16
15
15
16
16
16
17
17
Feels °C
15
13
15
12
11
14
12
12
11
14
17
15
16
14
15
15
13
15
15
14
15
14
  • 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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