Backdoor 4 Surf Break

Lat Long: 33.28° S 151.57° E

Backdoor 4 Surf Forecast and Surf Report

Issued: 3 pm 20 Jul 2026 (local time)

Forecast update in  hr  min

Today's Backdoor 4 sea temperature is
18.7° C
0.4° 

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 Jul 2026:

  • Best quality surf: Friday 24 Jul, 10AM (local time) - 5.5ft (1.7m), 9s period, S swell with cross-offshore winds.
  • Most powerful swell: Saturday 25 Jul, 4AM (local time) - 6ft (1.9m), 14s period, S swell with 1,329 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 22 Jul, 1PM (local time) - 3.5ft (1.1m), 10s period with ENE 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 Wednesday (Jul 22) at 1PM. The primary swell is predicted to be 1.1m and 10s period with a secondary swell of 0.3m and 10s. Another secondary swell of 0.3m and 3s 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 1.9m 14s and forecast to arrive on Saturday (Jul 25) at 4AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 8s period and expected on Friday (Jul 24) at 4AM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+) 1PM (Wed 22nd Jul)3.5ft (1.1m) 10s
Best Surf10AM (Fri 24th Jul)5.5ft (1.7m) 9s
Most Powerful 4AM (Sat 25th Jul)6ft (1.9m) 14s

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


The Lowdown

Alright folks, Rusty here. Let's break down what's coming our way for the next sixteen days.

We're starting off a bit slow, with small and messy conditions for the first few days. Don't bother paddling out just yet. The real action fires up from Friday, July 24th, and we've got a couple of solid windows to chase.

Backdoor 4 is the only spot on the radar, a reef break that's very consistent. The water temp is sitting at 66°F, which is pretty much average for this time of year.

The first standout is Friday, July 24th. Both the morning and afternoon look clean. We've got a 6ft swell from the south, with a period of 9 seconds. The wind is light and cross-offshore, keeping the surface glassy. The combined swell energy is moderate, coming in at 523 in the morning and 526 in the afternoon. This is a fun, solid wave for an intermediate surfer here. Just keep in mind that crowds are possible, so get out there early.

The next real highlight is Sunday, July 26th, in the morning. We've got a similar 5ft south swell, but the period bumps up to 11 seconds, bringing in longer, more powerful lines. The wind is light WSW at 10 km/h, cross-offshore, and it's clean. The combined energy is a strong 574. This is a beautiful window of clean, long-period groundswell. On a reef, that longer period will wrap in and give you some proper shape.

After that, there's a bit of a lull, but the last week of the forecast is where it gets interesting for the bigger guys. On Thursday, July 30th, in the afternoon, the swell is predicted to be a substantial 7ft from the south, with a very long period of 13 seconds. The combined energy is a massive 1420. However, the wind is a moderate 15 km/h cross-onshore, which will make it choppy. At 7ft, this is getting into expert territory, especially with that onshore wind.

The biggest and best looking window is at the very end. On Monday, August 4th, we've got a pumping 8ft south-southeast swell, with a period of 12 seconds. The wind is light and cross-offshore, 10 km/h from the SE, making it clean. The combined energy is a huge 2323. This is a serious swell, and at 8ft, it's strictly for experts only at a reef like Backdoor 4. It's a promising long-range call, but we're a week out, so keep an eye on it.

All in all, the best bet is the morning of Sunday, July 26th for a clean, long-period south swell, and the very end of the run for the big stuff, but that's one for the pros.

Rusty.

Short Range Forecast

Mostly dry. Very mild (max 19°C on Wed morning, min 12°C on Mon night). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Very mild (max 19°C on Thu afternoon, min 8°C on Thu night). Winds decreasing (fresh winds from the WSW on Thu afternoon, light winds from the NNE by Fri afternoon).

Mon
20
Tuesday
21
Wednesday
22
Thursday
23
Friday
24
Saturday
25
Sunday
26
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
2
1
0
0
0
0
0
0
0
0
3
3
2
1
1
3
3
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)
1.8
ENE
11
1.6
ENE
10
1.5
ENE
10
1.4
ENE
10
1.3
ENE
10
1.2
ENE
10
0.9
ENE
10
0.9
ENE
9
0.8
ENE
9
0.8
ENE
9
0.5
ENE
9
1.7
S
9
1.7
S
9
1.4
S
16
1.7
S
12
1.4
S
11
1.4
S
12
1.5
S
11
1.4
S
11
1.3
S
10
Wave Graph
Metric surfscale
Energy kJ
763
501
416
356
312
248
159
121
92
90
44
490
490
1001
819
482
547
566
440
312
Wind (km/h)
10
NE
10
NNW
10
N
20
NE
10
N
10
WNW
10
E
20
W
20
WSW
15
SW
25
WSW
15
WSW
10
SE
20
WNW
15
W
25
SSW
15
WSW
10
WSW
15
NE
15
WSW
Wind State
cross-on
on
on
cross-on
on
cross-on
cross
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross
cross
cross-off
cross-off
cross-off
cross-on
cross-off
High Tide
00:51AM1.17m
1:51PM1.29m
1:47AM1.03m
2:45PM1.31m
2:53AM0.93m
3:42PM1.32m
4:06AM0.89m
4:36PM1.36m
5:13AM0.89m
5:27PM1.40m
6:08AM0.93m
6:12PM1.46m
Low Tide
7:01PM0.48m
7:10AM0.31m
8:11PM0.53m
7:53AM0.39m
9:26PM0.53m
8:42AM0.45m
10:38PM0.50m
9:37AM0.49m
11:38PM0.44m
10:34AM0.49m
00:26AM0.38m
11:27AM0.47m
1:07AM0.32m
clear
clear
clear
clear
clear
clear
cloud
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
cloud
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:52
6:52
6:50
6:50
6:50
6:50
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:06
5:07
5:07
5:07
5:08
5:09
5:09
 mm
Temp °C
15
15
15
16
15
19
19
17
18
19
11
13
13
11
18
18
13
15
16
15
Feels °C
13
13
12
13
12
16
15
13
14
14
3
10
10
6
14
12
8
13
14
11
  • Map Icons:
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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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