Backdoor 4 Surf Break

Lat Long: 33.28° S 151.57° E

Backdoor 4 Surf Forecast and Surf Report

Issued: 9 pm 30 Aug 2026 (local time)

Forecast update in  hr  min

Today's Backdoor 4 sea temperature is
18.2°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 30 Aug 2026:

  • Best quality surf: Sunday 6 Sep, 1PM (local time) - 5ft (1.5m), 10s period, S swell with cross-offshore winds.
  • Most powerful swell: Sunday 6 Sep, 10AM (local time) - 6ft (1.8m), 11s period, S swell with 814 kJ wave energy.
  • Next surfable swell (1★+): Thursday 3 Sep, 1PM (local time) - 1.5ft (0.5m), 10s 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 Thursday (Sep 03) at 1PM. The primary swell is predicted to be 0.5m and 10s period with a secondary swell of 0.3m and 10s. 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 1.8m 11s and forecast to arrive on Sunday (Sep 06) at 10AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 6s period and expected on Friday (Sep 04) at 1AM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+) 1PM (Thu 3rd Sep)1.5ft (0.5m) 10s
Best Surf 1PM (Sun 6th Sep)5ft (1.5m) 10s
Most Powerful10AM (Sun 6th Sep)6ft (1.8m) 11s

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


The Lowdown

Yo, this is Rusty. Let's talk about what's shaping up at Backdoor 4. This is a reef break, very consistent, and it's an exposed spot that likes swell from the east. The water temp is sitting about average for this time of year, nothing weird there.

Right now, we're looking at Sunday afternoon, the 30th of August, and it's already looking clean. You've got a 3 ft south swell rolling in with a 9-second period, and the wind is a light cross-off breeze from the ESE at 6 mph. The combined energy of all swells is moderate at 271. It's a solid, clean start.

Monday the 31st, the morning is a bit of a letdown. The swell is 4 ft from the south, but with a cross-on wind from the NE at 3 mph, it's just not clean. The afternoon gets worse with a stronger cross-on from the ENE at 12 mph, dropping the swell to 2 ft and a very long 15-second period, but the energy is still moderate at 288. It's choppy and not worth it.

Tuesday the 1st of September is a write-off. All day, it's onshore wind from the north, 9-12 mph, with a small 3 ft south swell. Poor conditions.

Wednesday the 2nd, the morning is still poor with cross-on wind, but the afternoon is a different story. The wind swings to the WSW at 3 mph, becoming a light cross-off, and the 2 ft south swell with a 10-second period cleans up nicely. The energy is weak at 118, but it's surfable, just very ordinary.

Thursday the 3rd, the morning has a light cross-off from the WSW at 9 mph, keeping the 2 ft swell clean, but the energy is weak at 113. It's still just ordinary. The afternoon, the wind is cross-off from the ESE, but the swell drops to 2 ft and the energy is very weak at 78.

Friday the 4th of September, the morning is a standout. The wind goes glassy, dead calm from the NE at 3 mph, with a clean 3 ft south swell at 11 seconds. The energy is moderate at 265. This is a window of perfection. The afternoon, however, gets blown out by a strong cross-on from the ENE at 16 mph.

The weekend is a mixed bag. Saturday the 5th is a no-go with strong onshore winds. Sunday the 6th, however, is a real highlight. The morning has a clean offshore wind from the south at 6 mph, and a solid 6 ft south swell at 11 seconds. The combined energy is strong at 819. That's a powerful, clean wave for an intermediate, but it's almost too big for beginners. The afternoon drops off with a cross-off wind and a smaller swell.

The next week is quiet. Monday the 7th through Thursday the 10th of September, the surf is small, mostly under 3 ft, with poor or ordinary conditions. There's a two-day gap with nothing worthwhile.

Then, Friday the 11th of September is a monster. The morning brings a 10 ft south swell with a 10-second period, and the combined energy is a massive 1767. However, the wind is a light cross-shore from the east at 3 mph. The problem is that the swell is predicted to be too big for this break. This is expert-only territory, and even then, it might be a washing machine. The afternoon is still big at 7 ft but marginal.

Saturday the 12th, the swell is still a solid 5 ft, but cross-on wind makes it poor.

The final standout is Sunday the 13th of September. The morning is glassy again, with a clean 3 ft south swell at 11 seconds and a moderate energy of 265. It's a beautiful, clean session to wrap up the run.

So, if you're looking for the best of the best, you've got two true standouts: Friday morning the 4th of September with that glassy, clean 3 ft swell, and Sunday morning the 6th of September with the bigger, cleaner 6 ft groundswell. The Friday is more for everyone, while the Sunday is for the more experienced crew. The 11th of September is a massive, expert-only wave, but it's a gamble if it's too big.

This is Rusty, signing off.

Short Range Forecast

Mostly dry. Warm (max 27°C on Wed morning, min 14°C on Sun night). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Warm (max 28°C on Sat morning, min 13°C on Thu night). Winds increasing (calm on Thu afternoon, fresh winds from the NW by Sat morning).

Monday
31
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
1
0
1
0
0
0
0
0
0
0
1
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)
1.1
S
9
0.6
S
16
0.6
S
15
0.9
S
9
1
S
11
0.9
S
11
0.8
S
10
0.7
S
10
0.6
S
11
0.5
S
10
0.5
S
10
0.5
S
10
0.4
SSE
10
0.7
S
11
0.7
S
11
0.6
S
10
0.7
S
10
0.6
S
10
0.2
E
11
Wave Graph
Metric surfscale
Energy kJ
210
174
157
140
242
185
138
104
79
50
51
54
33
112
110
78
102
66
9
Wind (km/h)
5
WNW
5
NE
20
ENE
10
N
15
N
25
N
15
NNW
20
NW
15
WNW
15
NW
15
W
15
ESE
10
W
10
NNE
25
ENE
15
NNW
25
NW
25
WNW
20
WSW
Wind State
glassy
cross-on
cross-on
on
on
on
cross-on
cross-on
cross-on
cross-on
cross
cross-off
cross
cross-on
cross-on
on
cross-on
cross
cross-off
High Tide
10:01AM1.42m
10:07PM1.38m
10:41AM1.45m
10:52PM1.27m
11:26AM1.45m
11:44PM1.14m
12:20PM1.44m
00:50AM1.03m
1:25PM1.43m
2:14AM0.96m
2:40PM1.44m
3:44AM0.96m
Low Tide
3:46AM0.12m
4:05PM0.26m
4:20AM0.17m
4:55PM0.29m
4:57AM0.24m
5:52PM0.33m
5:42AM0.32m
7:00PM0.37m
6:36AM0.40m
8:22PM0.37m
7:47AM0.46m
9:46PM0.33m
clear
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:13
6:11
6:11
6:09
6:07
6:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:34
5:35
5:36
5:36
5:37
5:37
 mm
Temp °C
16
16
16
16
24
25
20
27
27
22
21
20
17
17
18
19
28
28
19
Feels °C
16
15
13
14
19
19
17
24
23
19
17
16
14
13
13
15
22
23
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 
submit an eyeball surf report

Quick surf report for Backdoor 4:

join our community of surf reporters

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.


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.

Nearest locationNearest