Backdoor 4 Surf Break

Lat Long: 33.28° S 151.57° E

Backdoor 4 Surf Forecast and Surf Report

Issued: 3 pm 25 Aug 2026 (local time)

Forecast update in  hr  min

Today's Backdoor 4 sea temperature is
17.6°C
0.6° 

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 25 Aug 2026:

  • Best quality surf: Thursday 27 Aug, 10AM (local time) - 6ft (1.8m), 9s period, S swell with offshore winds.
  • Most powerful swell: Monday 31 Aug, 4AM (local time) - 3.5ft (1.1m), 17s period, S swell with 667 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 26 Aug, 10AM (local time) - 3.5ft (1.0m), 8s 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 (Aug 26) at 10AM. The primary swell is predicted to be 1.0m and 8s period with a secondary swell of 0.3m and 16s. 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 1.1m 17s and forecast to arrive on Monday (Aug 31) at 4AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Wednesday (Aug 26) at 4PM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+)10AM (Wed 26th Aug)3.5ft (1.0m) 8s
Best Surf10AM (Thu 27th Aug)6ft (1.8m) 9s
Most Powerful 4AM (Mon 31st Aug)3.5ft (1.1m) 17s

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


The Lowdown

Alright, let’s break down what’s going on at Backdoor 4. There’s a slow start, but once we get past midweek, the swell starts talking and the conditions get real clean.

Right now, the water temp is about 64°F, which is pretty much normal for this time of year – nothing unusual.

Tuesday afternoon kicks off with light rain, a weak 3ft swell from the east-northeast at a short 7 seconds, and a gentle onshore breeze. The energy is weak (165), and the surf is pretty poor. Not worth suiting up.

Wednesday morning sees a small improvement – still 3ft, but the period bumps to 8 seconds and the wind goes cross-offshore, leaving the surf clean but really ordinary. That afternoon, a strong south wind at 19 mph blows offshore, but the swell drops to 3ft with only 115 energy – still not great.

Thursday morning is where things start to fire. The swell jumps to 6ft from the south, period 9 seconds, and the energy is moderate (576). The wind is light offshore from the south at 6 mph, making for clean, punchy waves. This is a solid option for intermediates and up. Thursday afternoon holds up with 6ft, cross-offshore wind, and clean conditions.

Friday is the standout. Friday morning goes glassy – zero wind from the southwest – with a 5ft south swell, period 11 seconds, and strong energy (703). That’s groundswell pushing through, and with the glassy surface, Backdoor 4 will be dialed. The waves will have real shape and power, and the longer gaps between sets will make paddling out easier. This is the best session of the forecast. Friday afternoon stays clean with a moderate offshore breeze from the SSE.

Saturday morning keeps it rolling: 5ft from the south-southeast, period 11 seconds, light offshore south wind, and energy at 875 – very strong. Clean, powerful, and consistent. This is another top-tier session. Saturday afternoon eases a touch but still clean.

The quality continues into Sunday with a 5ft south swell in the afternoon and a moderate offshore breeze, and Monday morning is glassy again with a 4ft south swell, 10-second period, and 717 energy – that’s a strong, clean session to start the week.

But from Tuesday, September 1st onward, the bottom drops out. The wind turns cross-onshore, the swell fades, and the energy drops hard. By Wednesday and Thursday, we’re looking at 1ft to 2ft waves with weak energy (55–102). It’s flat. Friday and Saturday of the second week have a little bump in swell height (4ft) but the wind is onshore or cross-onshore, and the conditions are poor. The energy is moderate at best, but the quality just isn’t there.

Towards the very end of the second week, there’s a glimmer on Wednesday, September 9th – a 5ft south swell with cross-offshore wind and clean conditions, but it’s marginal. The afternoon of the 9th actually looks good: 4ft from the south-southeast, offshore wind, and clean. That’s worth a look if you’re still around.

So, the clear winner here is Friday, August 28th morning – glassy, 5ft south groundswell, strong energy, and clean. Saturday morning, August 29th, is a close second. After that, it’s a waiting game with a long flat spell, but the very end of the run might offer a small window.

Rusty.

Short Range Forecast

Moderate rain (total 17mm), heaviest on Tue afternoon. Very mild (max 18°C on Wed morning, min 12°C on Thu night). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Very mild (max 16°C on Sun morning, min 13°C on Sat night). Wind will be generally light.

Tue
25
Wednesday
26
Thursday
27
Friday
28
Saturday
29
Sunday
30
Monday
31
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
1
0
2
3
3
1
3
3
2
3
3
1
2
2
3
3
1
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
ENE
7
1.2
ENE
8
1
ENE
8
0.9
ENE
8
1.6
S
7
1.8
S
9
1.7
S
9
1.4
S
9
1.6
S
11
1.5
S
11
1.3
SSE
10
1.4
SSE
11
1.3
SSE
10
1
S
9
1.1
S
9
1.6
S
9
1
S
17
1.3
S
10
1.3
S
10
1.2
S
11
Wave Graph
Metric surfscale
Energy kJ
114
158
130
100
250
505
440
299
629
516
318
441
382
166
185
421
572
374
326
332
Wind (km/h)
15
NNW
15
NW
15
SW
30
S
20
S
10
S
15
SE
5
NW
0
SW
20
SSE
15
SSE
10
S
5
ESE
10
W
10
SSW
20
S
10
WSW
5
SSW
15
ENE
15
N
Wind State
on
cross-on
cross-off
off
off
off
cross-off
cross-on
glassy
off
off
off
cross-off
cross
cross-off
off
cross-off
glassy
cross
on
High Tide
6:27PM1.49m
7:06AM1.09m
7:05PM1.54m
7:41AM1.17m
7:40PM1.57m
8:15AM1.25m
8:15PM1.57m
8:49AM1.32m
8:50PM1.54m
9:24AM1.38m
9:27PM1.47m
10:01AM1.42m
10:07PM1.38m
Low Tide
1:12AM0.24m
12:39PM0.37m
1:43AM0.18m
1:19PM0.32m
2:14AM0.13m
1:59PM0.28m
2:44AM0.10m
2:39PM0.26m
3:14AM0.10m
3:21PM0.25m
3:46AM0.12m
4:05PM0.26m
mod rain
mod rain
rain showers
thunderstorm
part cloud
part cloud
clear
clear
clear
part cloud
part cloud
part cloud
clear
clear
part cloud
clear
part cloud
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:20
6:18
6:16
6:16
6:15
6:13
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:30
5:30
5:31
5:32
5:32
5:34
5:34
 mm
6
7
3
1
Temp °C
17
16
18
16
16
15
15
15
15
15
15
14
15
14
16
15
15
16
16
15
Feels °C
16
15
16
12
12
13
13
15
13
12
13
12
14
13
13
11
14
15
14
12
  • 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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