Backdoor Surf Break

Lat Long: 21.67° N 158.05° W

Backdoor Surf Forecast and Surf Report

Issued: 1 pm 23 Aug 2026 (local time)

Forecast update in  hr  min

Today's Backdoor sea temperature is
27.1°C
0.3° 

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


Backdoor surf forecast from 24 Aug 2026:

  • Most powerful swell: Monday 24 Aug, 2AM (local time) - 2ft (0.6m), 11s period, NW swell with 101 kJ wave energy.

Best Forecast Surf Conditions for Backdoor this week:

The most powerful waves expected at Backdoor in the next 16 days are 0.6m 11s and forecast to arrive on Monday (Aug 24) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 7s period and expected on Tuesday (Aug 25) at 2PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2AM (Mon 24th Aug)2ft (0.6m) 11s

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


The Lowdown

Alright, let's get into it. This is Rusty.

Right off the bat, I gotta be straight with you—this 16-day window is looking bleak. We’ve got a long, dry stretch of hardly any surf on offer, so don’t get your hopes up for any decent waves for a while.

The only spot on the map is Backdoor. It's a reef break, exposed to swell, and it’s looking for that optimum NW direction. The water temp is sitting at 81° with a 0.5° anomaly, so pretty average for this time of year.

For the first week, from Sunday the 23rd of August all the way through to Saturday the 30th, it’s a write-off. We’re talking tiny, knee-to-waist high junk, with swell heights barely hitting 2 ft and periods around 9-11 seconds. The combined energy is weak, sitting between 13 and 86, so there’s just no power behind it. The wind is a constant cross-off from the ENE at 15-19 mph, which keeps the surface clean, but there’s nothing to ride. It’s all “poor surf conditions” every single day.

There’s a brief flicker of hope on Monday the 31st of August. The swell bumps up to 5 ft from the NE, but look at that period—only 7 seconds. That’s short-period wind swell, all chop and no push. The combined energy hits 179, so it’s got some grunt, but the quality just isn’t there for a decent paddle. With those conditions and the reef setup, it honestly looks more interesting for kite surfing than for paddling out on a surfboard.

Then we crash again. From Tuesday the 1st of September right through to the end of the forecast on Monday the 7th of September, it’s back to flat or near-flat. Swell heights drop to 0.7 ft or nothing at all. There’s a little blip on the 7th with a 1 ft NW swell and a 12-second period, but with only 35 energy, it’s just not worth the paddle.

So yeah, it’s a tough run. The one standout, if you can even call it that, is the 31st of August morning at Backdoor if you’re desperate for something with a little push, but don’t expect any quality. Crowds are likely there, and with conditions like this, everyone will be scratching for a wave.

This is a blank run for the area. It happens.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 27°C on Sun afternoon, min 25°C on Sun night). Mainly fresh winds.

Days 5-7 Weather Summary

Mostly dry. Warm (max 26°C on Wed afternoon, min 25°C on Wed night). Mainly fresh winds.

Sun
23
Monday
24
Tuesday
25
Wednesday
26
Thursday
27
Friday
28
Saturday
29
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
0
0
0
0
0
0
0
0
0
0
0
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)
0.6
WNW
10
0.6
NW
11
0.5
NW
11
0.5
NW
10
0.4
NW
9
0.4
NW
10
0.4
NW
9
0.4
NW
9
0.4
NW
10
0.4
NW
10
0.4
NW
10
0.4
NW
9
0.4
NW
9
0.4
NW
9
0.4
NW
9
0.4
NW
9
0.3
NW
9
0.3
NW
9
0.3
NW
9
0.2
WNW
9
Wave Graph
Metric surfscale
Energy kJ
68
101
55
48
21
23
23
22
27
27
34
22
22
21
22
22
13
13
13
8
Wind (km/h)
30
ENE
30
E
30
ENE
25
E
25
E
30
E
30
E
30
E
30
E
25
ENE
25
ENE
25
ENE
25
ENE
20
E
30
E
30
ENE
25
ENE
30
E
25
E
30
E
Wind State
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
11:38PM0.32m
1:41PM0.73m
00:27AM0.35m
2:03PM0.74m
1:07AM0.39m
2:24PM0.74m
1:46AM0.43m
2:44PM0.72m
2:26AM0.48m
3:02PM0.70m
3:07AM0.51m
3:19PM0.65m
3:51AM0.55m
Low Tide
9:01PM0.30m
5:49AM0.11m
8:51PM0.29m
6:29AM0.09m
8:55PM0.28m
7:06AM0.09m
9:04PM0.26m
7:41AM0.10m
9:16PM0.24m
8:16AM0.14m
9:30PM0.21m
8:53AM0.19m
9:47PM0.18m
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
part cloud
clear
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:13
6:13
6:13
6:13
6:13
6:13
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:55
6:54
6:53
6:53
6:52
6:52
6:51
 mm
Temp °C
27
26
27
27
26
26
27
25
26
26
25
25
26
25
26
26
25
26
26
25
Feels °C
26
26
27
27
27
25
25
24
23
24
23
24
25
23
24
24
23
24
24
24
  • 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
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Information about the Backdoor Surf forecast

The above surf forecast table for Backdoor provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Backdoor can be found by selecting the local surf guide option on the grey menu. Our Backdoor 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) 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 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 is 19 km (12 miles) from Wahiawa. If you plan a vacation in Oahu, look for hotels and other accommodation in Wahiawa. Wahiawa has rooms for a wide range of budgets as well as car hire and transport links.

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