Backdoor Surf Break

Lat Long: 21.67° N 158.05° W

Backdoor Surf Forecast and Surf Report

Issued: 7 am 19 Jul 2026 (local time)

Forecast update in  hr  min

Today's Backdoor sea temperature is
26.2° C
0.0° 

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


Backdoor surf forecast from 19 Jul 2026:

  • Most powerful swell: Sunday 26 Jul, 11AM (local time) - 6ft (1.9m), 8s period, NE swell with 423 kJ wave energy.

Best Forecast Surf Conditions for Backdoor this week:

The most powerful waves expected at Backdoor in the next 16 days are 1.9m 8s and forecast to arrive on Sunday (Jul 26) at 11AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.2m 7s period and expected on Thursday (Jul 23) at 8AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11AM (Sun 26th Jul)6ft (1.9m) 8s

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


The Lowdown

Right, grab a coffee, this is gonna be a long one. To be straight with you, the next 16 days look grim for a paddle. I'm looking at Backdoor, and it's a tough run. The water temp is sitting at 79°, which is pretty much average for this time of year, so at least you won't be freezing while you're sitting there getting frustrated.

Kicking off Sunday the 19th, we've got a tiny 1 ft WNW swell with a 12-second period, but the ENE wind is 16 mph and cross-offshore. The combined energy is a measly 29. It's clean, but there's just no push. The score is a zero. This flat spell hangs around, with nothing but tiny dribbles and zeros right through the week. Monday the 20th sees 0.7 ft, and Tuesday through Thursday are completely flat – zero swell energy. Friday the 24th teases with a 0.7 ft NNW swell, but it's a 9-second period and the energy is only 7. It's a total write-off. We're looking at a solid 5-day gap with nothing to recommend.

Then, finally, a pulse shows up. Sunday the 26th of July, the swell jumps to 6 ft from the NE. That's a big jump, but it's short period at 8 seconds. The combined energy climbs to 423, which is moderate wave energy. It's clean with the cross-offshore wind, but the score only gets a 1 out of 10, flagged as marginal. The swell is over 5 ft, so it's edging out of beginner territory. Monday the 27th is similar, with 5 ft NE swell and 276 energy. Again, the score is a 1. It's in the water, but it's not lining up well.

The second week is a bit of a mixed bag, but still not brilliant. Tuesday the 28th drops to 3 ft, and by the afternoon the wind goes cross-shore, creating a chop. Thursday the 30th is light wind at 6 mph, but the swell is only 3 ft. The standout in this whole period is actually Friday the 31st of July. We get a 4 ft NE swell with a 10-second period, and the combined energy jumps to 331. It's still a marginal call (score of 1), but the 10-second period is better than the 8-second stuff from the week before. The wind is 12 mph cross-offshore, keeping it clean. This is the best on offer, but it's a long way off and not a guarantee.

So, for the here and now, don't bother. The first real chance is that Sunday the 26th pulse, but it's short-period and marginal. The best bet is to pencil in Friday the 31st for a look, but don't get your hopes up. It's going to be a tough two weeks.

Rusty.

Short Range Forecast

Light rain (total 5mm), mostly falling on Mon morning. Warm (max 26°C on Sun morning, min 24°C on Sun night). Wind will be generally light.

Days 4-6 Weather Summary

Some drizzle, heaviest during Fri night. Warm (max 26°C on Wed afternoon, min 24°C on Wed morning). Mainly fresh winds.

Sunday
19
Monday
20
Tuesday
21
Wednesday
22
Thursday
23
Friday
24
Saturday
25
AM
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
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.3
WNW
12
0.3
WNW
12
0.2
WNW
12
0.2
W
12
0.2
W
12
1.4
ENE
7
1.5
ENE
7
1.5
ENE
7
0.3
SW
15
1.4
ENE
7
1.7
ENE
6
1.6
ENE
6
1.8
ENE
7
1.7
ENE
7
0.3
NNW
9
0.2
NNW
9
0.2
NNW
8
0.2
N
8
2.1
ENE
8
0.1
W
9
1
E
16
Wave Graph
Metric surfscale
Energy kJ
29
29
14
11
11
0
0
0
36
0
0
0
0
0
16
7
7
5
0
2
0
Wind (km/h)
25
ENE
25
ENE
25
ENE
20
ENE
25
ENE
20
ENE
20
ENE
25
ENE
25
E
25
E
25
ENE
25
E
30
ENE
30
ENE
25
E
25
E
30
ENE
25
E
30
ENE
30
ENE
20
ENE
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
cross-off
High Tide
5:45PM0.58m
8:57AM0.47m
5:34PM0.52m
11:07AM0.54m
12:06PM0.60m
12:43PM0.65m
1:15PM0.69m
1:45PM0.72m
Low Tide
11:17AM0.35m
1:17AM0.19m
12:21PM0.45m
1:51AM0.18m
2:33AM0.17m
3:26AM0.15m
4:23AM0.14m
5:17AM0.11m
clear
clear
clear
rain showers
clear
rain showers
rain showers
rain showers
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
rain showers
rain showers
rain showers
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:58
6:00
6:00
6:01
6:01
6:01
6:01
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:16
7:15
7:15
7:15
7:15
7:15
7:14
 mm
1
1
2
1
1
1
1
Temp °C
26
26
25
25
26
25
26
26
25
25
26
25
25
26
24
26
26
24
25
25
24
Feels °C
24
24
24
24
25
24
26
25
24
23
25
24
23
24
22
24
24
21
24
23
22
  • Map Icons:
  • Break
  • 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 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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