Backdoor surfForecast / HAW – Oahu / USA

information circle16 Day Weather and Surf, issued 7 am Wednesday 13 May 2026 HST
Forecast update in hr  min  s Forecast update imminent
Backdoor surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Backdoor sea temperature is
25.2° C
(Which is normal for this time of year)

Best Forecast Surf Conditions for Backdoor this week:

The surf forecast for Backdoor over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (May 15) at 8AM. The primary swell is predicted to be 1.3m and 13s period. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Backdoor in the next 16 days are 1.4m 14s and forecast to arrive on Thursday (May 14) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 7s period and expected on Wednesday (May 13) at 8PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Fri 15th May)4.5ft (1.3m) 13s
Best Surf 8AM (Fri 15th May)4.5ft (1.3m) 13s
Most Powerful 8PM (Thu 14th May)4.5ft (1.4m) 14s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Moderate rain (total 10mm), heaviest on Fri afternoon. Warm (max 25°C on Thu afternoon, min 23°C on Wed morning). Mainly fresh winds.

Days 4-6 Weather Summary

Light rain (total 3mm), mostly falling on Sun afternoon. Warm (max 26°C on Sun morning, min 23°C on Mon night). Wind will be generally light.

Wednesday
13
Thursday
14
Friday
15
Saturday
16
Sunday
17
Monday
18
Tuesday
19
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
1
2
2
2
2
2
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)
0.7
NNW
9
0.3
NW
18
0.7
NW
16
1.1
NW
15
1.4
NW
14
1.4
NW
13
1.1
NW
12
1
NW
12
0.8
NW
11
0.7
NW
11
0.7
NW
11
0.6
NNW
10
0.6
NNW
10
0.4
NNW
10
0.4
NNW
9
0.4
NW
14
0.6
NNW
13
0.7
NW
11
0.6
NW
10
0.6
NW
10
0.7
NW
10
Wave Graph
Metric surfscale
Energy kJ
73
50
271
558
731
632
379
282
147
121
119
68
67
38
32
52
114
126
82
80
112
Wind (km/h)
30
E
30
ENE
25
ENE
25
ENE
25
ENE
20
E
15
E
15
E
20
ESE
20
E
20
E
15
E
15
ESE
15
E
20
ESE
20
E
25
E
25
E
25
ENE
30
ENE
30
E
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
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
1:14PM0.65m
11:43PM0.50m
1:54PM0.74m
00:13AM0.46m
2:36PM0.81m
00:41AM0.41m
3:20PM0.85m
1:06AM0.38m
4:08PM0.86m
1:19AM0.36m
4:58PM0.84m
5:51PM0.81m
Low Tide
7:11PM0.36m
6:27AM0.05m
8:18PM0.36m
6:55AM-0.00m
9:24PM0.36m
7:27AM-0.03m
10:33PM0.36m
8:03AM-0.05m
11:58PM0.35m
8:41AM-0.04m
9:21AM-0.00m
clear
clear
clear
clear
part cloud
clear
thunderstorm
thunderstorm
thunderstorm
clear
clear
part cloud
clear
rain showers
rain showers
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:54
5:54
5:52
5:52
5:52
5:52
5:52
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:01
7:02
7:02
7:04
7:04
7:05
7:05
1
5
4
2
1
Temp °C
24
24
23
24
25
24
25
24
23
25
25
24
26
26
24
25
25
24
24
24
24
21
21
20
22
24
24
25
25
23
25
25
24
28
27
25
25
25
23
23
22
23
Swell 1
Height (m)
Direction
Period (s)
0.7
NNW
9
0.5
NW
9
0.7
NW
16
1.1
NW
15
1.4
NW
14
1.4
NW
13
1.1
NW
12
1
NW
12
0.8
NW
11
0.7
NW
11
0.7
NW
11
1.6
ENE
8
0.6
NNW
10
0.4
NNW
10
0.4
NNW
9
0.4
SW
14
0.6
NNW
13
0.7
NW
11
0.6
NW
10
0.6
NW
10
0.7
NW
10
Energy kJ
73
39
271
558
731
632
379
282
147
121
119
310
67
38
32
50
114
126
82
80
112
Swell 2
Height (m)
Direction
Period (s)
0.2
SSW
15
0.4
N
9
0.4
N
8
0.5
N
8
0.4
N
8
0.4
N
8
0.4
SW
16
0.7
N
8
0.5
N
6
0.4
SW
15
0.4
SW
15
0.6
NNW
10
0.4
SW
14
0.4
SW
14
0.4
SW
14
0.4
NW
14
0.4
SW
14
0.4
SW
14
0.4
NNW
12
0.3
NNW
12
0.3
SSW
15
Energy kJ
21
26
22
33
22
22
64
63
19
57
55
68
54
54
51
52
49
46
56
29
44
Swell 3
Height (m)
Direction
Period (s)
0.1
N
10
0.3
NW
18
0.4
NW
9
0.5
NW
11
0.2
SSW
14
0.3
SW
16
0.3
N
8
0.4
SW
16
0.3
SW
16
0.3
NNW
13
0.1
S
10
0.2
SSW
15
0.1
SE
11
0.2
SSW
21
0.2
NNW
15
0.3
NNW
9
0.2
NNW
9
0.3
NNW
13
0.4
SW
18
0.3
SW
13
0.1
SW
16
Energy kJ
2
50
27
60
18
43
12
64
40
35
2
21
5
45
21
16
7
35
79
27
10
Wind waves
Height (m)
Direction
Period (s)
1.7
ENE
7
1.8
ENE
7
1.9
ENE
7
1.8
ENE
7
1.7
ENE
7
1.6
ENE
8
1.5
ENE
8
1.4
E
8
1.7
E
8
1.7
ENE
8
1.7
ENE
8
1.6
E
8
1.6
E
8
1.6
E
8
1.7
E
8
1.7
E
8
1.8
E
8
1.5
E
8
1.5
E
7
1.8
ENE
7
Energy kJ
268
299
335
310
286
316
246
235
350
383
392
358
358
358
386
377
362
272
245
308
Nearest Offshore or Glassy
Rating
(10 max)
1
1
2
3
3
3
2
2
2
1
1
1
1
2
1
1
1
1
1
2
2
Distance (km)
24
24
5
24
2
2
0
0
0
2
2
0
0
6
2
2
2
2
2
24
24
Best forecast wave conditions in Oahu
Rating
(10 max)
1
1
2
3
3
3
3
3
2
2
2
2
2
2
1
1
1
1
1
2
2
Best forecast wave conditions in United States
Rating
(10 max)
1
1
4
3
3
4
3
3
2
2
2
4
2
2
4
4
1
3
1
4
4
Header Global
Rating
(10 max)
9
4
5
4
5
5
5
4
5
4
5
5
7
4
5
5
4
4
5
5
5
  • 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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