Backdoor surfForecast / HAW – Oahu / USA

information circle16 Day Weather and Surf, issued 7 pm 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 with a secondary swell of 0.3m and 8s. 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 1.5m 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 2.3m 7s period and expected on Wednesday (May 20) at 11PM.

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)5ft (1.5m) 14s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Heavy rain (total 49mm), heaviest during Fri afternoon. Warm (max 25°C on Thu afternoon, min 19°C on Fri night). Mainly fresh winds.

Days 5-7 Weather Summary

Light rain (total 3mm), mostly falling on Sat night. Warm (max 26°C on Sun morning, min 24°C on Sat night). Wind will be generally light.

Thursday
14
Friday
15
Saturday
16
Sunday
17
Monday
18
Tuesday
19
Wed
20
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Rating
(10 max)
0
1
2
2
2
2
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
Height Map
Wave
Height (m)
Direction
Period (s)
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
0.6
NW
11
0.6
NNW
10
0.6
NNW
10
0.4
NNW
10
0.4
NNW
9
0.3
NNW
9
0.4
NW
12
0.4
NW
11
0.4
NW
12
0.5
NW
10
0.4
NNW
11
0.6
NNW
10
0.5
NNW
10
Wave Graph
Metric surfscale
Energy kJ
271
558
731
632
379
282
147
121
94
68
67
38
32
16
39
43
37
51
47
65
56
Wind (km/h)
25
ENE
25
ENE
25
ENE
20
ESE
15
ESE
15
ENE
15
E
20
E
20
E
20
ESE
10
E
20
E
25
E
25
E
25
E
25
E
25
E
25
ENE
25
ENE
30
ENE
30
ENE
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
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
6:46PM0.77m
Low Tide
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
10:03AM0.06m
rain showers
clear
clear
clear
thunderstorm
thunderstorm
rain showers
clear
clear
thunderstorm
clear
thunderstorm
part cloud
clear
clear
clear
part cloud
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:54
5:52
5:52
5:52
5:52
5:52
5:50
<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
7:05
1
3
31
14
1
2
Temp °C
23
24
25
24
25
23
23
25
25
24
26
25
24
25
25
24
24
25
24
24
24
20
22
24
24
25
24
23
25
25
25
28
26
25
25
24
23
24
24
23
22
22
Swell 1
Height (m)
Direction
Period (s)
0.7
NW
16
1.1
NW
15
1.4
NW
14
1.4
NW
13
1.1
NW
12
1
NW
12
1.7
ENE
8
0.7
NW
11
0.6
NW
11
1.5
ENE
8
1.6
ENE
8
0.4
NNW
10
0.4
NNW
9
0.4
SW
14
0.4
SW
14
0.4
NW
11
0.4
NW
10
0.5
NW
10
0.4
NW
10
0.6
NNW
10
0.5
NNW
10
Energy kJ
271
558
731
632
379
282
361
121
94
280
367
38
32
50
49
43
37
51
35
65
56
Swell 2
Height (m)
Direction
Period (s)
0.4
N
8
0.5
N
8
0.4
N
8
0.3
N
8
0.4
N
8
0.4
N
8
0.8
NW
11
0.4
SW
15
0.4
SW
15
0.6
NNW
10
0.6
NNW
10
0.4
SW
14
0.4
SW
14
0.4
SW
19
0.4
NW
12
0.4
SW
14
0.4
NW
12
0.3
SW
13
0.4
NNW
11
0.4
SW
16
0.3
NW
9
Energy kJ
22
33
22
12
21
20
147
57
55
68
67
54
51
96
39
46
36
27
47
64
13
Swell 3
Height (m)
Direction
Period (s)
0.4
NW
9
0.5
NW
11
0.2
SSW
14
0.4
SW
16
0.4
SW
16
0.4
SW
16
0.2
SSW
16
0.2
NNW
13
0.1
S
10
0.2
SSW
15
0.4
SW
14
0.2
SSW
21
0.2
NNW
15
0.3
NNW
9
0.2
SSW
19
0.2
SSW
16
0.4
SW
18
0.2
NNW
12
0.3
SSW
15
0.2
WNW
10
0.3
SSW
16
Energy kJ
27
60
18
69
64
64
25
17
2
21
54
45
21
16
37
26
79
15
44
9
50
Wind waves
Height (m)
Direction
Period (s)
1.9
ENE
7
1.7
ENE
7
1.6
ENE
7
1.6
ENE
8
1.7
E
8
1.8
E
8
1.7
ENE
8
1.6
ENE
8
1.6
E
8
1.8
E
8
1.8
E
8
1.7
E
8
1.6
E
8
1.5
E
8
1.5
E
8
1.5
E
8
1.8
ENE
7
1.9
ENE
8
Energy kJ
335
286
261
308
332
387
361
350
367
439
422
377
326
286
286
286
365
385
Nearest Offshore or Glassy
Rating
(10 max)
2
3
3
3
2
2
1
1
1
1
1
1
1
2
1
1
1
1
1
2
1
Distance (km)
5
2
2
2
0
0
1
2
2
2
0
9
2
24
24
2
2
2
5
24
26
Best forecast wave conditions in Oahu
Rating
(10 max)
2
3
3
3
3
2
1
1
2
2
2
2
1
2
1
1
1
1
2
2
1
Best forecast wave conditions in United States
Rating
(10 max)
4
3
3
4
3
2
2
1
2
3
2
2
4
3
3
4
3
1
5
4
2
Header Global
Rating
(10 max)
4
5
5
5
5
5
4
7
5
5
5
4
7
4
5
5
5
5
5
5
4
  • 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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