Backdoor surfForecast / HAW – Oahu / USA

information circle12 Day Weather and Surf, issued 7 am Wednesday 17 Sep 2025 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
26.7° C
(Which is normal for this time of year)


Best Forecast Surf Conditions for Backdoor this week:

The most powerful waves expected at Backdoor in the next 12 days are 1.6m 7s and forecast to arrive on Saturday (Sep 20) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.1m 7s period and expected on Saturday (Sep 20) at 2PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 8AM (Sat 20th Sep)5ft (1.6m) 7s

Table - best surf conditions forecast for Backdoor over the next 12 days.

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Light rain (total 2mm), mostly falling on Fri afternoon. Warm (max 26°C on Wed morning, min 25°C on Wed morning). Mainly fresh winds.

Days 3-6 Weather Summary Light rain (total 2mm), mostly falling on Mon night. Warm (max 26°C on Sat morning, min 25°C on Sat morning). Mainly fresh winds.

Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.3
NNW
0.4
NNW
0.7
N
0.7
N
0.7
N
0.5
N
0.7
N
0.7
N
1.4
NE
0.4
NW
0.4
NW
0.5
NW
0.5
NW
0.5
NW
0.4
NW
0.4
NNW
0.4
NNW
0.4
NNW
0.4
NW
0.4
NW
0.4
NW
Period(s) (?)89888111010713131211101012111110109
Wave
Graph
(?)Metric surfscale
Energy kJ (?)14266154555610698209405868585435534744242321
Wind
(km/h)
25
E
25
ENE
30
E
30
E
25
E
25
ENE
25
ENE
25
ENE
25
ENE
30
ENE
25
ENE
25
E
25
E
25
E
20
ENE
25
E
25
ENE
25
E
30
E
25
ENE
25
E
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
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
/ height (m)
12:49PM
0.73
12:28AM
0.38
1:17PM
0.72
1:08AM
0.44
1:41PM
0.70
1:44AM
0.50
2:01PM
0.66
2:19AM
0.55
2:19PM
0.62
2:53AM
0.59
2:33PM
0.57
3:27AM
0.62
2:44PM
0.53
4:02AM
0.63
Low Tide
/ height (m)
7:58PM
0.25
6:03AM
0.15
8:04PM
0.23
6:49AM
0.15
8:13PM
0.21
7:30AM
0.17
8:25PM
0.19
8:08AM
0.21
8:38PM
0.17
8:46AM
0.25
8:52PM
0.14
9:25AM
0.29
9:06PM
0.13
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Sunrise6:18--6:18--6:20--6:20--6:20--6:20--6:20--
Sunset-6:32--6:31--6:30--6:30--6:29--6:28--6:27-
clear
clear
clear
clear
clear
clear
clear
thunderstorm
thunderstorm
clear
clear
clear
clear
clear
part cloud
clear
clear
thunderstorm
clear
clear
clear
Rain (mm)
-------11--------2---
Temp. °C262625262625262625262625262625262625262625
Feels °C (?)242424242524262524252524252525252524252424
  • 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

Eyeball surf reportRecent Eyeball Surf Reports for HAW - Oahu

  1. weather stationWind Update Offshore wind has become cross-off at Backdoor (light winds from the ENE at Wheeler Air Force Base/oahu Airport 23 km from Backdoor). 0.3m 8s swell from the N with a 0.1m 14s groundswell from the SW. 2 swells combining to make bigger set waves.

    Backdoor
  2. weather stationWind Update Cross-off wind 3 km from Waikiki has become light (light winds from the ENE at Saint Louis Heights wx). Waves should be turning clean at Waikiki. 0.5m 10s swell from the SSE with a 0.3m 11s groundswell from the S and a 0.2m 13s groundswell from the WSW. 3 swells combining to make bigger set waves.

    Waikiki
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23 km away, 1 h 14 min ago

19 km/h
ENE
0.0
26.7
Air / Water (°C)
Please reload the page to see if there are any updates.

FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Backdoor surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.


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 12 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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