Backdoor surfForecast / HAW – Oahu / USA

information circle12 Day Weather and Surf, issued 7 am Saturday 13 Dec 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
25.8° C
(Which is slightly warmer than usual)


Best Forecast Surf Conditions for Backdoor this week:

The surf forecast for Backdoor over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Dec 14) at 8AM. The primary swell is predicted to be 1.4m and 9s period with a secondary swell of 0.8m and 15s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Backdoor in the next 12 days are 2.4m 13s and forecast to arrive on Sunday (Dec 14) at 8PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Wednesday (Dec 17) at 5PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Sun 14th Dec)4.5ft (1.4m) 9s
Best Surf 5PM (Sun 14th Dec)8ft (2.4m) 14s
Most Powerful 8PM (Sun 14th Dec)8ft (2.4m) 13s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Moderate rain (total 11mm), heaviest on Mon morning. Warm (max 26°C on Sat afternoon, min 23°C on Sat night). Wind will be generally light.

Days 3-6 Weather Summary Light rain (total 3mm), mostly falling on Wed night. Warm (max 27°C on Tue afternoon, min 23°C on Tue morning). Wind will be generally light.

Saturday
13
Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
1
1
0
3
4
4
4
4
4
3
2
3
3
3
3
2
2
3
3
2
2
Swell
Height Map
Wave Height (m) & direction (?)
1.5
NNW
1.2
NNW
0.8
NNW
1.6
WNW
2.4
NW
2.2
NW
2
N
2
N
1.7
N
1.6
N
1.4
N
1.3
N
1.4
WNW
1.8
WNW
1.7
WNW
1.5
WNW
1.1
N
1.1
N
1.2
N
1.2
N
1.1
N
Period(s) (?)101010111413121414131213131312111212121111
Wave
Graph
(?)Metric surfscale
Energy kJ (?)441318129606199016841229158110488225635726201077861515368341384358300
Wind
(km/h)
25
SSW
25
SSW
20
SW
10
WSW
0
SSW
10
S
5
SSE
15
SSE
5
S
10
S
20
S
15
S
20
S
20
SSW
15
S
20
SSW
15
SSW
10
S
10
SSE
10
SE
0
NNE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
cross-
off
crosscross-
on
glasscross-
off
cross-
off
offcross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
offoffglass
High Tide
/ height (m)
8:40AM
0.49
12:43AM
0.58
9:04AM
0.45
1:09AM
0.65
9:36AM
0.41
1:36AM
0.70
10:21AM
0.38
2:04AM
0.74
11:13AM
0.36
2:34AM
0.77
11:55AM
0.35
3:06AM
0.78
12:30PM
0.34
3:39AM
0.78
Low Tide
/ height (m)
4:39PM
0.16
7:07AM
0.44
5:03PM
0.13
8:45AM
0.41
5:28PM
0.10
9:27AM
0.38
5:57PM
0.07
9:55AM
0.35
6:28PM
0.05
10:22AM
0.34
7:01PM
0.03
10:51AM
0.34
7:33PM
0.02
Saturday
13
Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Sunrise7:01--7:01--7:01--7:03--7:03--7:03--7:03--
Sunset-5:51--5:51--5:52--5:52--5:52--5:52--5:52-
clear
clear
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
clear
clear
clear
part cloud
clear
clear
thunderstorm
clear
clear
clear
clear
thunderstorm
thunderstorm
Rain (mm)
--112151------3----12
Temp. °C252624252524242524252724262624252724252624
Feels °C (?)232424272727262626272725262525252726272826
  • 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 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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