Backdoor surfForecast / HAW – Oahu / USA

information circle16 Day Weather and Surf, issued 7 am Thursday 19 Mar 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
24.4° 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 Thursday (Mar 19) at 2PM. The primary swell is predicted to be 1.3m and 11s period. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Backdoor in the next 16 days are 3.5m 12s and forecast to arrive on Tuesday (Mar 24) at 8PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 6s period and expected on Monday (Mar 23) at 11PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 2PM (Thu 19th Mar)4.5ft (1.3m) 11s
Best Surf 2PM (Thu 19th Mar)4.5ft (1.3m) 11s
Most Powerful 8PM (Tue 24th Mar)11ft (3.5m) 12s

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 42mm), heaviest during Sat afternoon. Warm (max 26°C on Fri afternoon, min 22°C on Sat night). Wind will be generally light.

Days 3-6 Weather Summary Light rain (total 9mm), mostly falling on Sun morning. Warm (max 24°C on Sun afternoon, min 21°C on Mon night). Mainly fresh winds.

Thursday
19
Friday
20
Saturday
21
Sunday
22
Monday
23
Tuesday
24
Wednesday
25
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
1
2
2
2
1
2
2
2
2
2
1
0
0
1
1
1
1
1
3
1
2
Swell
Height Map
Wave Height (m) & direction (?)
1.4
N
1.2
N
1.1
N
1
N
1.3
N
1.4
N
1.3
NNE
1.4
NNE
1.6
NNE
0.9
WNW
1.3
N
1.8
N
2.1
NNE
2.2
NNE
2.5
NNE
3
NNE
3
NNE
3
NE
3
NE
3
NE
2.2
NNE
Period(s) (?)111110101211101110151110101112121211111010
Wave
Graph
(?)Metric surfscale
Energy kJ (?)4753322492004464413424694923723796699191176201324522662240819061616951
Wind
(km/h)
20
ESE
20
SE
15
SSE
15
S
20
SSW
15
S
10
SSW
25
SSW
20
S
20
SSW
15
SW
20
NW
25
NNE
30
NNE
25
NE
30
NE
30
NE
30
NE
25
NE
25
NE
20
NE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
offoffcross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
crossoncross-
on
crosscrosscrosscrosscrosscross-
off
crosscross
High Tide
/ height (m)
3:24PM
0.64
2:53AM
0.58
4:10PM
0.67
3:07AM
0.52
5:01PM
0.68
3:12AM
0.47
6:03PM
0.68
2:35AM
0.44
7:27PM
0.66
9:16PM
0.67
10:43PM
0.69
Low Tide
/ height (m)
8:58AM
0.12
9:19PM
0.26
9:18AM
0.09
10:09PM
0.32
9:42AM
0.07
11:10PM
0.39
10:09AM
0.06
12:59AM
0.44
10:41AM
0.07
11:21AM
0.10
12:25PM
0.15
Thursday
19
Friday
20
Saturday
21
Sunday
22
Monday
23
Tuesday
24
Wednesday
25
Sunrise6:37--6:35--6:35--6:33--6:33--6:31--6:31--
Sunset-6:42--6:43--6:43--6:43--6:44--6:44--6:44-
thunderstorm
thunderstorm
rain showers
thunderstorm
thunderstorm
mod rain
thunderstorm
mod rain
thunderstorm
thunderstorm
thunderstorm
thunderstorm
clear
part cloud
cloud
part cloud
clear
rain showers
clear
part cloud
part cloud
Rain (mm)
436129485422-----1---
Temp. °C242524252624232423232423222221222221222221
Feels °C (?)242525262625252423232424201917171717191919
  • 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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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 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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