
Surf Forecasts:
Backdoor surf forecast from 7 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 8PM (local time) - 3.5ft (1.1m), 8s period, W swell with cross-offshore winds.
- Most powerful swell: Tuesday 8 Sep, 2AM (local time) - 10ft (3.0m), 14s period, SW swell with 3,419 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 8PM (local time) - 3.5ft (1.1m), 8s period with W swell.
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 Tuesday (Sep 08) at 8PM. The primary swell is predicted to be 1.1m and 8s 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 3.0m 14s and forecast to arrive on Tuesday (Sep 08) at 2AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 7s period and expected on Monday (Sep 07) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Tue 8th Sep) | 3.5ft (1.1m) 8s |
| Best Surf | 8PM (Tue 8th Sep) | 3.5ft (1.1m) 8s |
| Most Powerful | 2AM (Tue 8th Sep) | 10ft (3.0m) 14s |
Table - best surf conditions forecast for Backdoor over the next 16 days.
The Lowdown
Alright, Rusty here, and let's have a look at what's on offer. Honestly, looking over the next 16 days, it's a pretty lean run for Backdoor. We've got a real flat spell to start, so don't bother waxing up just yet. The first proper mention of anything worth a look doesn't come around until Tuesday, September 15th, and even then, it's a bit of a wildcard.
The overall pattern is one of small, weak, and mostly messy conditions. The wind is a constant problem, blowing cross-off from the east pretty much every day, which isn't doing us any favors. It's going to be a test of patience.
Now, the one small window of interest is on Tuesday, September 15th. We see a pulse of long-period groundswell from the southwest, with a period hitting 20 seconds. That's a seriously long period, the kind that wraps around and finds its way into bays. The combined swell energy reads at (257) which is moderate, but that long period means there's some grunt in the water. The swell height is only a tiny 1.6 ft, so don't expect anything with real size, but this is the kind of day where Backdoor can suddenly have a bit of shape. The wind is light cross from the northeast at 6 mph, which is almost glassy. If you're going to paddle out all forecast period, this is the time. Keep your expectations in check for size, but the conditions will be far cleaner than anything else we've seen.
For the rest of the days after that, it's back to small, weak, and choppy with the wind picking up again. From the 16th on through the 22nd, we're looking at persistent small swells from the west and northwest, but the wind is up between 9 and 12 mph, so it'll be a bumpy mess. The water temperature is about average for this time of year, so nothing unusual there.
To be straight with you, there's no standout session here. The best of a bad bunch is that Tuesday morning the 15th, purely for the glassy chance and that long period energy. Don't expect much else.
Short Range ForecastHeavy rain (total 22mm), heaviest during Sun night. Warm (max 29°C on Tue afternoon, min 25°C on Sun night). Winds decreasing (fresh winds from the E on Mon morning, calm by Tue night). | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Wed night. Warm (max 26°C on Wed night, min 24°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map | |||||||||||||||||||
Wave Height (m) Direction Period (s) | NW 16 | SW 12 | SW 14 | SW 14 | WSW 11 | W 9 | W 8 | WNW 8 | NW 10 | NW 10 | NW 7 | NW 7 | SW 11 | NNE 8 | NNE 8 | SW 15 | NNE 9 | NNE 9 | NNE 9 |
Wave Graph | |||||||||||||||||||
10 | 216 | 564 | 3419 | 1113 | 341 | 95 | 43 | 157 | 31 | 14 | 8 | 41 | 35 | 50 | 109 | 96 | 96 | 94 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | 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 | cross-off | cross-off | cross-off |
High Tide | 11:16PM0.31m | 1:01PM0.77m | 00:22AM0.37m | 1:32PM0.77m | 1:11AM0.44m | 1:59PM0.75m | 1:56AM0.50m | 2:23PM0.71m | 2:38AM0.55m | 2:44PM0.65m | 3:20AM0.59m | 3:00PM0.59m | 4:01AM0.62m | ||||||
Low Tide | 8:18PM0.28m | 5:11AM0.10m | 8:11PM0.26m | 6:09AM0.10m | 8:20PM0.24m | 6:59AM0.11m | 8:34PM0.21m | 7:44AM0.14m | 8:50PM0.18m | 8:28AM0.19m | 9:07PM0.15m | 9:10AM0.25m | 9:24PM0.13m | ||||||
— | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | |
6:44 | — | 6:43 | — | — | 6:42 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — | |
mm | 12 | 2 | 1 | 3 | 1 | — | — | — | 3 | 3 | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 27 | 27 | 28 | 29 | 27 | 28 | 28 | 26 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 |
Feels °C | 25 | 24 | 25 | 26 | 28 | 30 | 30 | 31 | 31 | 28 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SW 12 | SW 14 | SW 14 | WSW 11 | ENE 11 | ENE 10 | ENE 9 | NW 10 | E 13 | E 12 | E 12 | E 12 | E 11 | NNE 8 | ENE 11 | NNE 9 | NNE 9 | NNE 9 |
347 | 216 | 564 | 3419 | 1113 | 839 | 480 | 227 | 157 | 158 | 104 | 103 | 96 | 123 | 50 | 346 | 96 | 96 | 94 | |
Swell 2 Height (m) Direction Period (s) | SSW 18 | SSW 17 | NW 13 | NW 12 | E 11 | W 9 | W 8 | E 13 | E 13 | NW 8 | NW 7 | SW 18 | SW 11 | NNE 8 | SW 15 | SW 15 | SSW 14 | SW 13 | SW 13 |
63 | 57 | 28 | 37 | 1104 | 341 | 95 | 168 | 168 | 31 | 14 | 80 | 41 | 35 | 57 | 109 | 81 | 45 | 27 | |
Swell 3 Height (m) Direction Period (s) | NW 16 | SSE 8 | SSW 17 | NW 12 | NW 12 | SSW 9 | E 14 | WNW 8 | SSW 13 | NW 10 | SW 16 | NW 7 | SW 16 | SW 16 | SW 9 | SW 9 | SW 8 | SW 16 | SSW 16 |
10 | 6 | 27 | 37 | 35 | 135 | 179 | 43 | 34 | 25 | 68 | 8 | 68 | 65 | 31 | 12 | 11 | 39 | 24 | |
Wind waves Height (m) Direction Period (s) | E 12 | E 7 | E 7 | E 12 | SSE 7 | S 9 | S 8 | — | ENE 8 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 11 | — | E 10 | E 10 | ENE 10 |
1699 | 695 | 859 | 2049 | 135 | 225 | 46 | — | 273 | 251 | 355 | 254 | 162 | 125 | 356 | — | 240 | 240 | 240 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 11 | 292 | 98 | 113 | 155 | 12 | 0 | 0 | 0 | 2 | 24 | 24 | 24 | 24 | 2 | 2 | 2 | 0 | 0 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.










