Surf Forecasts:
Backdoor surf forecast from 24 Aug 2026:
- Most powerful swell: Monday 24 Aug, 2AM (local time) - 2ft (0.6m), 11s period, NW swell with 101 kJ wave energy.
Best Forecast Surf Conditions for Backdoor this week:
The most powerful waves expected at Backdoor in the next 16 days are 0.6m 11s and forecast to arrive on Monday (Aug 24) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 7s period and expected on Tuesday (Aug 25) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Mon 24th Aug) | 2ft (0.6m) 11s |
Table - best surf conditions forecast for Backdoor over the next 16 days.
The Lowdown
Alright, let's get into it. This is Rusty.
Right off the bat, I gotta be straight with you—this 16-day window is looking bleak. We’ve got a long, dry stretch of hardly any surf on offer, so don’t get your hopes up for any decent waves for a while.
The only spot on the map is Backdoor. It's a reef break, exposed to swell, and it’s looking for that optimum NW direction. The water temp is sitting at 81° with a 0.5° anomaly, so pretty average for this time of year.
For the first week, from Sunday the 23rd of August all the way through to Saturday the 30th, it’s a write-off. We’re talking tiny, knee-to-waist high junk, with swell heights barely hitting 2 ft and periods around 9-11 seconds. The combined energy is weak, sitting between 13 and 86, so there’s just no power behind it. The wind is a constant cross-off from the ENE at 15-19 mph, which keeps the surface clean, but there’s nothing to ride. It’s all “poor surf conditions” every single day.
There’s a brief flicker of hope on Monday the 31st of August. The swell bumps up to 5 ft from the NE, but look at that period—only 7 seconds. That’s short-period wind swell, all chop and no push. The combined energy hits 179, so it’s got some grunt, but the quality just isn’t there for a decent paddle. With those conditions and the reef setup, it honestly looks more interesting for kite surfing than for paddling out on a surfboard.
Then we crash again. From Tuesday the 1st of September right through to the end of the forecast on Monday the 7th of September, it’s back to flat or near-flat. Swell heights drop to 0.7 ft or nothing at all. There’s a little blip on the 7th with a 1 ft NW swell and a 12-second period, but with only 35 energy, it’s just not worth the paddle.
So yeah, it’s a tough run. The one standout, if you can even call it that, is the 31st of August morning at Backdoor if you’re desperate for something with a little push, but don’t expect any quality. Crowds are likely there, and with conditions like this, everyone will be scratching for a wave.
This is a blank run for the area. It happens.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Sun afternoon, min 25°C on Sun night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Wed afternoon, min 25°C on Wed night). Mainly fresh winds. | |||||||||||||||||||
Sun 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | ||||||||||||||
PM | 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) | WNW 10 | NW 11 | NW 11 | NW 10 | NW 9 | NW 10 | NW 9 | NW 9 | NW 10 | NW 10 | NW 10 | NW 9 | NW 9 | NW 9 | NW 9 | NW 9 | NW 9 | NW 9 | NW 9 | WNW 9 |
Wave Graph | ||||||||||||||||||||
68 | 101 | 55 | 48 | 21 | 23 | 23 | 22 | 27 | 27 | 34 | 22 | 22 | 21 | 22 | 22 | 13 | 13 | 13 | 8 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore 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 |
High Tide | 11:38PM0.32m | 1:41PM0.73m | 00:27AM0.35m | 2:03PM0.74m | 1:07AM0.39m | 2:24PM0.74m | 1:46AM0.43m | 2:44PM0.72m | 2:26AM0.48m | 3:02PM0.70m | 3:07AM0.51m | 3:19PM0.65m | 3:51AM0.55m | |||||||
Low Tide | 9:01PM0.30m | 5:49AM0.11m | 8:51PM0.29m | 6:29AM0.09m | 8:55PM0.28m | 7:06AM0.09m | 9:04PM0.26m | 7:41AM0.10m | 9:16PM0.24m | 8:16AM0.14m | 9:30PM0.21m | 8:53AM0.19m | 9:47PM0.18m | |||||||
— | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | |
6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 26 | 27 | 27 | 26 | 26 | 27 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 26 | 26 | 27 | 27 | 27 | 25 | 25 | 24 | 23 | 24 | 23 | 24 | 25 | 23 | 24 | 24 | 23 | 24 | 24 | 24 |
Swell 1 Height (m) Direction Period (s) | WNW 10 | NW 11 | NW 11 | NW 10 | NW 9 | NW 10 | NW 9 | NW 9 | NW 10 | NW 10 | NW 10 | NW 9 | NW 9 | NNE 7 | NNE 7 | NW 9 | E 12 | E 14 | E 13 | E 13 |
68 | 101 | 55 | 48 | 21 | 23 | 23 | 22 | 27 | 27 | 34 | 22 | 22 | 10 | 15 | 22 | 26 | 106 | 92 | 121 | |
Swell 2 Height (m) Direction Period (s) | SW 15 | SW 14 | SW 14 | SW 14 | SSW 13 | SSW 16 | SSW 12 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 16 | NNE 8 | NW 9 | NW 9 | E 13 | NW 9 | NW 9 | E 11 | SW 17 |
54 | 52 | 50 | 29 | 32 | 25 | 29 | 41 | 41 | 39 | 17 | 48 | 12 | 21 | 22 | 32 | 13 | 13 | 39 | 70 | |
Swell 3 Height (m) Direction Period (s) | WNW 14 | SW 9 | SW 18 | S 13 | SSW 17 | SSW 12 | SSW 16 | SSW 12 | W 11 | S 18 | SSW 16 | N 8 | SSW 13 | SSW 12 | S 14 | SSW 14 | E 15 | SSW 18 | NW 9 | WNW 9 |
18 | 3 | 12 | 3 | 27 | 15 | 25 | 13 | 9 | 25 | 26 | 5 | 16 | 13 | 37 | 18 | 40 | 31 | 13 | 8 | |
Wind waves Height (m) Direction Period (s) | ENE 6 | E 7 | E 7 | E 7 | E 7 | E 7 | E 7 | E 7 | E 7 | ENE 7 | ENE 7 | E 6 | E 7 | E 6 | E 7 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
252 | 316 | 284 | 274 | 282 | 355 | 371 | 286 | 270 | 198 | 180 | 143 | 126 | 143 | 148 | 201 | 232 | 277 | 254 | 276 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 166 | 24 | 24 | 2 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 28 | 28 | 28 | 26 | 150 | 24 | 24 | 24 | 24 |
Best forecast wave conditions in Oahu | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.











