Surf Forecasts:
Backdoor surf forecast from 31 Aug 2026:
- Most powerful swell: Saturday 5 Sep, 11AM (local time) - 1.5ft (0.4m), 11s period, NNE swell with 37 kJ wave energy.
Best Forecast Surf Conditions for Backdoor this week:
The most powerful waves expected at Backdoor in the next 16 days are 0.4m 11s and forecast to arrive on Saturday (Sep 05) at 11AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 8s period and expected on Thursday (Sep 03) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Sat 5th Sep) | 1.5ft (0.4m) 11s |
Table - best surf conditions forecast for Backdoor over the next 16 days.
The Lowdown
Hey, Rusty here. Let’s break it down for the North Shore. We’ve got a 16-day forecast, but it’s a dry spell from the jump, and it never really opens up.
Starting Sunday the 30th of August, Backdoor (Oahu) has nothing for us. A tiny 0.7ft west swell with an 11-second period, and a 30 km/h cross-off wind. Water temp is 80°, dead average for this time of year. The combined swell energy is a feeble 9 (weak energy). It’s a hard pass.
Monday and Tuesday stay flat to knee-high. Winds are steady from the ENE around 15-18 mph, keeping conditions clean but the swell is missing. By Saturday the 5th of September, there’s a hint of 1ft from the NNE, short period 11 seconds, and energy at 37 (weak energy). Still not enough to surf.
The whole second week is more of the same. The most promising moment is Wednesday morning the 9th of September. Glassy conditions, a 1ft SW groundswell with a long 14-second period, and a light 5 km/h NNE breeze. Combined energy is 45 (weak energy). Looks beautiful, but too small to ride.
Thursday the 10th gives us a 1ft SW groundswell with a very long 16-second period, combined energy of 41 (weak energy), and clean offshore wind. That long period will make it clean but straight at a beach break. Still too small.
The best combined energy we see all run is Monday the 14th of September: 1ft from the west, 13-second period, energy hitting 95 (weak energy). Still poor surf conditions. Sixteen days of nothing above 1ft, nothing with real energy. It’s a desert. For paddle surfing, it’s a total bust. This stretch looks better suited for kite surfing.
Forecasts can shift, but right now it’s a hard no. Rusty.
Short Range ForecastSome drizzle, heaviest during Tue afternoon. Warm (max 27°C on Sun afternoon, min 25°C on Sun night). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Thu night. Warm (max 27°C on Wed afternoon, min 25°C on Wed night). Mainly strong winds. | |||||||||||||||||||
Sun 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | ||||||||||||||
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) | W 11 | W 11 | W 12 | ENE 8 | W 12 | W 12 | W 12 | ENE 8 | ENE 8 | ENE 8 | SW 13 | SW 13 | SW 13 | SW 13 | ENE 8 | SW 13 | NNE 11 | NNE 11 | E 8 | SW 8 |
Wave Graph | ||||||||||||||||||||
9 | 2 | 3 | 0 | 12 | 11 | 11 | 0 | 0 | 0 | 7 | 7 | 7 | 6 | 0 | 7 | 15 | 37 | 0 | 33 | |
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 | 3:33PM0.60m | 4:40AM0.57m | 3:43PM0.55m | 5:40AM0.58m | 3:43PM0.51m | 7:00AM0.59m | 2:52PM0.48m | 9:00AM0.61m | 10:44AM0.66m | 11:43AM0.72m | ||||||||||
Low Tide | 10:07PM0.15m | 10:15AM0.33m | 10:30PM0.13m | 11:10AM0.41m | 10:59PM0.11m | 1:04PM0.47m | 11:37PM0.11m | 00:34AM0.12m | 2:10AM0.13m | 3:55AM0.12m | ||||||||||
— | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | |
6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:45 | — | |
mm | — | — | — | — | — | — | 1 | — | — | — | — | — | — | 1 | — | — | — | 1 | 2 | — |
Temp °C | 27 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 27 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 26 | 27 | 26 |
Feels °C | 25 | 24 | 24 | 24 | 23 | 25 | 25 | 23 | 25 | 26 | 24 | 23 | 23 | 21 | 21 | 23 | 22 | 25 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | ENE 11 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SSW 14 | SSW 17 | E 14 | E 14 | E 13 | S 15 | E 12 | SSE 12 | E 13 | E 13 | S 13 | SSW 12 | SSW 12 | SW 8 |
40 | 57 | 55 | 52 | 53 | 51 | 40 | 54 | 32 | 66 | 125 | 17 | 73 | 14 | 123 | 225 | 30 | 47 | 77 | 33 | |
Swell 2 Height (m) Direction Period (s) | SW 15 | S 11 | S 11 | S 11 | W 12 | SSW 18 | W 12 | SSW 14 | SSW 16 | ESE 9 | S 15 | SW 13 | SSW 14 | S 14 | SSE 11 | SSE 10 | NNE 11 | NNE 11 | SSW 17 | NNE 9 |
60 | 10 | 9 | 9 | 12 | 31 | 11 | 19 | 51 | 17 | 39 | 7 | 20 | 15 | 12 | 10 | 12 | 37 | 30 | 17 | |
Swell 3 Height (m) Direction Period (s) | W 11 | W 11 | W 12 | SSW 18 | S 20 | W 12 | SSW 18 | ESE 11 | SSW 14 | S 16 | SW 13 | NW 10 | SW 13 | SW 13 | S 13 | SW 13 | SW 19 | SSW 17 | S 12 | SSW 16 |
9 | 2 | 3 | 31 | 7 | 11 | 31 | 12 | 19 | 45 | 7 | 4 | 7 | 6 | 14 | 7 | 15 | 29 | 26 | 25 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 8 | E 8 | E 13 |
316 | 348 | 408 | 400 | 439 | 463 | 487 | 487 | 464 | 456 | 555 | 828 | 749 | 1145 | 1081 | 871 | 953 | 1041 | 994 | 2092 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 24 | 24 | 24 | 24 | 24 | 24 | 165 | 26 | 26 | 26 | 26 | 169 | 168 | 168 | 167 | 165 | 165 | 24 | 26 | 2 |
Best forecast wave conditions in Oahu | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
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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.











